mirror of
https://github.com/bevyengine/bevy
synced 2024-11-22 04:33:37 +00:00
045f324e97
# Objective Forward perspective projections have poor floating point precision distribution over the depth range. Reverse projections fair much better, and instead of having to have a far plane, with the reverse projection, using an infinite far plane is not a problem. The infinite reverse perspective projection has become the industry standard. The renderer rework is a great time to migrate to it. ## Solution All perspective projections, including point lights, have been moved to using `glam::Mat4::perspective_infinite_reverse_rh()` and so have no far plane. As various depth textures are shared between orthographic and perspective projections, a quirk of this PR is that the near and far planes of the orthographic projection are swapped when the Mat4 is computed. This has no impact on 2D/3D orthographic projection usage, and provides consistency in shaders, texture clear values, etc. throughout the codebase. ## Known issues For some reason, when looking along -Z, all geometry is black. The camera can be translated up/down / strafed left/right and geometry will still be black. Moving forward/backward or rotating the camera away from looking exactly along -Z causes everything to work as expected. I have tried to debug this issue but both in macOS and Windows I get crashes when doing pixel debugging. If anyone could reproduce this and debug it I would be very grateful. Otherwise I will have to try to debug it further without pixel debugging, though the projections and such all looked fine to me.
71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
use bevy::{
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ecs::prelude::*,
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math::Vec3,
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pbr2::{PbrBundle, PointLightBundle, StandardMaterial},
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prelude::{App, Assets, Transform},
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render2::{
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camera::OrthographicCameraBundle,
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color::Color,
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mesh::{shape, Mesh},
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},
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PipelinedDefaultPlugins,
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};
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fn main() {
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App::new()
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.add_plugins(PipelinedDefaultPlugins)
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.add_startup_system(setup.system())
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.run();
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}
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/// set up a simple 3D scene
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fn setup(
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mut commands: Commands,
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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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// set up the camera
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let mut camera = OrthographicCameraBundle::new_3d();
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camera.orthographic_projection.scale = 3.0;
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camera.transform = Transform::from_xyz(5.0, 5.0, 5.0).looking_at(Vec3::ZERO, Vec3::Y);
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// camera
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commands.spawn_bundle(camera);
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// plane
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })),
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material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
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..Default::default()
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});
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// cubes
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
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material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
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transform: Transform::from_xyz(1.5, 0.5, 1.5),
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..Default::default()
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});
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
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material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
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transform: Transform::from_xyz(1.5, 0.5, -1.5),
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..Default::default()
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});
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
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material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
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transform: Transform::from_xyz(-1.5, 0.5, 1.5),
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..Default::default()
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});
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commands.spawn_bundle(PbrBundle {
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mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
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material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
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transform: Transform::from_xyz(-1.5, 0.5, -1.5),
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..Default::default()
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});
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// light
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commands.spawn_bundle(PointLightBundle {
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transform: Transform::from_xyz(3.0, 8.0, 5.0),
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..Default::default()
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});
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}
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