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Generate vertex tangents using mikktspace (#3872)
# Objective Models can be produced that do not have vertex tangents but do have normal map textures. The tangents can be generated. There is a way that the vertex tangents can be generated to be exactly invertible to avoid introducing error when recreating the normals in the fragment shader. ## Solution - After attempts to get https://github.com/gltf-rs/mikktspace to integrate simple glam changes and version bumps, and releases of that crate taking weeks / not being made (no offense intended to the authors/maintainers, bevy just has its own timelines and needs to take care of) it was decided to fork that repository. The following steps were taken: - mikktspace was forked to https://github.com/bevyengine/mikktspace in order to preserve the repository's history in case the original is ever taken down - The README in that repo was edited to add a note stating from where the repository was forked and explaining why - The repo was locked for changes as its only purpose is historical - The repo was integrated into the bevy repo using `git subtree add --prefix crates/bevy_mikktspace git@github.com:bevyengine/mikktspace.git master` - In `bevy_mikktspace`: - The travis configuration was removed - `cargo fmt` was run - The `Cargo.toml` was conformed to bevy's (just adding bevy to the keywords, changing the homepage and repository, changing the version to 0.7.0-dev - importantly the license is exactly the same) - Remove the features, remove `nalgebra` entirely, only use `glam`, suppress clippy. - This was necessary because our CI runs clippy with `--all-features` and the `nalgebra` and `glam` features are mutually exclusive, plus I don't want to modify this highly numerically-sensitive code just to appease clippy and diverge even more from upstream. - Rebase https://github.com/bevyengine/bevy/pull/1795 - @jakobhellermann said it was fine to copy and paste but it ended up being almost exactly the same with just a couple of adjustments when validating correctness so I decided to actually rebase it and then build on top of it. - Use the exact same fragment shader code to ensure correct normal mapping. - Tested with both https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/NormalTangentMirrorTest which has vertex tangents and https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/NormalTangentTest which requires vertex tangent generation Co-authored-by: alteous <alteous@outlook.com>
This commit is contained in:
Robert Swain
parent
27c321e33f
commit
bdef86ea6e
14 changed files with 3582 additions and 10 deletions
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@ -62,6 +62,8 @@ pub enum GltfError {
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AssetIoError(#[from] AssetIoError),
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#[error("Missing sampler for animation {0}")]
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MissingAnimationSampler(usize),
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#[error("failed to generate tangents: {0}")]
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GenerateTangentsError(#[from] bevy_render::mesh::GenerateTangentsError),
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}
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/// Loads glTF files with all of their data as their corresponding bevy representations.
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@ -250,13 +252,6 @@ async fn load_gltf<'a, 'b>(
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mesh.insert_attribute(Mesh::ATTRIBUTE_NORMAL, vertex_attribute);
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}
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if let Some(vertex_attribute) = reader
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.read_tangents()
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.map(|v| VertexAttributeValues::Float32x4(v.collect()))
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{
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mesh.insert_attribute(Mesh::ATTRIBUTE_TANGENT, vertex_attribute);
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}
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if let Some(vertex_attribute) = reader
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.read_tex_coords(0)
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.map(|v| VertexAttributeValues::Float32x2(v.into_f32().collect()))
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@ -309,6 +304,25 @@ async fn load_gltf<'a, 'b>(
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}
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}
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if let Some(vertex_attribute) = reader
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.read_tangents()
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.map(|v| VertexAttributeValues::Float32x4(v.collect()))
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{
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mesh.insert_attribute(Mesh::ATTRIBUTE_TANGENT, vertex_attribute);
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} else if mesh.attribute(Mesh::ATTRIBUTE_NORMAL).is_some()
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&& primitive.material().normal_texture().is_some()
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{
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bevy_log::debug!(
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"Missing vertex tangents, computing them using the mikktspace algorithm"
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);
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if let Err(err) = mesh.generate_tangents() {
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bevy_log::warn!(
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"Failed to generate vertex tangents using the mikktspace algorithm: {:?}",
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err
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);
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}
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}
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let mesh = load_context.set_labeled_asset(&primitive_label, LoadedAsset::new(mesh));
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primitives.push(super::GltfPrimitive {
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mesh,
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@ -318,6 +332,7 @@ async fn load_gltf<'a, 'b>(
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.and_then(|i| materials.get(i).cloned()),
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});
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}
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let handle = load_context.set_labeled_asset(
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&mesh_label(&mesh),
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LoadedAsset::new(super::GltfMesh { primitives }),
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17
crates/bevy_mikktspace/Cargo.toml
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17
crates/bevy_mikktspace/Cargo.toml
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@ -0,0 +1,17 @@
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[package]
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name = "bevy_mikktspace"
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version = "0.8.0-dev"
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edition = "2021"
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authors = ["Benjamin Wasty <benny.wasty@gmail.com>", "David Harvey-Macaulay <alteous@outlook.com>", "Layl Bongers <LaylConway@users.noreply.github.com>"]
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description = "Mikkelsen tangent space algorithm"
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documentation = "https://docs.rs/bevy"
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homepage = "https://bevyengine.org"
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repository = "https://github.com/bevyengine/bevy"
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license = "Zlib AND (MIT OR Apache-2.0)"
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keywords = ["bevy", "3D", "graphics", "algorithm", "tangent"]
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[dependencies]
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glam = "0.20.0"
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[[example]]
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name = "generate"
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176
crates/bevy_mikktspace/LICENSE-APACHE
Normal file
176
crates/bevy_mikktspace/LICENSE-APACHE
Normal file
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@ -0,0 +1,176 @@
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|||
Apache License
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Version 2.0, January 2004
|
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|
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26
crates/bevy_mikktspace/LICENSE-MIT
Normal file
26
crates/bevy_mikktspace/LICENSE-MIT
Normal file
|
|
@ -0,0 +1,26 @@
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|||
Copyright (c) 2017 The mikktspace Library Developers
|
||||
|
||||
Permission is hereby granted, free of charge, to any
|
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person obtaining a copy of this software and associated
|
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documentation files (the "Software"), to deal in the
|
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Software without restriction, including without
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limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software
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is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice
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shall be included in all copies or substantial portions
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of the Software.
