Off-Screen-Particles
Render the Particles to a half-resolusion texture and blend to full resolution according to the depth distribution. If the interpolated depth is closer to the depth of the point sample, the color of the point sample is filled, otherwise the color of the linear sample is filled.
Effective Compare
GroudTruth
UE_Effective
In the case of DepthFade, there is aliasing due to direct sampling of SceneColor
My_Effective
DepthLoad
Try to use the original depth texture directly when using DepthFade
FrameFetch
Optimization Result
Before：
After：
How To Use It
- 对于要离屏渲染的材质勾选bDownSampleSeparateTranslucency
- 确认Engine中开启r.Mobile.SeparateTranslucency
TIPS
- 低端机本来Shading消耗就比较少，不太适用这个技术，比较适合于中端手机。
- 若粒子有多个非Opaque材质请全部勾选，否则会渲染两次粒子。仅支持Translucency与Additive
- 目前不支持MSAA，待后续需求
PS
- Mobile平台不会写出SceneDepth，所有深度信息要从Alpha中获取。