GroupOpacity
constGroupOpacity:BuiltinComponentDef<GroupOpacityData>
Defined in: sdk/src/ecs/component.ts:1038
Fades this entity and everything under it: the opacities multiply down the hierarchy into each descendant’s own alpha,
the way UINode.opacity does for a UI subtree. It is not a composited layer — overlapping children show through one
another mid-fade.