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I am new to metal, and am trying to move a material normal texture by an offset while also taking advantage of metal's geometry modifier. When I was using a PhysicallyBasedMaterial I was using this function in the session function in the ViewController: waterMaterial.textureCoordinateTransform.offset.x += 0.0001 The normal is a png. This would move the texture every frame. Now that I'm using a CustomMaterial to take advantage of a geometryModifier this is no longer working. I can see the texture and am using the shader successfully but the texture itself is not moving. I assume I need to do this in my metal shader file. Possibly starting in this direction: [[visible]] void moveTexture(realitykit::geometry_parameters params) {     auto normal = params.textures().normal(); } Any help replicating the above functionality in metal would be much appreciated.