Refraction texture limit per scene?

[Evgeni_Popov]

I did a performance snapshot in Chrome and got:

The green timeline is the GPU timeline.

It seems quite alike (even if it’s not in the same context):

Frame Drops on loaded GLB

The asset is using the KHR_material_transmission extension, which means we are creating a hidden RTT behind the scene to render opaque objects. You can force compiling the materials used by this RTT this way: You will see that when the car comes into view, there’s no new shader compilation, but it’s still stuttering. The performance snapshot is something like this on my computer: [image] It’s the GPU timeline that takes a long time when there’s stuttering… We’re not doing anything to ex…

I don’t know why the GPU would suddenly run continuously a whole 150ms at a specific point of time, and then continue normally…

Maybe there are some new visible parts of the scene that are using textures not used until that point that are only uploaded to the GPU at this moment, because the driver defered the upload?

To test this scenario, you could try to remove all textures from your scene and see if this fixes it.