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# Objective A big step in the migration to required components: meshes and materials! ## Solution As per the [selected proposal](https://hackmd.io/@bevy/required_components/%2Fj9-PnF-2QKK0on1KQ29UWQ): - Deprecate `MaterialMesh2dBundle`, `MaterialMeshBundle`, and `PbrBundle`. - Add `Mesh2d` and `Mesh3d` components, which wrap a `Handle<Mesh>`. - Add `MeshMaterial2d<M: Material2d>` and `MeshMaterial3d<M: Material>`, which wrap a `Handle<M>`. - Meshes *without* a mesh material should be rendered with a default material. The existence of a material is determined by `HasMaterial2d`/`HasMaterial3d`, which is required by `MeshMaterial2d`/`MeshMaterial3d`. This gets around problems with the generics. Previously: ```rust commands.spawn(MaterialMesh2dBundle { mesh: meshes.add(Circle::new(100.0)).into(), material: materials.add(Color::srgb(7.5, 0.0, 7.5)), transform: Transform::from_translation(Vec3::new(-200., 0., 0.)), ..default() }); ``` Now: ```rust commands.spawn(( Mesh2d(meshes.add(Circle::new(100.0))), MeshMaterial2d(materials.add(Color::srgb(7.5, 0.0, 7.5))), Transform::from_translation(Vec3::new(-200., 0., 0.)), )); ``` If the mesh material is missing, previously nothing was rendered. Now, it renders a white default `ColorMaterial` in 2D and a `StandardMaterial` in 3D (this can be overridden). Below, only every other entity has a material:   Why white? This is still open for discussion, but I think white makes sense for a *default* material, while *invalid* asset handles pointing to nothing should have something like a pink material to indicate that something is broken (I don't handle that in this PR yet). This is kind of a mix of Godot and Unity: Godot just renders a white material for non-existent materials, while Unity renders nothing when no materials exist, but renders pink for invalid materials. I can also change the default material to pink if that is preferable though. ## Testing I ran some 2D and 3D examples to test if anything changed visually. I have not tested all examples or features yet however. If anyone wants to test more extensively, it would be appreciated! ## Implementation Notes - The relationship between `bevy_render` and `bevy_pbr` is weird here. `bevy_render` needs `Mesh3d` for its own systems, but `bevy_pbr` has all of the material logic, and `bevy_render` doesn't depend on it. I feel like the two crates should be refactored in some way, but I think that's out of scope for this PR. - I didn't migrate meshlets to required components yet. That can probably be done in a follow-up, as this is already a huge PR. - It is becoming increasingly clear to me that we really, *really* want to disallow raw asset handles as components. They caused me a *ton* of headache here already, and it took me a long time to find every place that queried for them or inserted them directly on entities, since there were no compiler errors for it. If we don't remove the `Component` derive, I expect raw asset handles to be a *huge* footgun for users as we transition to wrapper components, especially as handles as components have been the norm so far. I personally consider this to be a blocker for 0.15: we need to migrate to wrapper components for asset handles everywhere, and remove the `Component` derive. Also see https://github.com/bevyengine/bevy/issues/14124. --- ## Migration Guide Asset handles for meshes and mesh materials must now be wrapped in the `Mesh2d` and `MeshMaterial2d` or `Mesh3d` and `MeshMaterial3d` components for 2D and 3D respectively. Raw handles as components no longer render meshes. Additionally, `MaterialMesh2dBundle`, `MaterialMeshBundle`, and `PbrBundle` have been deprecated. Instead, use the mesh and material components directly. Previously: ```rust commands.spawn(MaterialMesh2dBundle { mesh: meshes.add(Circle::new(100.0)).into(), material: materials.add(Color::srgb(7.5, 0.0, 7.5)), transform: Transform::from_translation(Vec3::new(-200., 0., 0.)), ..default() }); ``` Now: ```rust commands.spawn(( Mesh2d(meshes.add(Circle::new(100.0))), MeshMaterial2d(materials.add(Color::srgb(7.5, 0.0, 7.5))), Transform::from_translation(Vec3::new(-200., 0., 0.)), )); ``` If the mesh material is missing, a white default material is now used. Previously, nothing was rendered if the material was missing. The `WithMesh2d` and `WithMesh3d` query filter type aliases have also been removed. Simply use `With<Mesh2d>` or `With<Mesh3d>`. --------- Co-authored-by: Tim Blackbird <justthecooldude@gmail.com> Co-authored-by: Carter Anderson <mcanders1@gmail.com>
78 lines
2.5 KiB
Rust
78 lines
2.5 KiB
Rust
//! This example shows various ways to configure texture materials in 3D.
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use std::f32::consts::PI;
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use bevy::prelude::*;
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Startup, setup)
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.run();
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}
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/// sets up a scene with textured entities
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fn setup(
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mut commands: Commands,
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asset_server: Res<AssetServer>,
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mut meshes: ResMut<Assets<Mesh>>,
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mut materials: ResMut<Assets<StandardMaterial>>,
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) {
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// load a texture and retrieve its aspect ratio
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let texture_handle = asset_server.load("branding/bevy_logo_dark_big.png");
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let aspect = 0.25;
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// create a new quad mesh. this is what we will apply the texture to
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let quad_width = 8.0;
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let quad_handle = meshes.add(Rectangle::new(quad_width, quad_width * aspect));
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// this material renders the texture normally
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let material_handle = materials.add(StandardMaterial {
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base_color_texture: Some(texture_handle.clone()),
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alpha_mode: AlphaMode::Blend,
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unlit: true,
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..default()
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});
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// this material modulates the texture to make it red (and slightly transparent)
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let red_material_handle = materials.add(StandardMaterial {
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base_color: Color::srgba(1.0, 0.0, 0.0, 0.5),
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base_color_texture: Some(texture_handle.clone()),
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alpha_mode: AlphaMode::Blend,
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unlit: true,
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..default()
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});
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// and lets make this one blue! (and also slightly transparent)
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let blue_material_handle = materials.add(StandardMaterial {
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base_color: Color::srgba(0.0, 0.0, 1.0, 0.5),
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base_color_texture: Some(texture_handle),
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alpha_mode: AlphaMode::Blend,
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unlit: true,
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..default()
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});
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// textured quad - normal
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commands.spawn((
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Mesh3d(quad_handle.clone()),
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MeshMaterial3d(material_handle),
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Transform::from_xyz(0.0, 0.0, 1.5).with_rotation(Quat::from_rotation_x(-PI / 5.0)),
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));
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// textured quad - modulated
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commands.spawn((
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Mesh3d(quad_handle.clone()),
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MeshMaterial3d(red_material_handle),
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Transform::from_rotation(Quat::from_rotation_x(-PI / 5.0)),
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));
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// textured quad - modulated
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commands.spawn((
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Mesh3d(quad_handle),
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MeshMaterial3d(blue_material_handle),
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Transform::from_xyz(0.0, 0.0, -1.5).with_rotation(Quat::from_rotation_x(-PI / 5.0)),
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));
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// camera
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commands.spawn(Camera3dBundle {
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transform: Transform::from_xyz(3.0, 5.0, 8.0).looking_at(Vec3::ZERO, Vec3::Y),
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..default()
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});
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}
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