2022.04.03

• UE 网络同步分享
• many punctual lights shadow map

UE 网络同步分享

• package –> bunch for each actor
• UDP 加上层简单实现的可靠通信，一次ACK
• 同步应该同步哪些信息，比如精准的动画交互等，既要保证数据量的最小化，又要保证数据的

many punctual lights shadow map

• cubemap texture array
• atlas
• virtual texture

resources

• http://www.adriancourreges.com/blog/2016/09/09/doom-2016-graphics-study/
  Shadow Map Atlas
  For each light casting a shadow, a unique depth map is generated and saved into one tile of a giant 8k x 8k texture atlas. However not every single depth map is calculated at every frame: DOOM heavily re-uses the result of the previous frame and regenerates only the depth maps which need to be updated.
  
  When a light is static and casts shadows only on static objects it makes sense to simply keep its depth map as-is instead of doing unnecessary re-calculation. If some enemy is moving under the light though, the depth map must be generated again.
  Depth map sizes can vary depending on the light distance from the camera, also re-generated depth maps don’t necessarily stay inside the same tile within the atlas.
  DOOM has specific optimizations like caching the static portion of a depth map, computing then only the dynamic meshes projection and compositing the results.

• source code —- Frosbite atlas
  FrostbiteEngine/World/Render/Lighting/LocalLightShadowModule.cpp
  

• source code —- UE

  • atlas
    
  • virtual shadow map
    https://docs.unrealengine.com/5.0/en-US/RenderingFeatures/VirtualShadowMaps/