Tell a physical mesh whether its committed colours carry alpha.
MeshMetadata records has_colors but not the component count, and the node is
created before any fetch, so translucency-by-vertex-alpha can only be decided on
the commit that carries the buffer. A no-op for a house material (which reads
per-vertex alpha in its shader regardless) and when nothing changed.
Tell a physical mesh whether its committed colours carry alpha.
MeshMetadatarecordshas_colorsbut not the component count, and the node is created before any fetch, so translucency-by-vertex-alpha can only be decided on the commit that carries the buffer. A no-op for a house material (which reads per-vertex alpha in its shader regardless) and when nothing changed.