private void Init(InkCanvas canvas)
{
material = GetComponent <MeshRenderer>().sharedMaterial;
defaultMainTexture = canvas.GetMainTexture(material.name);
paintMainTexture = canvas.GetPaintMainTexture(material.name);
defaultNormalMap = canvas.GetNormalTexture(material.name);
paintNormalMap = canvas.GetPaintNormalTexture(material.name);
defaultHeightMap = canvas.GetHeightTexture(material.name);
paintHeightMap = canvas.GetPaintHeightTexture(material.name);
StartCoroutine(TextureLerp());
}