Beauty of Three Dimensions
Three Dimensional Polyhedra and Spatial Visualization
Return to Yes, 3D
The Draw in 3d app (by Steffan Poulsen) is really great.
There is a built-in Tutorial. The app is quite intuitive.
I have made a (PDF) slideshow (<<click) of screen shots of the tutorial for reference.
One early drawing is shown. Much, much more can be done.
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