Why doesn't UIVertex.uv2 work?

Question

I was happy to see unity 2017 has a uv2 and uv3 channel, both in the canvas channel settings and in the UIVertex class, but these don't seem to actually work. They always seem to have zero values in the shader. Are they just a big tease or am I missing some way to make these channels work with ui shaders?

Answer 1

Answer by Jon-Manning · Jan 12 at 05:29 AM

The second UV set in a UIVertex is actually uv1, not uv2. The first set is uv0. Are you trying to work with the third UV set (which is called uv2) by mistake?

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Answer 2

Answer by quizcanners · Feb 01 at 03:36 PM

Tested on Unity 2018.3.3 and 2018.2.9.1. I can read Tangent, Normal and UV1 (Second set of UV coordinates), but unable to read UV2 and UV3 - their values are always 0.

Canvas Renderer is set to pass Everything.

I did some search and maybe there is a workaround somewhere that I missed, but so far it seams to be an issue in current (and maybe older) Unity versions. Will submit an issue.

I was unsure if this should be an answer or a comment but it may be worth knowing. It took me quite some time searching for a solution.

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Why doesn't UIVertex.uv2 work?

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