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Old 03-03-2013, 10:40 PM   #1
phatwheels
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distortion in textures

Hi,

pretty new to the modelling, but this is first time i've come across this problem and i've used textures a fair bit up to now.

see screenshots - basically its a bottle top, with a texture in the centre top. but its gettin distorted as you'll see on the screenshot, why is this and how do i fix it please?

I read somewhere that i can fix it in BP UV edit, but then couldn't find any good tutorials to guide me through, would this be the right way to fix?

hopefully this is simple to fix!

render with problem


texture tag settings


wire
 
Old 03-04-2013, 07:14 AM   #2
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Hi, don't use UVs but camera projection. That will apply the logo without any distortions. If need be you can then convert the camera projection to UVs.
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Old 03-04-2013, 07:54 AM   #3
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Sébastien Florand
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Or flat projection will work as well.
Anyway, looks like it's distortions coming from the Hypernurbs. Set your UV subidivision mode (in the Hypernurbs) to Edges or Boundary, it will get rid of these artifacts.
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Old 03-04-2013, 04:11 PM   #4
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We brought that subject up in this thread:
http://forums.cgsociety.org/showthr...?f=47&t=1096246

Seems to be difficult to avoid distortion when generating UVW...
I'm keen finding a work around.
 
Old 03-04-2013, 04:36 PM   #5
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I think your problem is different. I wouldn't mind getting my hands on your file (even a piece of geometry showing the problem) to troubleshoot it, though.
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Old 03-04-2013, 05:16 PM   #6
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Thanks for the replies, im going to try out Srek and fluffouille's solutions now and see how they turn out.

I did find another solution lastnight however, similar to what fluffouille said - i noticed it was the hypernurbs causing the distortion, so i deleted the centre/top of the bottle top where the logo was to sit, made the hypernurbs editable and did a 'close polygon hole' on the top, this meant i'd got a clean surface to put my logo on.

Nice bikes by the way Srek - saw them on Bonkers.de
 
Old 03-04-2013, 05:53 PM   #7
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Given that the top of the bottlecap is flat...
If you really want to UV unwrap it you could set it to a flat projection first, then only relax the outer edges so the center remains undistorted.
You could also try retopologizing the top so it doesn't create that pole in the middle. That isn't exactly texture/HyperNURBS friendly...
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Old 03-05-2013, 08:07 AM   #8
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Quote:
Originally Posted by fluffouille
(…)I wouldn't mind getting my hands on your file (…)


Hi fluffouille

I attached 2 scenes. One is directly based on Aurety's workshop.
So far, it seems to be related to the subdivision.
Even in Aurety's exercice the distortion appears (base of the statue). I suspect an error on my side, though...
Attached Images
File Type: jpg screenDistortion_UVWgen.jpg (49.1 KB, 25 views)
Attached Files
File Type: zip CameraExtraction_Distortion.zip (138.6 KB, 8 views)
File Type: zip CameraExtraction_Distortion2.zip (244.1 KB, 6 views)

Last edited by klueck : 03-05-2013 at 08:10 AM.
 
Old 03-05-2013, 03:05 PM   #9
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Well I'm stumped. The UVs look exactly the same for both UVW and Camera mapping modes, yet the UV mapped texture is all skewed along the hidden triangles of each face.
Short of subdividing the mesh, I can't find a solution.

I'll keep digging, and take it up directly to Maxon.
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Old 03-05-2013, 03:47 PM   #10
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Ok. Should I take it to Maxon also?

I had a terrible editor view of my UV mapped object. Like new polygons between unconnected points. Trying to get the same scrambled scene again for a screen shot...

En attandant: merci
 
Old 03-05-2013, 03:51 PM   #11
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Yes, feel free to report the issue as well.
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Old 03-05-2013, 04:21 PM   #12
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I had an answer from an expert, I replied in your initial thread to avoid hijacking this one further.
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Old 03-05-2013, 04:21 PM   #13
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