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|
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
|
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|
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35
crates/bevy_mikktspace/README.md
Normal file
35
crates/bevy_mikktspace/README.md
Normal file
|
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@ -0,0 +1,35 @@
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# bevy_mikktspace
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This is a fork of [https://github.com/gltf-rs/mikktspace](https://github.com/gltf-rs/mikktspace), which in turn is a port of the Mikkelsen Tangent Space Algorithm reference implementation to Rust. It has been forked for use in the bevy game engine to be able to update maths crate dependencies in lock-step with bevy releases. It is vendored in the bevy repository itself as [crates/bevy_mikktspace](https://github.com/bevyengine/bevy/tree/main/crates/bevy_mikktspace).
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Port of the [Mikkelsen Tangent Space Algorithm](https://en.blender.org/index.php/Dev:Shading/Tangent_Space_Normal_Maps) reference implementation.
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Requires at least Rust 1.52.1.
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## Examples
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### generate
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Demonstrates generating tangents for a cube with 4 triangular faces per side.
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```sh
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cargo run --example generate
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```
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## License agreement
|
||||
|
||||
Licensed under either of
|
||||
|
||||
* Apache License, Version 2.0
|
||||
([LICENSE-APACHE](LICENSE-APACHE) or [http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0))
|
||||
* MIT license
|
||||
([LICENSE-MIT](LICENSE-MIT) or [http://opensource.org/licenses/MIT](http://opensource.org/licenses/MIT))
|
||||
|
||||
at your option. AND parts of the code are licensed under:
|
||||
|
||||
* Zlib license
|
||||
[https://opensource.org/licenses/Zlib](https://opensource.org/licenses/Zlib)
|
||||
|
||||
Unless you explicitly state otherwise, any contribution intentionally submitted
|
||||
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
|
||||
dual licensed as above, without any additional terms or conditions.
|
||||
114
crates/bevy_mikktspace/examples/cube.obj
Normal file
114
crates/bevy_mikktspace/examples/cube.obj
Normal file
|
|
@ -0,0 +1,114 @@
|
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v 0.5 -0.5 0.5
|
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v 0.5 -0.5 -0.5
|
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v 0.5 0.5 -0.5
|
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v 0.5 0.5 0.5
|
||||
v 0.5 0 0
|
||||
v -0.5 0.5 0.5
|
||||
v -0.5 0.5 -0.5
|
||||
v -0.5 -0.5 -0.5
|
||||
v -0.5 -0.5 0.5
|
||||
v -0.5 0 0
|
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v 0.5 0.5 0.5
|
||||
v 0.5 0.5 -0.5
|
||||
v -0.5 0.5 -0.5
|
||||
v -0.5 0.5 0.5
|
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v 0 0.5 0
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||||
v -0.5 -0.5 0.5
|
||||
v -0.5 -0.5 -0.5
|
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v 0.5 -0.5 -0.5
|
||||
v 0.5 -0.5 0.5
|
||||
v 0 -0.5 0
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v -0.5 0.5 0.5
|
||||
v -0.5 -0.5 0.5
|
||||
v 0.5 -0.5 0.5
|
||||
v 0.5 0.5 0.5
|
||||
v 0 0 0.5
|
||||
v 0.5 0.5 -0.5
|
||||
v 0.5 -0.5 -0.5
|
||||
v -0.5 -0.5 -0.5
|
||||
v -0.5 0.5 -0.5
|
||||
v 0 0 -0.5
|
||||
vn 0.57735026 -0.57735026 0.57735026
|
||||
vn 0.57735026 -0.57735026 -0.57735026
|
||||
vn 0.57735026 0.57735026 -0.57735026
|
||||
vn 0.57735026 0.57735026 0.57735026
|
||||
vn 1 0 0
|
||||
vn -0.57735026 0.57735026 0.57735026
|
||||
vn -0.57735026 0.57735026 -0.57735026
|
||||
vn -0.57735026 -0.57735026 -0.57735026
|
||||
vn -0.57735026 -0.57735026 0.57735026
|
||||
vn -1 0 0
|
||||
vn 0.57735026 0.57735026 0.57735026
|
||||
vn 0.57735026 0.57735026 -0.57735026
|
||||
vn -0.57735026 0.57735026 -0.57735026
|
||||
vn -0.57735026 0.57735026 0.57735026
|
||||
vn 0 1 0
|
||||
vn -0.57735026 -0.57735026 0.57735026
|
||||
vn -0.57735026 -0.57735026 -0.57735026
|
||||
vn 0.57735026 -0.57735026 -0.57735026
|
||||
