/// <summary>Always draws even if properties haven't changed. Typically responds with a RenderTexture
/// but it depends on your tree (i.e. if your tree is just a constant, then you'll actually get a Texture2D back).</summary>
public Texture ForceDraw(DrawInfo settings)
{
// Draw the root now (which may also trigger the allocate):
Root_.DrawGPU(settings, this);
// Pull the resulting texture from root and return it:
return(Root_.DrawStore.Texture);
}