Graphics Programming Virtual Meetup
Discord
Raytraced Shadows in Call of Duty: Modern Warefare
Raytracing and Acceleration Structures
Presentation Link
Video of presentation
Summary
- Raytracing works well for visibility of local lights
- Balance merging of geometries into BLASes
- Merging impacts instancing
- BLAS build is slow, use multithreaded command lists
- Shadows dont need many slow raytracing features
- Except for alpha tested geometry
- Mismatch between BLAS and geometry
- Solution uses ray bias in AnyHit shader
DXR Overview
- Several new shaders
- AnyHit, Miss, Closest hit, & more
- Communicate through 'payload'
- Acceleration Structures (AS's) for ray traversal
- BLAS & TLAS - Top & Bottom level AS's
- Helps with rebuilding quickly
