sceneInputs property
Per-frame engine inputs this material samples, produced only when a
visible material asks for them: RenderInput.depth binds the linear
scene depth of the opaque geometry (forcing the depth prepass), and
RenderInput.opaqueSceneColor binds the accumulated scene color behind
the current draw, and RenderInput.filteredSceneColor adds its
roughness-filtered atlas.
Together they enable refraction, depth-fade absorption, shoreline
foam, and soft-particle style effects on translucent surfaces. The
base material requests nothing; a .fmat material declares these with
engine_inputs:.
Implementation
@override
Set<RenderInput> get sceneInputs => _sceneInputs;