vn 0.57735026 -0.57735026 0.57735026
|
||||
vn 0 -1 0
|
||||
vn -0.57735026 0.57735026 0.57735026
|
||||
vn -0.57735026 -0.57735026 0.57735026
|
||||
vn 0.57735026 -0.57735026 0.57735026
|
||||
vn 0.57735026 0.57735026 0.57735026
|
||||
vn 0 0 1
|
||||
vn 0.57735026 0.57735026 -0.57735026
|
||||
vn 0.57735026 -0.57735026 -0.57735026
|
||||
vn -0.57735026 -0.57735026 -0.57735026
|
||||
vn -0.57735026 0.57735026 -0.57735026
|
||||
vn 0 0 -1
|
||||
vt 0 0
|
||||
vt 0 1
|
||||
vt 1 1
|
||||
vt 1 0
|
||||
vt 0.5 0.5
|
||||
vt 1 0
|
||||
vt 1 1
|
||||
vt 0 1
|
||||
vt 0 0
|
||||
vt 0.5 0.5
|
||||
vt 0 0
|
||||
vt 0 1
|
||||
vt 0 1
|
||||
vt 0 0
|
||||
vt 0 0.5
|
||||
vt 0 0
|
||||
vt 0 1
|
||||
vt 0 1
|
||||
vt 0 0
|
||||
vt 0 0.5
|
||||
vt 0 0
|
||||
vt 0 1
|
||||
vt 1 1
|
||||
vt 1 0
|
||||
vt 0.5 0.5
|
||||
vt 1 0
|
||||
vt 1 1
|
||||
vt 0 1
|
||||
vt 0 0
|
||||
vt 0.5 0.5
|
||||
f 1/1/1 2/2/2 5/5/5
|
||||
f 2/2/2 3/3/3 5/5/5
|
||||
f 3/3/3 4/4/4 5/5/5
|
||||
f 4/4/4 1/1/1 5/5/5
|
||||
f 6/6/6 7/7/7 10/10/10
|
||||
f 7/7/7 8/8/8 10/10/10
|
||||
f 8/8/8 9/9/9 10/10/10
|
||||
f 9/9/9 6/6/6 10/10/10
|
||||
f 11/11/11 12/12/12 15/15/15
|
||||
f 12/12/12 13/13/13 15/15/15
|
||||
f 13/13/13 14/14/14 15/15/15
|
||||
f 14/14/14 11/11/11 15/15/15
|
||||
f 16/16/16 17/17/17 20/20/20
|
||||
f 17/17/17 18/18/18 20/20/20
|
||||
f 18/18/18 19/19/19 20/20/20
|
||||
f 19/19/19 16/16/16 20/20/20
|
||||
f 21/21/21 22/22/22 25/25/25
|
||||
f 22/22/22 23/23/23 25/25/25
|
||||
f 23/23/23 24/24/24 25/25/25
|
||||
f 24/24/24 21/21/21 25/25/25
|
||||
f 26/26/26 27/27/27 30/30/30
|
||||
f 27/27/27 28/28/28 30/30/30
|
||||
f 28/28/28 29/29/29 30/30/30
|
||||
f 29/29/29 26/26/26 30/30/30
|
||||
259
crates/bevy_mikktspace/examples/generate.rs
Normal file
259
crates/bevy_mikktspace/examples/generate.rs
Normal file
|
|
@ -0,0 +1,259 @@
|
|||
#![allow(clippy::bool_assert_comparison, clippy::useless_conversion)]
|
||||
|
||||
use glam::{Vec2, Vec3};
|
||||
|
||||
pub type Face = [u32; 3];
|
||||
|
||||
#[derive(Debug)]
|
||||
struct Vertex {
|
||||
position: Vec3,
|
||||
normal: Vec3,
|
||||
tex_coord: Vec2,
|
||||
}
|
||||
|
||||
struct Mesh {
|
||||
faces: Vec<Face>,
|
||||
vertices: Vec<Vertex>,
|
||||
}
|
||||
|
||||
fn vertex(mesh: &Mesh, face: usize, vert: usize) -> &Vertex {
|
||||
let vs: &[u32; 3] = &mesh.faces[face];
|
||||
&mesh.vertices[vs[vert] as usize]
|
||||
}
|
||||
|
||||
impl bevy_mikktspace::Geometry for Mesh {
|
||||
fn num_faces(&self) -> usize {
|
||||
self.faces.len()
|
||||
}
|
||||
|
||||
fn num_vertices_of_face(&self, _face: usize) -> usize {
|
||||
3
|
||||
}
|
||||
|
||||
fn position(&self, face: usize, vert: usize) -> [f32; 3] {
|
||||
vertex(self, face, vert).position.into()
|
||||
}
|
||||
|
||||
fn normal(&self, face: usize, vert: usize) -> [f32; 3] {
|
||||
vertex(self, face, vert).normal.into()
|
||||
}
|
||||
|
||||
fn tex_coord(&self, face: usize, vert: usize) -> [f32; 2] {
|
||||
vertex(self, face, vert).tex_coord.into()
|
||||
}
|
||||
|
||||
fn set_tangent_encoded(&mut self, tangent: [f32; 4], face: usize, vert: usize) {
|
||||
println!(
|
||||
"{face}-{vert}: v: {v:?}, vn: {vn:?}, vt: {vt:?}, vx: {vx:?}",
|
||||
face = face,
|
||||
vert = vert,
|
||||
v = vertex(self, face, vert).position,
|
||||
vn = vertex(self, face, vert).normal,
|
||||
vt = vertex(self, face, vert).tex_coord,
|
||||
vx = tangent,
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
fn make_cube() -> Mesh {
|
||||
struct ControlPoint {
|
||||
uv: [f32; 2],
|
||||
dir: [f32; 3],
|
||||
}
|
||||
let mut faces = Vec::new();
|
||||
let mut ctl_pts = Vec::new();
|
||||
let mut vertices = Vec::new();
|
||||
|
||||
// +x plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [1.0, -1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [1.0, -1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 1.0],
|
||||
dir: [1.0, 1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 0.0],
|
||||
dir: [1.0, 1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.5, 0.5],
|
||||
dir: [1.0, 0.0, 0.0],
|
||||
});
|
||||
}
|
||||
|
||||
// -x plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 0.0],
|
||||
dir: [-1.0, 1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 1.0],
|
||||
dir: [-1.0, 1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [-1.0, -1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [-1.0, -1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.5, 0.5],
|
||||
dir: [-1.0, 0.0, 0.0],
|
||||
});
|
||||
}
|
||||
|
||||
