Why is my texture distorted on my spiral staircaise ? I make "follow active quads", try every options of texture coordinates.
Thanks ! 
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$\begingroup$ Hello could you please pack your image and share your file? $\endgroup$– moonbootsMar 6 at 17:21
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$\begingroup$ Thanks ! i add it $\endgroup$– Marilux FiorenzaniMar 6 at 17:28
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1 Answer
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A face is made of 2 triangles, if you unwrap with the Follow Active Quads option, the UV faces will be deformed compared to the original faces, and it will stretch slightly these 2 inner triangles, which will create this distortion in the face (the green line shows the separation between the 2 triangles):
To fix that, subdivide your mesh enough (here, see the loopcuts I've created in only one direction) so that the inner triangulations (inside each new face) become unnoticeable:
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$\begingroup$ Thanks ! ça m'avait complétement échappé ! $\endgroup$ Mar 6 at 17:44
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$\begingroup$ and, how can i do for having my texture straight and not curved ? $\endgroup$ Mar 6 at 21:05
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1$\begingroup$ you can't with this method, as your stairs are curved, you need another way $\endgroup$ Mar 7 at 3:49