More testing cloud layers with final density and depth fed by camera projected images.
The storm cloud is a standard cumulus 3d layer at altitude 2087 , depth 1000.
The rainbow is a separate 3d layer at 1850 altitude, depth 100.
The lightning is a separate 3d layer at altitude 1605, depth 10.
So you may be thinking how can the lightning cloud at 1605 altitude appear to have parts striking the ground ?
The lightning bolts only appear to go down because of parallax.
The fine cloud tendrils that make them really just extend back toward the horizon.
To illustrate, I include an
image of the exact same cloud with the render camera moved to a position well above it.
This represents a time before Physics was invented which is why the rainbow can be
in a slightly impossible position for today's world
Models by Marc Gebhart, Walli, Xfrog, dino modeler unknown.