Surface Shader with Material Matrix

Question

Has anyone successfully passed a matrix to a surface shader. I've found several examples online passing matrices to shaders, but I can't get my matrix to have any value other than identity. The only difference I can see is that the examples I've seen are fragment shaders, and mine is a surface shader.

My script has

    var m = Matrix4x4.TRS(new Vector3(0, 10, 0), Quaternion.identity, Vector3.one);
    targetMaterial.SetMatrix("_BoneMatrix0", m);

and my shader has

  uniform float4x4 _BoneMatrix0;

Seems straightforward enough, so I'm wondering if this feature works at all with surface shaders

Answer 1

set matrix works fine. see code below that just tested. this code rotates texture using matrix.

in your code i saw you apply matrix with offset 10 only. you should not see the difference because offset texture for a natural number will not make any visual affect.

shader code:

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;

}

script code:

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);
    }
}

Surface Shader with Material Matrix

1 Reply

shader code:

script code:

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