my graphics playground in Rust, using:

• https://github.com/gfx-rs/naga
• https://github.com/gfx-rs/wgpu
• https://github.com/EmbarkStudios/rust-gpu
• https://github.com/bevyengine/bevy

run with cargo run -p toy-xxx --release

done and TODOs

• data structures (in common)
  • sparse voxel N-tree (svt.rs) and ray casting: no children masks, each voxel is 4 byte pointer or data
    • performance
      • compare with ESVO performance
      • optimize it to be faster
        • rust-gpu performance problem
        • why the compute shader version is even slower?
      • beam optimization
      • redirect rays
    • API
      • load .vox file
• shadering (in common)
  • textures
  • basic material in "One Weekend"
  • glass material seems wrong??
  • shadow rays
  • volume fog material in "Next Week"
  • .vox complete
  • more physics based materials?
  • TAA???
  • DLSS???
• engine
  • shader hot reloading of rust-gpu shader in bevy
  • compute shader hot reloading (using include_raw is very bad)
  • creating RenderNode in bevy is really not a good exp, lot of code
  • group everything better with switchable demo, adjustable specialized constants

problems with rust-gpu

• you cannnot do vec[0], use vec.x instead
• no specialization constant
• you need to be sure not to write performance bad code
  • array initialization
  • array bound check
• perf is ~1.25 times of GLSL, it might produce branchy code seems?
• code generation: it expand vec ops not as SpirV vec ops, but this doesn't hurt performance most of time

referneces

• data structure
  • GigaVoxels: http://gigavoxels.inrialpes.fr/
  • ESVO: https://research.nvidia.com/sites/default/files/pubs/2010-02_Efficient-Sparse-Voxel/laine2010i3d_paper.pdf
    • https://github.com/AdamYuan/SparseVoxelOctree
    • https://github.com/Ria8651/voxel-tracing-playground
    • https://github.com/Neo-Zhixing/dust
  • GVDB: https://developer.nvidia.com/gvdb
  • NanoVDB: https://developer.nvidia.com/nanovdb
  • BrickMap: https://dspace.library.uu.nl/handle/1874/315917
    • https://github.com/stijnherfst/BrickMap
    • https://github.com/rebelroad-reinhart/brickmap-vulkan
  • SSVDAG: https://jcgt.org/published/0006/02/01/
    • https://github.com/RvanderLaan/DAGger
  • more random ones bellow
  • https://jacco.ompf2.com/2021/02/01/a-voxel-renderer-for-learning-c-c/
  • https://www.reddit.com/r/VoxelGameDev/comments/cmsu9a/raytraced_voxel_engine/
  • https://github.com/DavidWilliams81/cubiquity
  • https://github.com/mgerhardy/engine
• ray tracing
  • Ray Tracing in One Weekend: https://raytracing.github.io/
    • https://github.com/mitchmindtree/nannou-rustgpu-raytracer
  • PBRT: https://www.pbrt.org/
  • GPU Wavefront Path Tracing: https://research.nvidia.com/sites/default/files/pubs/2013-07_Megakernels-Considered-Harmful/laine2013hpg_paper.pdf
    • https://jacco.ompf2.com/2019/07/18/wavefront-path-tracing/
  • TAA: http://behindthepixels.io/assets/files/TemporalAA.pdf
    • https://github.com/oskarbraten/voxel-path-tracer
  • more random ones bellow
  • https://github.com/gkjohnson/three-gpu-pathtracing
  • https://github.com/chunky-dev/chunky/
  • https://github.com/erichlof/THREE.js-PathTracing-Renderer
  • https://github.com/EmbarkStudios/kajiya
• webgpu & rust-gpu
  • the compute shader are adapted from https://github.com/googlefonts/compute-shader-101