pdf now supports 3d models

The following pdf file contains a couple of 3d snaps of helios vehicle simulation.
Can be viewed in adobe acrobat reader versions above v7.

http://homepages.strath.ac.uk/~lhs03125/pdf_3d_sample.pdf

Colors on the superposed mesh

(Touched Helios code after a long time.)
I have been using the same drawing code for the meshes to be colored on the fly and the meshes to be pre-colored. So I kept the display list for the entire 3ds meshes free from glColor??? calls.
Diversified it now so that the background mesh and other preloaded meshes can have their predefined colors.