Chris, Is it possible to add an SVG overlay option for planets, and have it scale and shift position with the camera? I mentioned this once before, long ago. Instead of having to create a 3d model of the plants with their own textures and models, why not use a single SVG image to represent the interior of a planet. I created a quick mock up that you might find interesting. This way no matter what direction the planet is in, what way you are facing it, it rotation, the overlay would always be towards the camera.
I am attaching a relatively advanced SVG file SVG 1.1 compliant, that supports some cool effects. Unfortunately Firefox as well and IE are not fully SVG compliant yet so you might need to use the FREE program
http://www.inkscape.org/ which is a SVG editor to see the effects. Right now the image is lacking the planet information because i am still missing information.
An onto planet information, Can someone help me with getting the correct information on the plants structure? I can been all over the web and I am getting some conflicting results on the composition of the Outer core. The Rest is I believe good See Attached
Planetcore5b.zip
BTW thank to Fenerit and Cham for inspiring me to do this.