GeezerVison

what about the overlay?

Good point, you may want to use a different depth range in the camera, so that the fragments all have a very small depth value, so they don't get behind stuff in the scene. Or simply disable depth-tests.

Or you can clear the depth buffer again, if you don't need it for post processing or things like that.

What are depth tests? Is there a performance difference between this or clearing again? What's your recommendation, I'm not too familiar with how the depth buffer works in this context, only how it's important for knowing what objects are above what in a 3D scene. Eventually the overlay scene will probably have axes when using an orthographic projection, along with legends etc.

The depth test makes sure that objects are not occluded by objects that are behind it (but are rendered later).

The depth buffer needs to be cleared before using it, otherwise the depth test makes no sense. Since there is an underlay pass and an overlay pass, we need extra manual clears.

I added a clear before the overlay pass. That's definitely the simplest solution. The only caveat is that if users want access to the depth buffer (of the scene) they can't because the depth buffer will represent the content of the overlay. If we ever want to change that, we can look into that later. There are more upcoming changes in pyfx that will likely make that easier.

The only caveat is that if users want access to the depth buffer (of the scene) they can't because the depth buffer will represent the content of the overlay. If we ever want to change that, we can look into that later. There are more upcoming changes in pyfx that will likely make that easier.

do you want to make a note of it in the pygfx issue if you don't have this planned already?