Spin a texture in just any material -is it possible?

Question

I was just looking for more ways to UV animate textures, but with limited success. All I want to do is access the matrix and spin it. I don't know if most shaders support modifying the matrix, but I just wanted to check and make sure I wasn't missing something. I would really just like to be able to modify any material in general.

Here is the code I've been messing with:

var mtrx:Matrix4x4; private var okString:String; var spinme:Material;

function Start() { mtrx=spinme.GetMatrix("_Rotation");

}

function Update() {

var rot=Quaternion.Euler(Time.time*30,Time.time*30,Time.time*30);

mtrx=Matrix4x4.TRS(Vector3.zero,rot,Vector3(1,1,1) ); spinme.SetMatrix("_Rotation",mtrx);

}

Answer 1

Materials are supports matrix deformations, but shader should support it too. by default, shaders are doesn't. so you need a little shader modifications to do it.

example shader that supports texture matrix deformations

Shader "Unity Answers/Diffuse with material matrix" { Properties { _MainTex ("Base (RGB)", 2D) = "white" {} } SubShader { Tags { "RenderType"="Opaque" } LOD 200

     CGPROGRAM
     #pragma surface surf Lambert
 
     sampler2D _MainTex;
     float4x4 _Matrix0;

     struct Input
     {
         float2 uv_MainTex;
     };

     void surf (Input IN, inout SurfaceOutput o)
     {
         fixed4 c = tex2D(_MainTex, mul(_Matrix0, float4(IN.uv_MainTex, 0, 0)).xy);
         o.Albedo = c.rgb;
         o.Alpha = c.a;
     }
     ENDCG
 }
 Fallback &quot;VertexLit&quot;

}

example script that deformates texture using matrix

using UnityEngine;
using System.Collections;
public class Matrix2Material : MonoBehaviour
{
    public Material Material2SetMatrix;
    void Update()
    {
        Matrix4x4 m = Matrix4x4.TRS(Vector3.zero, Quaternion.Euler(0f, 0f, Time.time * 10f), Vector3.one);
        Material2SetMatrix.SetMatrix("_Matrix0", m);
    }
}

Spin a texture in just any material -is it possible?

1 Reply

example shader that supports texture matrix deformations

example script that deformates texture using matrix

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