Optional ReadonlyindicesThree vertex indices per triangle; omit for an unindexed triangle list.
Readonlypositionsx, y, z per vertex, tightly packed.
Optional ReadonlytriangleOptional per-triangle bit flags, indexed by the original triangle number
(see TRIANGLE_FLAG_FILTER). Defaults to 0.
Optional ReadonlytriangleOptional per-triangle material (0-65534, 0xffff for none), by original
triangle number; a hit without one takes its instance's material
(MeshInput.triangleMaterials).
Triangle geometry in object space.