some ways to reduce ue4 shader permutation count

UE4 Shader Count

ShaderPermutationCount for a material = VertexFactory Count * ShaderType Count * Quality Level Count

Optimize VertexFactory

…

Optimize ShaderType

remove unused lightmappolicy

enable shader permutation optimziations in project settings

disable static lighting?

Optimize Quality Level

drop unreal’s scalibility, use sample count controlled by shader parameter instead of QUALITY_LEVEL_1/2/3

e.g. SHADOW_QUALITY