I have a flat face (created by bisect fill) that I have to unwrap for using with image that must be pixel perfect(no compress or shear).

What I have done are:

  1. Select bisect filled face

  2. UV>Unwrap it gives me this, notice there are some lighter triangle.

UV unwraped face

  1. And when I applied texture for it I got this (you can ignore gray square in the image) What I got after I add texture to it It is supposed to be a smooth gradient texture, but it looks like some part of image is cut or fold somehow.

  2. I tried to fix it by using relax tool in blender which remove white triangle from this first image, but, it makes things worse when I apply texture instead. no more white triangle worse, not smooth gradient at all!!

I'm new to blender and may be asking a silly question. I've been struggling on this for 3-4 weeks now, I've searched everywhere, but I can't find any post relate to my issue. I don't know what else to do, so I turn to this community. Please help me.

Updated #1: I found that we can manipulate mesh.uv using bpy scripting. Is there a way using that?

  • $\begingroup$ Don't use concave polygons. Cut it to smaller convexes or triangulate the face. $\endgroup$ – FFeller Nov 3 '19 at 17:46
  • $\begingroup$ Thank you I'll try that. In addition, I've some experienced with bpy scripting and found that you can manipulate mesh.uv yourself is there a way around this? $\endgroup$ – Zen3515 Nov 3 '19 at 19:06
  • $\begingroup$ @ FFeller thanks for your suggestion I've tried triangulate face too, however, the problem presist. it is only solved by using smart UV project. $\endgroup$ – Zen3515 Nov 4 '19 at 4:19

I figured it out!

It's turn out that in order to achieve the result I want, I must use smart uv project instead.

I believe that the cause of this problem is that normal unwrap does strech the texture a little, while smart uv project doesn't

Normal unwrap result:

Normal unwrap

Smart uv project result:

Smart uv project

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