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I try to bake the diffuse map of my box model in cycles render engine, but I get extremly weird results:

I made a short video: https://youtu.be/bwoLJ8psZ2E

  1. This is my model:

enter image description here

  1. it is a model which consists of multiple smaller models which I have joined at the end, thus it has multiple materials:

enter image description here

  1. First I created a new UV-Map and choosed Smart UV-Layout.

enter image description here

enter image description here

  1. Then I created a new texture in the UV-Panel

enter image description here

  1. Next I hit bake:

enter image description here

  1. This is the result:

enter image description here

  1. ...and if I select the original UV-Map then it looks like this now:

enter image description here

  1. I am not sure why this does not bake as expected.

If I do the same method with another model which has only one material, then it works without problems.

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  • $\begingroup$ What happens if you uncheck clear in the bake settings? $\endgroup$ – Brenticus Nov 30 '17 at 17:37
  • $\begingroup$ did you assign the new UV map to be used with the baked image? $\endgroup$ – user1853 Nov 30 '17 at 17:55
  • $\begingroup$ @cegaton, Im not sure, I did all the steps precisley like you see here or in the video. $\endgroup$ – Black Nov 30 '17 at 20:20
  • $\begingroup$ @Brenticus, clear is creating an alpha mask on every part which is not painted. $\endgroup$ – Black Nov 30 '17 at 21:01
  • $\begingroup$ On the step 2 try removing empty material slot $\endgroup$ – Mr Zak Dec 1 '17 at 13:37
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I solved it, I had to add the texture bakeResult0001 created at step #4 to each material as none connected image texture node, I also had to only check "color" in the bake settings, otherwise weird black spots were baked onto the texture.

enter image description here

I created a video: https://youtu.be/nOvtGUgWCA0

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