How to scale and offset UV at editor time through script

Hello,

I want to use ProBuilder to scale and offset its UV's so that I don't have to create different materials for every object. This is something ProBuilder can do through its UV editor interface but I want to do it with a component that I attach to the gameObject, so it's quick and easy to modify.

How can I scale and offset UV's through script?
Thanks for any help.

 

Hi,

I work on very simple meshes, so I'm far from being good at this, but first of all, I think you need to study how UVs are stored in ProBuilder.
I think you should start with building a simple quad, opening the UV editor and running this editor code:

Code (CSharp):

1. List<Vector4> uvs = new List<Vector4>();
2.  
3. pbMesh.GetUVs(0, uvs); // pbMesh is your ProBuilderMesh object.
4.  
5. foreach (Vector4 uv in uvs)
6. {
7.      Debug.Log(uv);
8. }

so you can see how it's made.

Then, I don't know if this is the proper or best way to do it, but so far it's been working fine for me:

Code (CSharp):

1. List<Vector4> UV = new List<Vector4>(); // new UVs
2.  
3. // First, set UVs to manual. pbMesh is your ProBuilderMesh object.
4. foreach(Face f in pbMesh.faces)
5. {
6.     f.manualUV = true;
7. }
8.  
9. //Then, build your UVs structure
10. UV.Add(new Vector4(someX, someY)); // z and w coordinates are unused.
11. // (...) and so on
12.  
13. // Apply UVs
14. pbMesh.SetUVs(0, UV);
15. pbMesh.Refresh();
16.  

Hope that helps.