viewer using only the shader.

slice, and averages the results. This gives us almost free antialiasing,
since all these queries will need to be done anyway for raytracing.

gains 10 milliseconds in the game tick.

whether to use the system mouse pointer or not.

sending the part we just modified.

each frame.

to avoid common programming errors.

reuse the linear operations in quaternions. Also mark some constructors
explicit to better spot coding errors.

function use degrees rather than radians.

cross product, normalize, etc.

at (0,0).

to modify their precision at runtime.

mode, and do not call "new" when we’re not sure "delete" can be called.

build host.