Shader changes scene background colour

[dodgyville]

Hi, I love this shader a lot, you've done a great job. I can't quite get the effect the same though.

1. I create a 3D scene and a camera.

2. I place a quadmesh in front of the camera.

3. I add a material override with the shader attached, with purple highlights and blue shadows.

4. The objects in the scene get blue shadows and black outlines.
5. The background colour of the whole scene goes purple.

I was expecting the objects to get purple highlights or a purple outline but the background to stay the same colour. Do you have any suggestions maybe? This is godot 4.0

[leopeltola]

I never tested the shader with no background, seems like the normals start acting funny without meshes to collide with. Adding a distance check seems to fix this:

if (highlights_enabled) to if (highlights_enabled && getDepth(SCREEN_UV, DEPTH_TEXTURE, INV_PROJECTION_MATRIX) < 1000.)

This works but is suboptimal performance-wise. Shouldn't really matter since the rendering resolution is so low but I'll do a better version once I update the shader again.

Let me know if the problem persists