clone method
data
- This object holds shared array buffers required for properly
cloning geometries with interleaved attributes.
Implementation
@override
InstancedInterleavedBuffer clone(InterleavedBuffer data) {
//if(data is InterleavedBuffer) throw('data must be InstancedInterleavedBuffer');
final ib = super.clone(data);
ib.meshPerAttribute = meshPerAttribute;
return ib as InstancedInterleavedBuffer;
}