// +y plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [1.0, 1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [1.0, 1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [-1.0, 1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [-1.0, 1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.5],
|
||||
dir: [0.0, 1.0, 0.0],
|
||||
});
|
||||
}
|
||||
|
||||
// -y plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [-1.0, -1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [-1.0, -1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [1.0, -1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [1.0, -1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.5],
|
||||
dir: [0.0, -1.0, 0.0],
|
||||
});
|
||||
}
|
||||
|
||||
// +z plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [-1.0, 1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [-1.0, -1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 1.0],
|
||||
dir: [1.0, -1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 0.0],
|
||||
dir: [1.0, 1.0, 1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.5, 0.5],
|
||||
dir: [0.0, 0.0, 1.0],
|
||||
});
|
||||
}
|
||||
|
||||
// -z plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 0.0],
|
||||
dir: [1.0, 1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [1.0, 1.0],
|
||||
dir: [1.0, -1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 1.0],
|
||||
dir: [-1.0, -1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.0, 0.0],
|
||||
dir: [-1.0, 1.0, -1.0],
|
||||
});
|
||||
ctl_pts.push(ControlPoint {
|
||||
uv: [0.5, 0.5],
|
||||
dir: [0.0, 0.0, -1.0],
|
||||
});
|
||||
}
|
||||
|
||||
for pt in ctl_pts {
|
||||
let p: Vec3 = pt.dir.into();
|
||||
let n: Vec3 = p.normalize();
|
||||
let t: Vec2 = pt.uv.into();
|
||||
vertices.push(Vertex {
|
||||
position: (p / 2.0).into(),
|
||||
normal: n.into(),
|
||||
tex_coord: t.into(),
|
||||
});
|
||||
}
|
||||
|
||||
Mesh { faces, vertices }
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let mut cube = make_cube();
|
||||
let ret = bevy_mikktspace::generate_tangents(&mut cube);
|
||||
assert_eq!(true, ret);
|
||||
}
|
||||
1809
crates/bevy_mikktspace/src/generated.rs
Normal file
1809
crates/bevy_mikktspace/src/generated.rs
Normal file
File diff suppressed because it is too large
Load diff
85
crates/bevy_mikktspace/src/lib.rs
Normal file
85
crates/bevy_mikktspace/src/lib.rs
Normal file
|
|
@ -0,0 +1,85 @@
|
|||
#![allow(clippy::all)]
|
||||
|
||||
use glam::{Vec2, Vec3};
|
||||
|
||||
mod generated;
|
||||
|
||||
/// The interface by which mikktspace interacts with your geometry.
|
||||
pub trait Geometry {
|
||||
/// Returns the number of faces.
|
||||
fn num_faces(&self) -> usize;
|
||||
|
||||
/// Returns the number of vertices of a face.
|
||||
fn num_vertices_of_face(&self, face: usize) -> usize;
|
||||
|
||||
/// Returns the position of a vertex.
|
||||
fn position(&self, face: usize, vert: usize) -> [f32; 3];
|
||||
|
||||
/// Returns the normal of a vertex.
|
||||
fn normal(&self, face: usize, vert: usize) -> [f32; 3];
|
||||
|
||||
/// Returns the texture coordinate of a vertex.
|
||||
fn tex_coord(&self, face: usize, vert: usize) -> [f32; 2];
|
||||
|
||||
/// Sets the generated tangent for a vertex.
|
||||
/// Leave this function unimplemented if you are implementing
|
||||
/// `set_tangent_encoded`.
|
||||
fn set_tangent(
|
||||
&mut self,
|
||||
tangent: [f32; 3],
|
||||
_bi_tangent: [f32; 3],
|
||||
_f_mag_s: f32,
|
||||
_f_mag_t: f32,
|
||||
bi_tangent_preserves_orientation: bool,
|
||||
face: usize,
|
||||
vert: usize,
|
||||
) {
|
||||
let sign = if bi_tangent_preserves_orientation {
|
||||
1.0
|
||||
} else {
|
||||
-1.0
|
||||
};
|
||||
self.set_tangent_encoded([tangent[0], tangent[1], tangent[2], sign], face, vert);
|
||||
}
|
||||
|
||||
/// Sets the generated tangent for a vertex with its bi-tangent encoded as the 'W' (4th)
|
||||
/// component in the tangent. The 'W' component marks if the bi-tangent is flipped. This
|
||||
/// is called by the default implementation of `set_tangent`; therefore, this function will
|
||||
/// not be called by the crate unless `set_tangent` is unimplemented.
|
||||
fn set_tangent_encoded(&mut self, _tangent: [f32; 4], _face: usize, _vert: usize) {}
|
||||
}
|
||||
|
||||
/// Generates tangents for the input geometry.
|
||||
///
|
||||
/// # Errors
|
||||
///
|
||||
/// Returns `false` if the geometry is unsuitable for tangent generation including,
|
||||
/// but not limited to, lack of vertices.
