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# 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. |
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| .. | ||
| 3d_scene.rs | ||
| 3d_scene_pipelined.rs | ||
| cornell_box_pipelined.rs | ||
| load_gltf.rs | ||
| load_gltf_pipelined.rs | ||
| msaa.rs | ||
| orthographic.rs | ||
| orthographic_pipelined.rs | ||
| parenting.rs | ||
| pbr.rs | ||
| pbr_pipelined.rs | ||
| render_to_texture.rs | ||
| shadow_biases_pipelined.rs | ||
| shadow_caster_receiver_pipelined.rs | ||
| spawner.rs | ||
| texture.rs | ||
| texture_pipelined.rs | ||
| update_gltf_scene.rs | ||
| wireframe.rs | ||
| z_sort_debug.rs | ||