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I imported object from AutoCAD and did UV mapping for it using cube projection, the texture has tiles, I simulated the problem using the color grid texture in below screenshots, it is expected that the mapping will be continuous along each side but it's not, it seems there are UV islands that make the texture stop at certain edges (there is no seams at all), I tried also the plugin Magic UV with same results, how can I make the texture continuous?

Note: I have many objects and most of them are complicated to do manual unwrap, so I prefer doing it with box UV mapping to save time.

Link to blender file: https://we.tl/t-yGQRw3MKvI

Attached screenshots of the problem:

[Texture is not continuous at some places1

Texture is not continuous at some places

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    $\begingroup$ you need to add seams to your model. it's not possible to have it continuous on every edge. where do you want the seams to be located? select the edges you want to be as seam and do Ctrl+E and select Mark Seam and then Unwrap your model again by going into Edit Mode and selecting everything with A and then press U > Cube Projection $\endgroup$ Jul 13, 2022 at 8:11
  • $\begingroup$ and you might want to scale up your model, it's really small at 0.129 x 0.0925 x 0.2 meters $\endgroup$ Jul 13, 2022 at 8:18
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    $\begingroup$ Cube Projection will project on the 3 axis, so it's normal that the texture is discontinued $\endgroup$
    – moonboots
    Jul 13, 2022 at 8:24
  • $\begingroup$ @HarryMcKenzie I tried to add seams but when doing the cube projection the texture is uncontinuous in places that don't have a seam (the clouded areas in the screenshots), I know it cannot be continuous on every edge but it should be continuous on every plane (plane projection xz or yz for example should be continuous because it's a box projection, but not when we cross the planes), I think it's something to do with the structure of the object itself not the UV map, because the texture is cut at edges where there is no seam existing, I think these edges are same isolines in the AutoCAD file) $\endgroup$
    – Sh30
    Jul 13, 2022 at 9:18
  • $\begingroup$ @moonboots yes normal between axis planes but not in same plane (xy for example) $\endgroup$
    – Sh30
    Jul 13, 2022 at 9:19

1 Answer 1

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You could select all the side faces and, as they are tris, convert to quads with Face > Tris to Quads:

enter image description here

Then keep the faces selected, shift select one face and press U (Unwrap) > Follow Active Quads:

enter image description here

Now you'll have a continuous texture all around the side:

enter image description here

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  • $\begingroup$ I tried the steps but I think I am missing something, in "follow active quads" did you choose "length"? I still have 2 directions for the texture, instead of A7,A8,A1,A2 in your image I have them rotated 90 degrees. Also, if this worked, it will solve the problem of same length side faces, but if sides have variant length it will not work, right? $\endgroup$
    – Sh30
    Jul 13, 2022 at 17:49
  • $\begingroup$ Length is probably the good option, and I'm not sure why it doesn't work for you, have you convert all the tris to quads? Also the result seems correct to me $\endgroup$
    – moonboots
    Jul 13, 2022 at 18:10
  • $\begingroup$ yes I converted them to quads, what type of unwrap did you do? cube projection? I still have 2 directions, I tried many things but the middle parts are always in another direction, I attached an image here: we.tl/t-H7Uy5pieW9 $\endgroup$
    – Sh30
    Jul 14, 2022 at 22:02
  • $\begingroup$ How does cube projection work? isn't supposed that it will automatically map the whole side in one direction correctly? $\endgroup$
    – Sh30
    Jul 14, 2022 at 22:04
  • $\begingroup$ Cube Projection will project the texture depending on the face normal, so the texture will be discontinued as soon as a face is considered as oriented towards Z instead of towards X for example. As for your UV that is cut in two parts, I'm not sure what's happening, could you please share your file? $\endgroup$
    – moonboots
    Jul 15, 2022 at 2:51

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