Problem for you, /prog/

If you have convex polyhedron represented by a bunch of planes in hessian normal form, how do you calculate its outline along the the z-plane (in z-up), i.e. how its shadow would look on the ground if the sun were directly above it.

>>3
As a result of catastrophic natural disasters it was destroyed in the film http://en.wikipedia.org/wiki/2012_movie

Convex hulls are for building ships.
Projections are for math.
>>1 http://en.wikipedia.org/wiki/Projection_%28linear_algebra%29#Projections_on_normed_vector_spaces may apply, did you read it?