[Godot 4] How to offset vertices away from the camera in Visual Shader?

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I am drawing an outline using the typical grow + front face culling + unshaded technique. However, I'd like to get rid of lines that are not part of the silhouette.

I figured it'd happen if I offset the geometry away from the camera.
The problem is - I was unable to figure that out in the vertex shader.

I am working with visual shader, but if something can be done with an expression there that'd be fine.

One pitfall here is that the offset vector I need is not just the Z axis of the camera - it's a ray from the camera center towards the vertex being considered - the angle here can vary.

Otherwise my outlines would be pushed towards the center of the frame.

I was trying to figure something out with transforms but no go so far. The best I could do was working only when looking from a certain direction.

Godot version Godot 4 Beta 3
in Engine by (217 points)

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