PandaSteer 2

I’ve downloaded your steer code. Just want to say great work. I have a couple of questions/suggestions.

-The obstacle class currently only allows spheres. it seems like boxes or rectangles would be more useful for many applications.

-There are many applications for the current 2D steer class. Have you thought about making a separate 3D steer class with the same behaviors?

keep up the good work.