public static RendererMaterialSwap Swap(Renderer renderer, Material material, float dur)
{
if (renderer == null)
{
throw new System.ArgumentNullException("renderer");
}
if (material == null)
{
throw new System.ArgumentNullException("material");
}
var swap = renderer.AddOrGetComponent <RendererMaterialSwap>();
swap._renderer = renderer;
swap.StartSwap(material, dur);
return(swap);
}