ReadonlyfirstThe source's first triangle in the group's geometry, and how many it has.
ReadonlyinputPosition in the instance array given to mergeStaticGeometry.
ReadonlyinstanceReadonlymaterialThe instance's material index, NO_MATERIAL for none. Assembly refuses the instance if its material differs.
ReadonlymeshReadonlymirroredThe transform's determinant is negative: the source's triangles carry the flip bit.
ReadonlyobjectThe transform the triangles were moved with (a copy). Assembly refuses the instance if its transform differs.
Readonlytriangle
One instance merged into a group.