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I have defined 2 uvmaps on one object. I assigned different materials with the same color but different images. For some reason only one is showed up - why?

As you can see, the 1st UV works just fine:

enter image description here

But the other one on opposite site does not show up at all!

enter image description here

Here is my test file.

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You have not plugged anything into the Vector input of the Image Texture node. Without any input, it uses the default UV map which is set to Active Render, in your case this is the one named "g1" (and it can always be only one single map be set to active).

active uv map

To use different UV maps for different textures, you can for example take a UV Map node, select the desired map there and plug it into the Vector input of the Image Texture node:

uv map node

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  • $\begingroup$ Yes, that made the job nicely, BUT now it shows just red rectangle in the Preview panel in the material tab - why? Before it was showing the image with correct red bg (you can see it on the image in my question post). $\endgroup$
    – fafa
    Commented Oct 13, 2023 at 13:22
  • $\begingroup$ @fafa Honestly I don't know how the material preview handles different UV maps and me personally never care much for those previews - as long as I have setup the materials correctly and they are working when I render my scene, that's the only thing important to me. I just made a test: I created a third UV map just with default unwrapping which has ALL faces unwrapped over the map. If I plug this in, the preview looks like before. I guess it has something to do with the preview not really being the actual object and having some kind of default UVs for showcasing, too. But I don't know. $\endgroup$
    – Gordon Brinkmann
    Commented Oct 13, 2023 at 13:46
  • $\begingroup$ No problem, to be clear it is not important for me as well but I just wanted to know what is going on with the preview. But I have another problem regarding exporting to Collada, gonna make new post - gee this Blender! ;-) $\endgroup$
    – fafa
    Commented Oct 13, 2023 at 13:48

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