|
||||
pub fn generate_tangents<I: Geometry>(geometry: &mut I) -> bool {
|
||||
unsafe { generated::genTangSpace(geometry, 180.0) }
|
||||
}
|
||||
|
||||
fn get_position<I: Geometry>(geometry: &mut I, index: usize) -> Vec3 {
|
||||
let (face, vert) = index_to_face_vert(index);
|
||||
geometry.position(face, vert).into()
|
||||
}
|
||||
|
||||
fn get_tex_coord<I: Geometry>(geometry: &mut I, index: usize) -> Vec3 {
|
||||
let (face, vert) = index_to_face_vert(index);
|
||||
let tex_coord: Vec2 = geometry.tex_coord(face, vert).into();
|
||||
let val = tex_coord.extend(1.0);
|
||||
val
|
||||
}
|
||||
|
||||
fn get_normal<I: Geometry>(geometry: &mut I, index: usize) -> Vec3 {
|
||||
let (face, vert) = index_to_face_vert(index);
|
||||
geometry.normal(face, vert).into()
|
||||
}
|
||||
|
||||
fn index_to_face_vert(index: usize) -> (usize, usize) {
|
||||
(index >> 2, index & 0x3)
|
||||
}
|
||||
|
||||
fn face_vert_to_index(face: usize, vert: usize) -> usize {
|
||||
face << 2 | vert & 0x3
|
||||
}
|
||||
889
crates/bevy_mikktspace/tests/regression_test.rs
Normal file
889
crates/bevy_mikktspace/tests/regression_test.rs
Normal file
|
|
@ -0,0 +1,889 @@
|
|||
#![allow(
|
||||
clippy::bool_assert_comparison,
|
||||
clippy::useless_conversion,
|
||||
clippy::redundant_else,
|
||||
clippy::match_same_arms,
|
||||
clippy::semicolon_if_nothing_returned,
|
||||
clippy::explicit_iter_loop,
|
||||
clippy::map_flatten
|
||||
)]
|
||||
|
||||
use bevy_mikktspace::{generate_tangents, Geometry};
|
||||
use glam::{Vec2, Vec3};
|
||||
|
||||
pub type Face = [u32; 3];
|
||||
|
||||
#[derive(Debug)]
|
||||
struct Vertex {
|
||||
position: Vec3,
|
||||
normal: Vec3,
|
||||
tex_coord: Vec2,
|
||||
}
|
||||
|
||||
#[derive(Debug, PartialEq)]
|
||||
struct Result {
|
||||
tangent: [f32; 3],
|
||||
bi_tangent: [f32; 3],
|
||||
mag_s: f32,
|
||||
mag_t: f32,
|
||||
bi_tangent_preserves_orientation: bool,
|
||||
face: usize,
|
||||
vert: usize,
|
||||
}
|
||||
|
||||
impl Result {
|
||||
fn new(
|
||||
tangent: [f32; 3],
|
||||
bi_tangent: [f32; 3],
|
||||
mag_s: f32,
|
||||
mag_t: f32,
|
||||
bi_tangent_preserves_orientation: bool,
|
||||
face: usize,
|
||||
vert: usize,
|
||||
) -> Self {
|
||||
Self {
|
||||
tangent,
|
||||
bi_tangent,
|
||||
mag_s,
|
||||
mag_t,
|
||||
bi_tangent_preserves_orientation,
|
||||
face,
|
||||
vert,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
struct Mesh {
|
||||
faces: Vec<Face>,
|
||||
vertices: Vec<Vertex>,
|
||||
}
|
||||
|
||||
struct Context {
|
||||
mesh: Mesh,
|
||||
results: Vec<Result>,
|
||||
}
|
||||
|
||||
fn vertex(mesh: &Mesh, face: usize, vert: usize) -> &Vertex {
|
||||
let vs: &[u32; 3] = &mesh.faces[face];
|
||||
&mesh.vertices[vs[vert] as usize]
|
||||
}
|
||||
|
||||
impl Geometry for Context {
|
||||
fn num_faces(&self) -> usize {
|
||||
self.mesh.faces.len()
|
||||
}
|
||||
|
||||
fn num_vertices_of_face(&self, _face: usize) -> usize {
|
||||
3
|
||||
}
|
||||
|
||||
fn position(&self, face: usize, vert: usize) -> [f32; 3] {
|
||||
vertex(&self.mesh, face, vert).position.into()
|
||||
}
|
||||
|
||||
fn normal(&self, face: usize, vert: usize) -> [f32; 3] {
|
||||
vertex(&self.mesh, face, vert).normal.into()
|
||||
}
|
||||
|
||||
fn tex_coord(&self, face: usize, vert: usize) -> [f32; 2] {
|
||||
vertex(&self.mesh, face, vert).tex_coord.into()
|
||||
}
|
||||
|
||||
fn set_tangent(
|
||||
&mut self,
|
||||
tangent: [f32; 3],
|
||||
bi_tangent: [f32; 3],
|
||||
mag_s: f32,
|
||||
mag_t: f32,
|
||||
bi_tangent_preserves_orientation: bool,
|
||||
face: usize,
|
||||
vert: usize,
|
||||
) {
|
||||
self.results.push(Result {
|
||||
tangent,
|
||||
bi_tangent,
|
||||
mag_s,
|
||||
mag_t,
|
||||
bi_tangent_preserves_orientation,
|
||||
face,
|
||||
vert,
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
struct ControlPoint {
|
||||
uv: [f32; 2],
|
||||
dir: [f32; 3],
|
||||
}
|
||||
|
||||
impl ControlPoint {
|
||||
fn new(uv: [f32; 2], dir: [f32; 3]) -> Self {
|
||||
Self { uv, dir }
|
||||
}
|
||||
}
|
||||
|
||||
fn make_cube() -> Mesh {
|
||||
let mut faces = Vec::new();
|
||||
let mut ctl_pts = Vec::new();
|
||||
let mut vertices = Vec::new();
|
||||
|
||||
// +x plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [1.0, -1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [1.0, -1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([1.0, 1.0], [1.0, 1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([1.0, 0.0], [1.0, 1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.5, 0.5], [1.0, 0.0, 0.0]));
|
||||
}
|
||||
|
||||
// -x plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint::new([1.0, 0.0], [-1.0, 1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([1.0, 1.0], [-1.0, 1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [-1.0, -1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [-1.0, -1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.5, 0.5], [-1.0, 0.0, 0.0]));
|
||||
}
|
||||
|
||||
// +y plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [1.0, 1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [1.0, 1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [-1.0, 1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [-1.0, 1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.5], [0.0, 1.0, 0.0]));
|
||||
}
|
||||
|
||||
// -y plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [-1.0, -1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [-1.0, -1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [1.0, -1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [1.0, -1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.5], [0.0, -1.0, 0.0]));
|
||||
}
|
||||
|
||||
// +z plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [-1.0, 1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [-1.0, -1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([1.0, 1.0], [1.0, -1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([1.0, 0.0], [1.0, 1.0, 1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.5, 0.5], [0.0, 0.0, 1.0]));
