# TODO write an operator- for vec3
# TODO use x[0] x[1] x[2] instead of x y z ?
#   it would be good to have transparent unions / aliases within a struct
#   can I get brace to do this?  8)

# TODO rename these headers to:
#   b/graphics.h
#   b/math.h
#   (and add b/time.h)
#   Add a "b.h" (or just "b"?) that includes all the normal headers, for simplicity?

# TODO give brace a nicer syntax for const and not-const reference args
# (and const / non-const reference return types too I guess)

# TODO get brace to predeclare all functions (and structs and classes) using brace_header or similar, not hard.
#   1. declare all structs (no def though)
#   2. declare all functions
#   3. define all structs
#   4. declare all variables ?
#   5. define all functions

# TODO why is my STL code so ugly?
# TODO reimplement poly_angle3_to_poly_vec3 as a generic `map' function
# but can't call it map due to STL calling their dicts `map'.  :(
# maybe call it vector_map or something

work out how to profile C / C++ code
  - record number of function calls per function
  - time how long each function takes in a separate program ???
  - look for existing profiling programs



center-on-land function (again)

keyboard / mouse navigation


use bzip2 to compress the data for transfer over internet ?