Skip to content

Reflection Actors#

  • Buildtime scene cubemap captures projected onto spheres/boxes

  • Can nest them and at run time, shader will interpolate between them to fake parallax correct reflections

  • Obviously has light leak b/c it doesn’t take into account local occlusion

  • Does not provide dynamic or sharp refletions

  • Updated dynamically in the editor but locked in game mode

  • Different glossy levels point to different parts of the mipmap chain

  • Roughness material parameter is used to blend between indirect diffuse lightmap data and the reflection cubemap (i.e. fully rough = using purely lightmap indirect data)

  • Lightmap data should not include direct lighting for this to work (otherwise you get double lighting) i.e. turn off static lights when baking lightmap data and only use stationary lights

  • https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/ReflectionEnvironment/index.html

Reflection Environment: provides indirect specular

  • indirect meaning specular from other objects in the scene. Direct meaning from the lights

  • Direct specular through analytical lights & skylight

  • Needs lightmass to build indirect diffuse lighting (so it can sample it to calculate indirect specular)

HiddenPrimitives on FSceneView

https://forums.unrealengine.com/showthread.php?2964-Hiding-certain-objects-from-being-drawn-on-a-camera-or-SceneCapture2D-object&p=66113#post66113


Last update: November 14, 2019