Can a rvt render an object in reverse order?

If I render a sphere’s height into an rvt, the top of the sphere is what will appear in the rvt’s heightmap.
Is there a way I can invert the render order, so the the sphere writes it’s bottom/underside into the rvt.

I have tried rotating the rvt volume 180 degress, and giving it negative scale, but this didnt help.

Any ideas how this can be achieved?