Object mapping not uniform on all surface with procedural texture - how to resolve it?

Support Materials and Textures
1

I am noticing scaling difference with procedural texture while using object/generated mapping with geometric object. The rounded edges have noticeably different scaling. Is there any way to resolve it?

Here is what I mean:

object%20mapping%20not%20uniform%20on%20all%20surface%20with%20procedural%20texture
object%20mapping%20not%20uniform%20on%20all%20surface%20with%20procedural%20texture1291×2001 398 KB

Please let me know if you need any other info or the scene file.

2
  1. Add some arbitrary values into the location of the mapping node. Some generators can behave oddly around origo, although I don’t think noise is on of them.
  2. I’m assuming scale have been applied to the object(s)?
    If not, yeah, I’d like to have a look at the scene file.
3

Thank you for the reply.
I have tried both. and it doesn’t seem to help! :frowning:

Here is the blend file in case anyone wants to look into it:
Blender 2.80 object mapping procedural texture issue.blend (152.6 KB)

4

Try putting in some random rotation values. Appears perlin noise get a bit wacky when lookup volume is exactly normal to the surface. I’m not sure.
I’m getting similar but less issue with Musgrave (which I prefer over noise for bump purposes), but random rotation helps there as well.

Noise_Planar_Issue
Noise_Planar_Issue2560×1532 977 KB

5

The random rotation and musgrave combo is much better! Thank you. Really appreciate it.
Do you think this is a bug with 2.8 by the way? because I never noticed such issue with 2.7x…

6

just a note here
images are 2D and curved models are 3D

there will always be some distortion on the curved 3D model from 2D image projection
that is how it is !

7

You can have a 2D curved surface.
What does 2D image projection have to do with what the topic is about; procedural texture?

@saiko: I don’t know. I know heavy repetition of noise can cause issues, but I can’t recall having seen this.

8

Just did a quick test in 2.79, saw your 2.8 issue. Does suggest a problem with the noise implementation if no rotation just happens to give weird looking output. Too perfect of a coincidence. But the workaround is simple enough I, personally, wouldn’t bug report it.

9

in blender procedural texture have several predefined method of projection
like cube cylinder sphere
and In any type of projection from 2D to 3D there will always be distortion !

happy bl

10

@RickyBlender: It seems you are mixing up 2D image projection and procedural texture - they are not the same! That’s why you don’t need to unwrap UV for procedural textures.

@ bandages : thank you for confirming it, at least I am not the only only one noticing this issue! are you talking about the same workaround as CarlG?

@ CarlG thank you for the tip to minimize it - I won’t have figured it out easily.

11

Yup, just a bit of rotation (in two axes) fixes it.