Optional ReadonlyalphaOptional ReadonlyblendOptional ReadonlycompositionP5 renders into linear scene color before Bloom; other policies fail at compile time.
Optional ReadonlycoverageOptional ReadonlydepthOptional ReadonlydepthOptional ReadonlylightingOptional ReadonlyrenderOptional ReadonlysortOptional Readonlytexture
Shared controls for non-sprite particle surfaces.