|
||||
}
|
||||
|
||||
// -z plane
|
||||
{
|
||||
let base = ctl_pts.len() as u32;
|
||||
faces.push([base, base + 1, base + 4]);
|
||||
faces.push([base + 1, base + 2, base + 4]);
|
||||
faces.push([base + 2, base + 3, base + 4]);
|
||||
faces.push([base + 3, base, base + 4]);
|
||||
ctl_pts.push(ControlPoint::new([1.0, 0.0], [1.0, 1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([1.0, 1.0], [1.0, -1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 1.0], [-1.0, -1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.0, 0.0], [-1.0, 1.0, -1.0]));
|
||||
ctl_pts.push(ControlPoint::new([0.5, 0.5], [0.0, 0.0, -1.0]));
|
||||
}
|
||||
|
||||
for pt in ctl_pts {
|
||||
let p: Vec3 = pt.dir.into();
|
||||
let n: Vec3 = p.normalize();
|
||||
let t: Vec2 = pt.uv.into();
|
||||
vertices.push(Vertex {
|
||||
position: (p / 2.0).into(),
|
||||
normal: n.into(),
|
||||
tex_coord: t.into(),
|
||||
});
|
||||
}
|
||||
|
||||
Mesh { faces, vertices }
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn cube_tangents_should_equal_reference_values() {
|
||||
let mut context = Context {
|
||||
mesh: make_cube(),
|
||||
results: Vec::new(),
|
||||
};
|
||||
let ret = generate_tangents(&mut context);
|
||||
assert_eq!(true, ret);
|
||||
|
||||
let expected_results: Vec<Result> = vec![
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, 0.40824825],
|
||||
[0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
0,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, -0.40824825],
|
||||
[-0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
0,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
0,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, -0.40824825],
|
||||
[-0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
1,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, 0.40824825],
|
||||
[-0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
1,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
1,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, 0.40824825],
|
||||
[-0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
2,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, -0.40824825],
|
||||
[0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
2,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
2,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, -0.40824825],
|
||||
[0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
3,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, 0.40824825],
|
||||
[0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
3,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
3,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, -0.40824825],
|
||||
[-0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
4,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, 0.40824825],
|
||||
[0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
4,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
4,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, 0.40824825],
|
||||
[0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
5,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, -0.40824825],
|
||||
[0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
5,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
5,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, -0.40824825],
|
||||
[0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
6,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, 0.40824825],
|
||||
[-0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
6,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
6,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, 0.40824825],
|
||||
[-0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
7,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, -0.40824825],
|
||||
[-0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
7,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
[0.00000000, 0.00000000, -1.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
7,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
8,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
8,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
8,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
9,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
9,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
9,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
10,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
10,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
10,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
11,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
11,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
11,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, 0.40824825],
|
||||
[-0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
12,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[-0.40824825, 0.81649655, -0.40824825],
|
||||
[0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
12,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
12,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
13,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, -0.40824825],
|
||||
[-0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
13,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
13,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, -0.40824825],
|
||||
[-0.40824825, 0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
14,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, 0.40824825],
|
||||
[0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
14,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
14,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.40824825, 0.81649655, 0.40824825],
|
||||
