Epic's GPUlightmass

CPU/GPU comparison, definitely seems to be some significant missing features here.

Scene Setup: Stationary directional light (area shadows enabled), static skylight, static spotlight with 25 outer cone angle. Using raytraced AO. All settings are otherwise default, no lightmass portals


Honestly not really clear on what the irradiance cache settings do so I may have picked some ****** ones. Some immediately noticeable things:

  1. Temperature of the scene is completely different, not sure of the cause but I suspect GPU LM doesn’t sample the color of the skylight correctly.
  2. Static spotlight completely disappears when GPU rendered, I believe its intensity is being scaled by its outer cone angle.
  3. Behavior of area shadows is completely different, not sure it does anything with GPU LM.