bevy/crates
JMS55 6d6810c90d
Meshlet continuous LOD (#12755)
Adds a basic level of detail system to meshlets. An extremely brief
summary is as follows:
* In `from_mesh.rs`, once we've built the first level of clusters, we
group clusters, simplify the new mega-clusters, and then split the
simplified groups back into regular sized clusters. Repeat several times
(ideally until you can't anymore). This forms a directed acyclic graph
(DAG), where the children are the meshlets from the previous level, and
the parents are the more simplified versions of their children. The leaf
nodes are meshlets formed from the original mesh.
* In `cull_meshlets.wgsl`, each cluster selects whether to render or not
based on the LOD bounding sphere (different than the culling bounding
sphere) of the current meshlet, the LOD bounding sphere of its parent
(the meshlet group from simplification), and the simplification error
relative to its children of both the current meshlet and its parent
meshlet. This kind of breaks two pass occlusion culling, which will be
fixed in a future PR by using an HZB from the previous frame to get the
initial list of occluders.

Many, _many_ improvements to be done in the future
https://github.com/bevyengine/bevy/issues/11518, not least of which is
code quality and speed. I don't even expect this to work on many types
of input meshes. This is just a basic implementation/draft for
collaboration.

Arguable how much we want to do in this PR, I'll leave that up to
maintainers. I've erred on the side of "as basic as possible".

References:
* Slides 27-77 (video available on youtube)
https://advances.realtimerendering.com/s2021/Karis_Nanite_SIGGRAPH_Advances_2021_final.pdf
*
https://blog.traverseresearch.nl/creating-a-directed-acyclic-graph-from-a-mesh-1329e57286e5
*
https://jglrxavpok.github.io/2024/01/19/recreating-nanite-lod-generation.html,
https://jglrxavpok.github.io/2024/03/12/recreating-nanite-faster-lod-generation.html,
https://jglrxavpok.github.io/2024/04/02/recreating-nanite-runtime-lod-selection.html,
and https://github.com/jglrxavpok/Carrot
*
https://github.com/gents83/INOX/tree/master/crates/plugins/binarizer/src
* https://cs418.cs.illinois.edu/website/text/nanite.html


![image](https://github.com/bevyengine/bevy/assets/47158642/e40bff9b-7d0c-4a19-a3cc-2aad24965977)

![image](https://github.com/bevyengine/bevy/assets/47158642/442c7da3-7761-4da7-9acd-37f15dd13e26)

---------

Co-authored-by: Ricky Taylor <rickytaylor26@gmail.com>
Co-authored-by: vero <email@atlasdostal.com>
Co-authored-by: François <mockersf@gmail.com>
Co-authored-by: atlas dostal <rodol@rivalrebels.com>
Co-authored-by: Patrick Walton <pcwalton@mimiga.net>
2024-04-23 21:43:53 +00:00
..
bevy_a11y Set the logo and favicon for all of Bevy's published crates (#12696) 2024-03-25 18:52:50 +00:00
bevy_animation Expose mutable Animation Clips (#13067) 2024-04-23 14:58:08 +00:00
bevy_app Simplify runner app exit code. (#13074) 2024-04-23 20:42:00 +00:00
bevy_asset Fix Clippy lints on WASM (#13030) 2024-04-20 09:15:42 +00:00
bevy_audio Implement clone for most bundles. (#12993) 2024-04-16 16:37:09 +00:00
bevy_color Fix crates not building individually (#12948) 2024-04-14 00:06:03 +00:00
bevy_core Fix beta lints (#12980) 2024-04-16 02:46:46 +00:00
bevy_core_pipeline Document Camera coordinate space (#13012) 2024-04-18 13:02:15 +00:00
bevy_derive Forbid unsafe in most crates in the engine (#12684) 2024-03-27 03:30:08 +00:00
bevy_dev_tools Make AppExit more specific about exit reason. (#13022) 2024-04-22 16:48:18 +00:00
bevy_diagnostic Refactor App and SubApp internals for better separation (#9202) 2024-03-31 03:16:10 +00:00
bevy_dylib Set the logo and favicon for all of Bevy's published crates (#12696) 2024-03-25 18:52:50 +00:00
bevy_dynamic_plugin Forbid unsafe in most crates in the engine (#12684) 2024-03-27 03:30:08 +00:00
bevy_ecs Improve par_iter and Parallel (#12904) 2024-04-23 12:05:34 +00:00
bevy_ecs_compile_fail_tests Fix Ci failing over dead code in tests (#12623) 2024-03-21 18:08:47 +00:00
bevy_encase_derive Forbid unsafe in most crates in the engine (#12684) 2024-03-27 03:30:08 +00:00
bevy_gilrs Forbid unsafe in most crates in the engine (#12684) 2024-03-27 03:30:08 +00:00
bevy_gizmos Contextually clearing gizmos (#10973) 2024-04-23 00:16:12 +00:00
bevy_gltf Fix crates not building individually (#12948) 2024-04-14 00:06:03 +00:00
bevy_hierarchy fix bevy_hierarchy crate optional feature bevy_app (#12943) 2024-04-13 04:46:00 +00:00
bevy_input Added ButtonInput docs usage example (#13046) 2024-04-22 17:48:46 +00:00
bevy_internal Switch monolithic lib to module re-exports (#13059) 2024-04-22 01:32:51 +00:00
bevy_log Refactor App and SubApp internals for better separation (#9202) 2024-03-31 03:16:10 +00:00
bevy_macro_utils Clean up some low level dependencies (#12858) 2024-04-08 19:45:42 +00:00
bevy_macros_compile_fail_tests Fix Ci failing over dead code in tests (#12623) 2024-03-21 18:08:47 +00:00
bevy_math Additional doc aliases for WindingOrder in bevy_math (#13065) 2024-04-22 21:50:27 +00:00
bevy_mikktspace Enable clippy::ref_as_ptr (#12918) 2024-04-10 20:16:48 +00:00
bevy_pbr Meshlet continuous LOD (#12755) 2024-04-23 21:43:53 +00:00
bevy_ptr Fix uses of "it's" vs "its". (#13033) 2024-04-19 18:17:31 +00:00
bevy_reflect Fix uses of "it's" vs "its". (#13033) 2024-04-19 18:17:31 +00:00
bevy_reflect_compile_fail_tests Fix Ci failing over dead code in tests (#12623) 2024-03-21 18:08:47 +00:00
bevy_render Improve par_iter and Parallel (#12904) 2024-04-23 12:05:34 +00:00
bevy_scene Implement clone for most bundles. (#12993) 2024-04-16 16:37:09 +00:00
bevy_sprite Remove unused push constants (#13076) 2024-04-23 21:43:46 +00:00
bevy_tasks Remove async-task as a dependency (#13071) 2024-04-23 14:57:55 +00:00
bevy_text Fix beta lints (#12980) 2024-04-16 02:46:46 +00:00
bevy_time Fix uses of "it's" vs "its". (#13033) 2024-04-19 18:17:31 +00:00
bevy_transform Fix Clippy lints on WASM (#13030) 2024-04-20 09:15:42 +00:00
bevy_ui Correctly handle UI hierarchy without a camera (#12816) 2024-04-22 16:42:13 +00:00
bevy_utils Improve par_iter and Parallel (#12904) 2024-04-23 12:05:34 +00:00
bevy_window Make AppExit more specific about exit reason. (#13022) 2024-04-22 16:48:18 +00:00
bevy_winit Simplify runner app exit code. (#13074) 2024-04-23 20:42:00 +00:00