feature request: Adding a fog effect for better depth/immersion?

[Mitia-RH]

First off, I’m a huge fan of viser. It’s been such a clean and helpful tool for my 3D workflows.

I was playing around with some scenes and thought it might be awesome to add a Fog feature—similar to how distance fog works in video games. When moving through large environments, it can sometimes feel a bit abrupt when objects hit the far clipping plane and just disappear.

Adding a configurable fog effect would be a great "quality of life" improvement because:

• It looks great: It adds a layer of polish and immersion to the viewer.
• Better Depth: It helps the eye naturally understand how far away objects are.
• Softer Edges: It masks the "popping" effect of distant objects.

I know viser is built on Three.js, so I was wondering if it might be possible to expose something like scene.fog through the Python API?
Even a simple linear fog where we can set the color and distance would be a game-changer!
Thanks for all the hard work on this library. Curious to hear what you think!

[brentyi]

Thanks @Mitia-RH! I'm open to adding this. I think we could add scene.configure_fog(near: float, far: float, color: RgbTupleOrArray), similar to scene.configure_environment_map(...).

Do you have time or interest in PRing? Or I could implement it fairly quickly if you can help test, particularly for cases like compatibility with our custom shaders (point cloud, Gaussian splats, outlines).

[Mitia-RH]

I’d be happy to handle the PR. I’ll start by looking into the configure_environment_map implementation and use that as a reference for the fog settings. I'll be working on this in my free time, so progress might be a bit gradual, but I'll reach out if I hit any snags with the custom shaders. Looking forward to contributing!