Adding meshPhysicalMatreial to create a glass like semi transparent material drops the the performance

[bhushan6]

I have a small model with glass material, where I am using physical material to create semi transparent mesh but it causing big performance hit, fps drops to around 30 and if i remove that model it runs at 55-60fps. I am using 13 numbers of that model(instanced mesh).

here is demo

you can see that model in picture, its on top of table

[drcmda]

It's the most expensive material that threejs has to offer. I think performance is dependent on the scene, it's probably double rendering. I'd post this on three discourse.