[0.40824825, -0.40824825, -0.81649655],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
15,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
15,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, 1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
15,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, 0.40824825],
|
||||
[-0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
16,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, 0.40824825],
|
||||
[0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
16,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
16,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, 0.40824825],
|
||||
[0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
17,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, -0.40824825],
|
||||
[-0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
17,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
17,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, -0.40824825],
|
||||
[-0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
18,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, -0.40824825],
|
||||
[0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
18,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
18,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, -0.40824825],
|
||||
[0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
19,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, 0.40824825],
|
||||
[-0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
19,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
false,
|
||||
19,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, 0.40824825],
|
||||
[0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
20,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, 0.40824825],
|
||||
[-0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
20,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
20,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, 0.40824825],
|
||||
[-0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
21,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, -0.40824825],
|
||||
[0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
21,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
21,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, -0.40824825],
|
||||
[0.40824825, -0.81649655, 0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
22,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, -0.40824825],
|
||||
[-0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
22,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
22,
|
||||
2,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, 0.40824825, -0.40824825],
|
||||
[-0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
23,
|
||||
0,
|
||||
),
|
||||
Result::new(
|
||||
[0.81649655, -0.40824825, 0.40824825],
|
||||
[0.40824825, -0.81649655, -0.40824825],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
23,
|
||||
1,
|
||||
),
|
||||
Result::new(
|
||||
[1.00000000, 0.00000000, 0.00000000],
|
||||
[0.00000000, -1.00000000, 0.00000000],
|
||||
1.00000000,
|
||||
1.00000000,
|
||||
true,
|
||||
23,
|
||||
2,
|
||||
),
|
||||
];
|
||||
|
||||
assert_eq!(expected_results, context.results);
|
||||
}
|
||||
|
|
@ -508,8 +508,12 @@ fn fragment(in: FragmentInput) -> [[location(0)]] vec4<f32> {
|
|||
|
||||
#ifdef VERTEX_TANGENTS
|
||||
#ifdef STANDARDMATERIAL_NORMAL_MAP
|
||||
var T: vec3<f32> = normalize(in.world_tangent.xyz - N * dot(in.world_tangent.xyz, N));
|
||||
var B: vec3<f32> = cross(N, T) * in.world_tangent.w;
|
||||
// NOTE: The mikktspace method of normal mapping explicitly requires that these NOT be
|
||||
// normalized nor any Gram-Schmidt applied to ensure the vertex normal is orthogonal to the
|
||||
// vertex tangent! Do not change this code unless you really know what you are doing.
|
||||
// http://www.mikktspace.com/
|
||||
var T: vec3<f32> = in.world_tangent.xyz;
|
||||
var B: vec3<f32> = in.world_tangent.w * cross(N, T);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
|
|
@ -541,7 +545,12 @@ fn fragment(in: FragmentInput) -> [[location(0)]] vec4<f32> {
|
|||
if ((material.flags & STANDARD_MATERIAL_FLAGS_FLIP_NORMAL_MAP_Y) != 0u) {
|
||||
Nt.y = -Nt.y;
|
||||
}
|
||||
N = normalize(TBN * Nt);
|
||||
// NOTE: The mikktspace method of normal mapping applies maps the tangent-space normal from
|
||||
// the normal map texture in this way to be an EXACT inverse of how the normal map baker
|
||||
// calculates the normal maps so there is no error introduced. Do not change this code
|
||||
// unless you really know what you are doing.
|
||||
// http://www.mikktspace.com/
|
||||
N = normalize(Nt.x * T + Nt.y * B + Nt.z * N);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -35,6 +35,7 @@ bevy_derive = { path = "../bevy_derive", version = "0.8.0-dev" }
|
|||
bevy_ecs = { path = "../bevy_ecs", version = "0.8.0-dev" }
|
||||
bevy_encase_derive = { path = "../bevy_encase_derive", version = "0.8.0-dev" }
|
||||
bevy_math = { path = "../bevy_math", version = "0.8.0-dev" }
|
||||
bevy_mikktspace = { path = "../bevy_mikktspace", version = "0.8.0-dev" }
|
||||
bevy_reflect = { path = "../bevy_reflect", version = "0.8.0-dev", features = ["bevy"] }
|
||||
bevy_render_macros = { path = "macros", version = "0.8.0-dev" }
|
||||
bevy_transform = { path = "../bevy_transform", version = "0.8.0-dev" }
|
||||
|
|
|
|||
|
|
@ -328,6 +328,16 @@ impl Mesh {
|
|||
self.insert_attribute(Mesh::ATTRIBUTE_NORMAL, normals);
|
||||
}
|
||||
|
||||
/// Generate tangents for the mesh using the `mikktspace` algorithm.
|
||||
///
|
||||
/// Sets the [`Mesh::ATTRIBUTE_TANGENT`] attribute if successful.
|
||||
/// Requires a [`PrimitiveTopology::TriangleList`] topology and the [`Mesh::ATTRIBUTE_POSITION`], [`Mesh::ATTRIBUTE_NORMAL`] and [`Mesh::ATTRIBUTE_UV_0`] attributes set.
