Add a matrix material property.

Function variant that takes nameID is faster. If you are adding properties with the same name repeatedly, use Shader.PropertyToID to get unique identifier for the name, and pass the identifier to AddMatrix.

	var rotateSpeed = 30;
	var texture : Texture;
	var aMesh : Mesh;
	// Create a new material with a shader
	// that rotates the texture. Texture rotation
	// is performed with a _Rotation matrix.
	var m : Material = new Material (
		"Shader \"Rotating Texture\" {" +
			"Properties { _MainTex (\"Base\", 2D) = \"white\" {} }" +
			"SubShader {" +
			"    Pass {" +
			"        Material { Diffuse (1,1,1,0) Ambient (1,1,1,0) }" +
			"        Lighting On" +
			"        SetTexture [_MainTex] {" +
			"            matrix [_Rotation]" +
			"            combine texture * primary double, texture" +
			"        }" +
			"    }" +
			"}" +
		"}"
	);
	m.mainTexture = texture;

	function Update() {
		var materialProperty : MaterialPropertyBlock = new MaterialPropertyBlock();
		// Construct a rotation matrix and set it for the shader
		var rot : Quaternion = Quaternion.Euler (0, 0, Time.time * rotateSpeed);
		var mtrx : Matrix4x4 = Matrix4x4.TRS (Vector3.zero, rot, Vector3(1,1,1) );
		// Update the rotation matrix.
		materialProperty.AddMatrix ("_Rotation", mtrx);
		Graphics.DrawMesh(aMesh, Vector3(-5,0,0), Quaternion.identity,
				  m, 0, null, 0, materialProperty);
	}