* Physics - implement better approximation --- 4th order runge kutta would be a nice start, but there's a lot of stuff to do under this rubric, such as varying the step size depending on the conditions. - add in solar system snapshot. - Better bouncing: + repulsion field that drops off more quickly (nearly to zero outside of radius bound?) so as not to affect normal physics. - Redo COM-follow mode so it computes an offset for the COM, and then uses those to reposition before display. By keeping a record of the COM offsets, tracing could be made to do something reasonable in COM-follow mode. - Make 3D? Could be done with a 2D-display and a simple projection.... Use 2d-mouse movement for changing angle, maybe a scrollbar for depth. Could be done... - Make 3D for real: using LablGL. This will hurt portability and performance, however * Display - Consider breaking up traces into lots of little line segments. Whether this is an improvement depends on the internals of Tcl/Tk, but it does avoid the need for a linear scan (both in OCaml and in Tcl/Tk) every time a planet moves. - Consider using built-in Tcl/Tk scaling when zooming in and out. It's not clear, though, if that would really help performance. - Port to LablGtk? Canvas performance should be higher, there is anti-aliasing, and gtk can be linked in to make a small windows executable. This would be a lot of work, unfortunately. Also, what about portability? Should wait until LablGtk�is more clearly the standard for OCaml, or at least until it's better supported. - Allow for display of planet names next to planets * UI - improved GUI controls for optionbox + exponential control + Little up-and-down arrows on the entry controls would be nice. * Config Files - Allow files to refrain from setting some variables, like G and G-exp. This should be controllable from the UI. Perhaps add a keyword to indicate that the current values should not be overwritten. - Modify lexer to enable forward and backward compatibility. i.e., non-understood entries are simply dropped.