There was a weird white line at the edge of my sphere UV when I import texture with mipmap
It disappear when I disable mipmap
What is this?
This is the texture I used
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It might be helpful to see your original texture? – VPellen Apr 06 '19 at 13:25
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@VPellen OK I have added – Thaina Yu Apr 06 '19 at 14:49
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I can't seem to reproduce the problem. It might be an issue with the mesh? It looks like a custom UV sphere rather than the default one. – VPellen Apr 06 '19 at 15:03
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@VPellen That's right I make my own custom sphere. The UV was generated as 0 to 1. Was it related to mipmap? – Thaina Yu Apr 06 '19 at 15:08
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I think it might be an issue with your UVs rather than just the texture, but it's hard to tell. – VPellen Apr 06 '19 at 15:12
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The problem lies on the fact that I was generate per pixel UV in shader
https://forum.unity.com/threads/strange-line-artifact-when-doing-1-on-uv-coordinates.544118/
But that's not the problem itself. The point is I need to specified LOD with texture2D sampler LOD when it is a custom per pixel UV. Or else it could has a confusion mipmap between UV 0.99 and 0.01
Thaina Yu
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To make this work with per-pixel UV coordinates, you have to provide custom uv derivatives (see the Tex2D overload that takes custom dx and dy derivatives https://developer.download.nvidia.com/cg/tex2D.html) – matthias_buehlmann Sep 28 '20 at 14:07