"vec off", "vec on", or "vec arrow".  With "arrow",
draws an arrowhead on each vector, with 3-D size equal to
the vector's length times the 'arrowscale'.  The arrowhead always
lies in the screen plane, so its size gives a cue to the vector's
true 3-D length (e.g. when the vector is viewed nearly end-on,
even a small arrowhead can look longer than the vector does).
This also means that arrowheads flip orientation when a vector
passes through being seen nearly end-on.

Arrowhead size is set by a new second parameter to "vecscale".
Default is 0.25, meaning that arrowheads are a quarter the main vector's length.

Not in use yet.

Add "vec/vectors" and "vecscale" control commands and "vecvar" data command.
When enabled, draws a vector at each point, as specified by some
triple of attributes given by "vecvar".  Length is [vecvar .. vecvar+2]
scaled by vecscale (default 1).

Explicitly (int) when we've parsed into a float.

Interpret threshholding correctly for "hist".
Make "thresh off" finally work again, too.  Good grief.

Work in a way compatible with locking.

bug, so remove the Apple-specific workaround.

which seems to have bugs on some implementations (?!).
Let's see if this helps.

Add env var PARTIOLDOPENGL to force using non-glDrawElements path.

if some were fixed-oriented and others screen-facing.
Portability tweak from Toshi -- be even more pessimistic about stack size.

it seems to get the data completely wrong (most X's = 0, etc.).
If someone ever figures out why, I'd be curious to know.

Need config.h early.
Initialize "oldopengl".
More digits for "where".

Allow dyndata processors to switch themselves off with st->dyn.enabled = -1.

Use HAVE_SQRTF.

in each of the files that uses alloca.

CONSTify getfloats().

(chultquist@smuts.uct.ac.za, student of Anthony Fairall), as part of his
Computer Science Honours project.  Works with Chromatek glasses,
which make red things look nearby, blue things far away.
New commands:
   chromadepth {on|off}
	replaces colors of points and polygons with depth-coded colors
   chromaparams ZSTART ZRANGE
	sets Z-range (distance from camera plane) over which
	colormapping applies.  Z=ZSTART maps to first entry,
	Z=ZSTART+ZRANGE maps to last entry in colormap.
   chromacmap  FILE.CMAP
	Specifies colormap.
See example files data/chromadepth.cmap and data/hipchroma.

   "all"  - revert to autoranging
   "abs [base]"  - lum = scalefactor * abs(value - base)
   "lin"  - default behavior (unsets any "abs")

binary particle format!

small additions/changes to make os x and windows buildable and functional. open issues on windows time motion widgets and terminating cleanly.

MacOS X port, "home" command/button, lots of bug fixes -- into main branch!

Try to add pthread-based USE_IEEEIO.  Don't know if this works yet,
but it compiles.

the validity test.

mode.  Rather than having text be oriented per-graphics-window,
we choose the orientation of the master pipe.

and/or vertex normals.