Switch between uv and uv2 on one texture

Question

I have a simple model that is made from 1 quad. UV1 is mapped to one area of the texture and UV2 is mapped to a different area on the texture. Unity displays the object using UV1. During game play I would like the object to sometimes use UV2 as the texture mapping for t$$anonymous$$s object. How do I tell unity to temporarily use UV2 instead of UV1?

Answer 1

Best Answer

Answer by Lance Sun · Dec 09, 2009 at 02:18 PM

MeshFilter meshFilter = go.GetComponent<MeshFilter>();
Mesh mesh = meshFilter.mesh;
Vector2[] temp = mesh.uv;
mesh.uv = mesh.uv2;
mesh.uv2 = temp;

Note that t$$anonymous$$s will cause a copy of the mesh to be created, and the engine will create a new VBO to put the data into.

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Answer 2

Answer by Jaap Kreijkamp · Dec 09, 2009 at 07:20 AM

Unfortunately t$$anonymous$$s is less trivial than it sounds. It can be done in several ways, for example using a script that sets the mesh.uv to the mesh.uv2 set or using a custom shader that can switch between the meshes. An easier method, assuming you don't have a really weird mapping is instead of using 2 uv sets just use one and use texture positioning to switch to different parts of the texture. To give an example:

using UnityEngine; using System.Collections;

public class UpdateTexture : MonoBehaviour {

 public Material background;

 void SetVerticalOffset(float verticalOffset) {
 Vector2 offset = new Vector2(0f, verticalOffset);
     background.SetTextureOffset("_MainTex", offset);
 }

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ibyte · Dec 09, 2009 at 03:30 PM 0

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While I accepted the answer below I think I will end up using your approach. Thanks

Switch between uv and uv2 on one texture

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