A shader that rotate the texture on an object

Questions & Answers
1

I was trying to rotate the texture by setting the matrix, the shader that I used was the diffuse shader with a pass that sets the matrix.

I’m not familiar with shader at all so the I just edited as less as I could

Shader "Diffuse" {
Properties {
	_Color ("Main Color", Color) = (1,1,1,1)
	_MainTex ("Base (RGB)", 2D) = "white" {}
}
SubShader {
	Tags { "RenderType"="Opaque" }
	LOD 200

CGPROGRAM
#pragma surface surf Lambert

sampler2D _MainTex;
fixed4 _Color;

struct Input {
	float2 uv_MainTex;
};

void surf (Input IN, inout SurfaceOutput o) {
	fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
	o.Albedo = c.rgb;
	o.Alpha = c.a;
}
ENDCG
}
Pass{
	SetTexture[_MainTex]
	{
		Matrix[_Matrix]
	}
}


Fallback "VertexLit"
}

and I used the below code for rotation

	AccumulatedTime += Time.deltaTime * Speed;
	Matrix4x4 matrix =  Matrix4x4.TRS(Vector2.zero, Quaternion.Euler(0, 0,AccumulatedTime), tiling);
	renderer.material.SetTextureOffset("_MainTex", Offset);
	renderer.material.SetMatrix("_Matrix1", matrix);

But the problem is that first: the shader then kills all lighting.
Second problem is it only rotates the texture based on a corner probably (0,0), I wanted to rotate the texture from the center, so I thought maybe changing the UV would work…

Any ideas? Sorry for being such a noob about shaders.

2

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