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Thanks for the attention :)

The critical part of the shader is this:

o.pos = UnityObjectToClipPos (v.vertex);

//Vertex snapping
float4 snapToPixel = o.pos;
float4 vertex = snapToPixel;
vertex.xyz = snapToPixel.xyz / snapToPixel.w;
vertex.x = floor((_HorizontalRes / 2) * vertex.x ...

Hello!

I'm working on a retro shader that emulates a lack of vertice precision, like how PSX behaved.
To do that, I need to manipulate coordinates in projection space. Is this possible using surface shader or custom lighting?

I managed to do that using a custom template, but then I couldn't use ...