UITexture.uvRect affects all textures in a material, not just mainTex

[madruse]

When modifying an UITexture's uvRect, ALL textures in a material are affected.  I assume for most people this is fine, but my UITexture has a custom shader that takes 2 texture inputs, one for diffuse, one for an alpha mask clip.  When animating the UITexture's uvRect, the mask also animates. 

How do I only animate one texture's uv offset?

This is super simple outside of NGUI because I can specify which texture I want to offset, with NGUI you can not.  Feature request?

I'm using NGUI 3.7.3

[ArenMook]

When you modify the UV rect, it changes the vertex texture coordinates. I don't know what you're doing in your shader, but my guess is that you are using them as-is.

Create a custom uniform float2 then set it on the material via the texture's onRender callback.

[madruse]

Here is the shader:

1. Shader "TextureMaskMultiply"
2. {
3.    Properties
4.    {
5.       _Color ("Main Color", Color) = (1,1,1,1)
6.       _MainTex ("Base (RGB)", 2D) = "white" {}
7.       _Mask ("Culling Mask", 2D) = "white" {}
8.       _Cutoff ("Alpha Cutoff", Range (0,1)) = 0.1
9.    }
10.    SubShader
11.    {
12.       Tags {"Queue"="Transparent"}
13.       Lighting Off
14.       ZWrite Off
15.       Color [_Color]
16.       AlphaTest GEqual [_Cutoff]
17.       Blend SrcAlpha OneMinusSrcAlpha
18.       Pass
19.       {
20.          SetTexture [_Mask] {
21.             constantColor [_Color]
22.                 combine texture * constant
23.          }
24.          SetTexture [_MainTex] {
25.             combine previous * texture
26.          }
27.       }
28.    }
29. }
30.  

Create a material using this shader with a texture and a mask texture.
Then create an UITexture in your GUI that uses the material you created.
Then animate the uvRect:

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class NGUIAnimateUV : MonoBehaviour {
5.        
6.         public UITexture UITextureRef;
7.         public Vector2 ScrollSpeed = new Vector2(0.5f, 0);
8.  
9.         private void Update() {
10.                 if (UITextureRef) {
11.                         UITextureRef.uvRect = new Rect(Time.time * ScrollSpeed.x % 1, Time.time * ScrollSpeed.y % 1, UITextureRef.uvRect.width, UITextureRef.uvRect.height);
12.                         UITextureRef.MarkAsChanged();
13.                 }
14.         }
15. }
16.  

Both the texture and the mask animate.

How do I only animate the texture and not the mask?
If I try to access the UITexture's material and set the texture offset, it offsets once, but does not animate.

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class NGUIAnimateUV : MonoBehaviour {
5.        
6.         public UITexture UITextureRef;
7.         public Vector2 ScrollSpeed = new Vector2(0.5f, 0);
8.  
9.         private void Update() {
10.                 if (UITextureRef) {
11.                         Vector2 offset = new Vector2(Time.time * ScrollSpeed.x % 1, Time.time * ScrollSpeed.y % 1);
12.                         UITextureRef.material.SetTextureOffset("_MainTex", offset);
13.                         UITextureRef.MarkAsChanged();
14.                 }
15.         }
16. }
17.  

Maybe I'm not going about this the right way? Is there a better way?  Might be a question for a different forum.

[madruse]

Here is how I'm animating it outside of NGUI and it works fine, but I can't layer it in with my GUI.

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class AnimateUV : MonoBehaviour {
5.         public Vector2 ScrollSpeed = new Vector2(0.5f, 0.5f);
6.  
7.         private void Update() {
8.                 if (renderer) {
9.                         Vector2 offset = new Vector2(Time.time * ScrollSpeed.x % 1, Time.time * ScrollSpeed.y % 1);
10.                         renderer.material.SetTextureOffset("_MainTex", offset);
11.                 }
12.         }
13. }
14.  

[madruse]

I noticed in 3.7.3 that you added a texture mask to panels.  So I tried going with that using the mask on the panel, then set my UITexture to just use the Unlit/Transparent Colored shader.  This works, but now the UITexture, in the texture masked panel, ignores the tiling which is x:40, y:22.5 in my material.    But changing the uvRect width/height worked.