GeometryNodes

Artistic Support Animation and Rigging
1

Hello,
I am trying to create some details on the surface of an animated character using geometry nodes.
I want the details to to change smoothly with the noise node.
My current problem:
As you can see, the movement of the character affects the visibility of the details. They don’t appear and disappear smoothly, especially when the character is moving fast, you can clearly see this issue.
Do you know what I need to change?

This is my current node tree:

02
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2

Try placing your Geometry nodes modifier before the armature modifier. Since the position is being changed by the armature, it’s causing the noise texture to fluctuate. If you put it above, the geometry nodes will just work on the base geometry.

3

But then the character isn’t moving anymore / goes into base pose. Did I missed something?

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031600×1031 299 KB

4

You need to use 2 geo nodes modifiers for that

1st geo modifier before armature modifier to set attribute

m1.PNG
m1.PNG1291×853 131 KB

And 2nd modifier to use that attribute as texture vector, and your nodes setup

m2.PNG
m2.PNG1291×965 150 KB

5

Hi Felix,

Have you considered By-Gen (free) by Curtis Holt? You can do some really cool stuff with it and it seems quite close to what you are trying to do. I think its a great learning tool also. His new Generator’s Lab [$] is very interesting too (this expands By-Gen’s functionality).

Cheers and happy blending!

6

Thanks for your reply but that makes no difference for the animation. So it looks still the same. Isn’t there a way to connect the noise node to some UV based geometry?

7

I watched some of his tutorials and I m pretty sure that I can learn a lot from him but the content you sent me looks more like styliced non-animation content and I need to solve a very specific issue that exist only on an animated character.

8

It should work with 2 modifiers, can you show the setup?

Yes you can just use UV as texture vector

image
image1278×876 127 KB

9

Now I m back at this project. I followed your advices - second geometry node modifier with position node and so on. Maybe I got it not quit right. It doesnt worked. In general I dont understand why there is such a mapping difference between MaterialNodes and GeometryNodes:

Even if in the ShaderEditor isn`t a TextureCoordinateNode included, the noise texture is fixed to surface of the character. That is the result I like to go for in the GeometryNodes: Fixed objects in a noise pattern on the surface.

So if someone like to check out my file, I would be pleased. (I deleted the second GeometryNode modifier):
https://drive.google.com/file/d/1YOlW75du0hlUrAZLE_wapwEvW55FTyGh/view?usp=sharing

10

Here is setup with 2 modifiers

dance.PNG
dance.PNG1890×1020 252 KB

By default in Shader editor textures using Generated Coordinates and it seems that those coordinates are calculated on the base mesh that ignors deform modifiers but I am not 100% sure

If you want have same coordinates in shader editor and in geo nodes use Object coordinates in shader editor

11

Thank you so much!!

12

I think by mistake I chosed in the GeometryModifierSettings the option “position” instead of creating a custom position vector name called “pos”. But now I got it and it works :slight_smile: