Fos actors

• There is no other internal drawing structure apart from that given by opengl itself.
• Input Datastructures are numpy arrays or sequences of numpy arrays.
• The numpy arrays are directly linked to DrawElements by their .data pointers
• Our main object is an Actor which has draw(), update(), init(), make_aabb(), pickray(), etc.
• If you want your object to be shown on the Fos window then you need to make a class e.g. MyActor witch inherits the Actor and then fill inside the opengl commands who suit your needs.
• Because python calls take a lot of time we always try to reduce the number of calls. Opengl gives us some commands to facilitate that which we recommend.