Uv map break in octane material

[baghbanikm]

why in my render
uv map deform in far segment ?

[aoktar]

Sorry but did you check the uvw in viewport/renderer with a standard material?

[omardex]

Hi, If you are using Sds to smooth your geometry make sure that the subdivide Uv is set to edge, if not stretch like that happen.

Annotation 2019-10-08 120152.jpg (10.44 KiB) Viewed 3318 times

if is not that, check the projections in the object manager for your material, or the projection node in your octane material textures if it exist. and make sure that are set to mesh uv and/or uvw mapping projection

[baghbanikm]

Sorry but did you check the uvw in viewport/renderer with a standard material?

i cant believe, also in c4d render is not ok

[baghbanikm]

Hi, If you are using Sds to smooth your geometry make sure that the subdivide Uv is set to edge, if not stretch like that happen.

Annotation 2019-10-08 120152.jpg

if is not that, check the projections in the object manager for your material, or the projection node in your octane material textures if it exist. and make sure that are set to mesh uv and/or uvw mapping projection

thank you .
but i didnt use ss in this object

[baghbanikm]

Project file

https://www.dropbox.com/s/5lax2bapryaeb ... n.rar?dl=0

[frankmci]

Compare your actual geometry to your UV space. Notice how your poly rings are evenly spaced, yet in your UVs, they are clustered closer to the rim. You need to adjust, or probably more simply, re-project your UV mapping so that you are not introducing distortion.

The distortion you are seeing.

Your current Polys on Left, UVs on Right. (No texture for the sake of clarity.)

1:1 Polys to UVs, no distortion

[baghbanikm]

Compare your actual geometry to your UV space. Notice how your poly rings are evenly spaced, yet in your UVs, they are clustered closer to the rim. You need to adjust, or probably more simply, re-project your UV mapping so that you are not introducing distortion.

UV Stretch.jpg

Screen Shot 2019-10-08 at 3.49.39 PM.png

Screen Shot 2019-10-09 at 9.12.48 AM.png

Thanks a lot