The only shader that allows me to project onto a transparent material is the RenderFX/Skybox shader. This is exactly the behavior I want. However is this a bug and will it work on all video cards?
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Just edit whatever actual shader you want to use, to not use the IgnoreProjector tag.
Ok thanks this should be a rather simple shader then. Just needs a alpha channel.
I modified the unlit transparent cutoff shader. I think that should be the fastest