keywords: Performance, Optimization, PrePass DDM_AllOpaque(Forced by DBuffer)

Summary

Command

The text version of GPU Visualizer (shortcuts: Ctrl + Shift + ,), command:

Stat GPU

GPU Visualizer arguments specification

PrePass DDM_…

Sense

  • Early rendering of depth(Z) from non-translucent meshed.
  • Required by DBuffer decals.
  • May be used by occlusion culling.
  • Engine -> Rendering -> Optimizations -> Early Z-pass.

Cost affected by

  • Triangle count of opaque objects.
  • Depending on Early Z settings: Overdraw and complexity of Masked materials.
ShadowDepths

Sense

  • Generation of depth maps for shadow-casting lights.
  • It’s like rendering scene’s depth from light’s point of view.
  • sg.ShadowQuality 0...4

Cost affected by

  • Number and range of shadow-casting lights.
  • Number and triangle count of movable shadow-casting objects.
  • Shadow quality settings.

Reference

UE4 Graphics Profiling: All Categories Guide (Rendering Passes)
https://www.youtube.com/watch?v=C3lumWdwHmA

GPU Profiling
https://docs.unrealengine.com/en-us/Engine/Performance/GPU

会挽雕弓如满月，西北望，射天狼。----苏轼《江城子·密州出猎》