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functions in pl3d.i  s
set3_object

set3_object, drawing_function, _lst(arg1,arg2,...)
set up to trigger a call to draw3, adding a call to the
3D display list of the form:
DRAWING_FUNCTION, _lst(ARG1, ARG2, ...)
When draw3 calls DRAWING_FUNCTION, the external variable _draw3
will be nonzero, so DRAWING_FUNCTION can be written like this:
func drawing_function(arg1,arg2,...)
{
require, "pl3d.i";
if (_draw3) {
list= arg1;
arg1= _nxt(list);
arg2= _nxt(list);
...
......
......
return;
}
......
......
set3_object, drawing_function, _lst(arg1,arg2,...);
}
interpreted function, defined at i/pl3d.i line 630

SEE ALSO:

get3_xy,
get3_light,
sort3d

setz3

setz3, zc
Set the camera position to z=ZC (x=y=0) in the viewer's coordinate
system. If ZC is nil, set the camera to infinity (default).
interpreted function, defined at i/pl3d.i line 113

SEE ALSO:

rot3,
orient3,
undo3,
save3,
restore3,
light3

sort3d

sort3d(z, npolys, &list, &vlist)
given Z and NPOLYS, with numberof(Z)==sum(npolys), return
LIST and VLIST such that Z(VLIST) and NPOLYS(LIST) are
sorted from smallest average Z to largest average Z, where
the averages are taken over the clusters of length NPOLYS.
Within each cluster (polygon), the cyclic order of Z(VLIST)
remains unchanged, but the absolute order may change.
This sorting order produces correct or nearly correct order
for a plfp command to make a plot involving hidden or partially
hidden surfaces in three dimensions. It works best when the
polys form a set of disjoint closed, convex surfaces, and when
the surface normal changes only very little between neighboring
polys. (If the latter condition holds, then even if sort3d
misorders two neighboring polys, their colors will be very
nearly the same, and the mistake won't be noticeable.) A truly
correct 3D sorting routine is impossible, since there may be no
rendering order which produces correct surface hiding (some polys
may need to be split into pieces in order to do that). There
are more nearly correct algorithms than this, but they are much
slower.
interpreted function, defined at i/pl3d.i line 880

SEE ALSO:

get3_xy

spin3

spin3
or spin3, nframes
or spin3, nframes, axis
Spin the current 3D display list about AXIS over NFRAMES. Keywords
tlimit= the total time allowed for the movie in seconds (default 60),
dtmin= the minimum allowed interframe time in seconds (default 0.0),
bracket_time= (as for movie function in movie.i)
The default AXIS is [1,1,0] and the default NFRAMES is 30.
interpreted function, defined at i/pl3d.i line 945

SEE ALSO:

rot3

