Three.js: Matrix added to instance mesh on subsequent frame doesn't work

[TheBunyip]

I found that if I try to add another instance to an InstancedMesh on a frame(?) after the one on which the InstancedMesh is created, the second instance it doesn't appear.

http://jsfiddle.net/vm4zpdx1/2/

[Mugen87]

Updated fiddle: http://jsfiddle.net/d4oq5ahx/

If you modify instanced data, you also have to set InstancedMesh.instanceMatrix.needsUpdate to true.

Please use the forum or stackoverflow if you need more help.

[TheBunyip]

Ah OK. The documentation says this..

.instanceMatrix : BufferAttribute
Represents the local transformation of all instances. For internal use only.

[Mugen87]

Yes, the documentation should be better in this case. How about:

Represents the local transformation of all instances. You have to set its needsUpdate flag to true if you modify instanced data via [page:.setMatrixAt()].

[Mugen87]

Let's give this a try.