Three.js: Feature request: support InstancedMesh.setOpacityAt(index,color)

[XiangLiLiang]

I want to set the opacity of each item by index , It's like InstancedMesh.setColorAt()

Additional context

I've found a way to do it ,but it's not work very well
https://discourse.threejs.org/t/instance-geometry-opacity/9164

[mrdoob]

I think adding per-instance opacity support to InstancedMesh brings more problems than it solves...

https://discourse.threejs.org/t/is-it-possible-to-set-varying-opacity-for-objects-inside-a-instancedmesh-filled-with-boxbuffergeometry-meshpongmaterial-cubes/19181/2

It’s not possible, mainly because if that was allowed the first thing people bump into is that the order in which transparent objects get renderer is incorrect.

In order to render them correctly the instances will need to be reordered every time the camera moves.

[Mugen87]

Yeah, I'm afraid this feature will be very "support-intensive"...

[XiangLiLiang]

I think adding per-instance opacity support to InstancedMesh brings more problems than it solves...

https://discourse.threejs.org/t/is-it-possible-to-set-varying-opacity-for-objects-inside-a-instancedmesh-filled-with-boxbuffergeometry-meshpongmaterial-cubes/19181/2

It’s not possible, mainly because if that was allowed the first thing people bump into is that the order in which transparent objects get renderer is incorrect.
In order to render them correctly the instances will need to be reordered every time the camera moves.

Thank you for your reply