OptionalcastInitial Renderable.castShadow; defaults to true (§69).
OptionalclipInitial Node.clip; defaults to false (§67).
Here rather than on a Node options record because a clip is only
meaningful on a node that draws — the mask is the node's own geometry —
and this is the options record every drawable funnels through. It is also
what gives the §79 readers one spelling for the field beside the three
§49 flags above.
OptionalfrustumInitial Renderable.frustumCulled; defaults to true (§87).
OptionalreceiveInitial Renderable.receiveShadow; defaults to true (§69).
OptionalrenderInitial Renderable.renderLayer; defaults to 0.
OptionalrenderInitial Renderable.renderOrder; defaults to 0.
OptionalscissorInitial Renderable.scissor; defaults to null (§67).
A per-draw axis-aligned rectangle in drawing-buffer pixels. null (the
default) leaves the view scissor alone, so existing scenes stay
transcript-identical. See scissor.ts.
Optional construction arguments of Renderable.