|
||||
pub fn generate_tangents(&mut self) -> Result<(), GenerateTangentsError> {
|
||||
let tangents = generate_tangents_for_mesh(self)?;
|
||||
self.insert_attribute(Mesh::ATTRIBUTE_TANGENT, tangents);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Compute the Axis-Aligned Bounding Box of the mesh vertices in model space
|
||||
pub fn compute_aabb(&self) -> Option<Aabb> {
|
||||
if let Some(VertexAttributeValues::Float32x3(values)) =
|
||||
|
|
@ -822,3 +832,129 @@ impl RenderAsset for Mesh {
|
|||
})
|
||||
}
|
||||
}
|
||||
|
||||
struct MikktspaceGeometryHelper<'a> {
|
||||
indices: &'a Indices,
|
||||
positions: &'a Vec<[f32; 3]>,
|
||||
normals: &'a Vec<[f32; 3]>,
|
||||
uvs: &'a Vec<[f32; 2]>,
|
||||
tangents: Vec<[f32; 4]>,
|
||||
}
|
||||
|
||||
impl MikktspaceGeometryHelper<'_> {
|
||||
fn index(&self, face: usize, vert: usize) -> usize {
|
||||
let index_index = face * 3 + vert;
|
||||
|
||||
match self.indices {
|
||||
Indices::U16(indices) => indices[index_index] as usize,
|
||||
Indices::U32(indices) => indices[index_index] as usize,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl bevy_mikktspace::Geometry for MikktspaceGeometryHelper<'_> {
|
||||
fn num_faces(&self) -> usize {
|
||||
self.indices.len() / 3
|
||||
}
|
||||
|
||||
fn num_vertices_of_face(&self, _: usize) -> usize {
|
||||
3
|
||||
}
|
||||
|
||||
fn position(&self, face: usize, vert: usize) -> [f32; 3] {
|
||||
self.positions[self.index(face, vert)]
|
||||
}
|
||||
|
||||
fn normal(&self, face: usize, vert: usize) -> [f32; 3] {
|
||||
self.normals[self.index(face, vert)]
|
||||
}
|
||||
|
||||
fn tex_coord(&self, face: usize, vert: usize) -> [f32; 2] {
|
||||
self.uvs[self.index(face, vert)]
|
||||
}
|
||||
|
||||
fn set_tangent_encoded(&mut self, tangent: [f32; 4], face: usize, vert: usize) {
|
||||
let idx = self.index(face, vert);
|
||||
self.tangents[idx] = tangent;
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(thiserror::Error, Debug)]
|
||||
/// Failed to generate tangents for the mesh.
|
||||
pub enum GenerateTangentsError {
|
||||
#[error("cannot generate tangents for {0:?}")]
|
||||
UnsupportedTopology(PrimitiveTopology),
|
||||
#[error("missing indices")]
|
||||
MissingIndices,
|
||||
#[error("missing vertex attributes '{0}'")]
|
||||
MissingVertexAttribute(&'static str),
|
||||
#[error("the '{0}' vertex attribute should have {1:?} format")]
|
||||
InvalidVertexAttributeFormat(&'static str, VertexFormat),
|
||||
#[error("mesh not suitable for tangent generation")]
|
||||
MikktspaceError,
|
||||
}
|
||||
|
||||
fn generate_tangents_for_mesh(mesh: &Mesh) -> Result<Vec<[f32; 4]>, GenerateTangentsError> {
|
||||
match mesh.primitive_topology() {
|
||||
PrimitiveTopology::TriangleList => {}
|
||||
other => return Err(GenerateTangentsError::UnsupportedTopology(other)),
|
||||
};
|
||||
|
||||
let positions = match mesh.attribute(Mesh::ATTRIBUTE_POSITION).ok_or(
|
||||
GenerateTangentsError::MissingVertexAttribute(Mesh::ATTRIBUTE_POSITION.name),
|
||||
)? {
|
||||
VertexAttributeValues::Float32x3(vertices) => vertices,
|
||||
_ => {
|
||||
return Err(GenerateTangentsError::InvalidVertexAttributeFormat(
|
||||
Mesh::ATTRIBUTE_POSITION.name,
|
||||
VertexFormat::Float32x3,
|
||||
))
|
||||
}
|
||||
};
|
||||
let normals = match mesh.attribute(Mesh::ATTRIBUTE_NORMAL).ok_or(
|
||||
GenerateTangentsError::MissingVertexAttribute(Mesh::ATTRIBUTE_NORMAL.name),
|
||||
)? {
|
||||
VertexAttributeValues::Float32x3(vertices) => vertices,
|
||||
_ => {
|
||||
return Err(GenerateTangentsError::InvalidVertexAttributeFormat(
|
||||
Mesh::ATTRIBUTE_NORMAL.name,
|
||||
VertexFormat::Float32x3,
|
||||
))
|
||||
}
|
||||
};
|
||||
let uvs = match mesh.attribute(Mesh::ATTRIBUTE_UV_0).ok_or(
|
||||
GenerateTangentsError::MissingVertexAttribute(Mesh::ATTRIBUTE_UV_0.name),
|
||||
)? {
|
||||
VertexAttributeValues::Float32x2(vertices) => vertices,
|
||||
_ => {
|
||||
return Err(GenerateTangentsError::InvalidVertexAttributeFormat(
|
||||
Mesh::ATTRIBUTE_UV_0.name,
|
||||
VertexFormat::Float32x2,
|
||||
))
|
||||
}
|
||||
};
|
||||
let indices = mesh
|
||||
.indices()
|
||||
.ok_or(GenerateTangentsError::MissingIndices)?;
|
||||
|
||||
let len = positions.len();
|
||||
let tangents = vec![[0., 0., 0., 0.]; len];
|
||||
let mut mikktspace_mesh = MikktspaceGeometryHelper {
|
||||
indices,
|
||||
positions,
|
||||
normals,
|
||||
uvs,
|
||||
tangents,
|
||||
};
|
||||
let success = bevy_mikktspace::generate_tangents(&mut mikktspace_mesh);
|
||||
if !success {
|
||||
return Err(GenerateTangentsError::MikktspaceError);
|
||||
}
|
||||
|
||||
// mikktspace seems to assume left-handedness so we can flip the sign to correct for this
|
||||
for tangent in &mut mikktspace_mesh.tangents {
|
||||
tangent[3] = -tangent[3];
|
||||
}
|
||||
|
||||
Ok(mikktspace_mesh.tangents)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -23,6 +23,7 @@ crates=(
|
|||
bevy_window
|
||||
bevy_encase_derive
|
||||
bevy_render/macros
|
||||
bevy_mikktspace
|
||||
bevy_render
|
||||
bevy_core_pipeline
|
||||
bevy_input
|
||||
|
|
|
|||
Loading…
Reference in a new issue