Re: Gnuplot crashing for "hidden3d undefined" ?

[Ethan A M. <merritt@u.washington.edu>]

On Saturday 27 October 2007 13:07, Hans-Bernhard Br=F6ker wrote:
>=20
> The problem itself is an internal constraint violation in the hidden3d=20
> algorithm.  Something broke the code designed to ensure that=20
> out-of-range data points don't make it to that point of the algorithm.

I first tried ./configure  --disable-h3d-quadtree
The problem was still there.

Reverting hidden3d.c to cvs version 1.54 -> problem is still there
Reverting hidden3d.c to cvs version 1.53  ->  problem is no longer evident

The ChangeLog entry for 1.54 is

2005-12-06  Hans-Bernhard Broeker  <br...@ph...>

        * src/hidden3d.c (COORD_TO_TREECELL, COORD_TO_BITMASK): Avoid
        overflow by undoing effect of surface_scale before mapping to
        integers.
        (store_polygon): Add assert()s to internal macros GET_MIN,
        GET_MAX, to catch problems not handled by above changes.
        (in_front): Avoid accessing qlist[-1].  Make sure
        p_list[] is always filled, even if doing a single-vertex pseudo
        edge.


So it's your change.  Do you want to have a look at it?

BUT....
=3D=3D=3D=3D=3D=3D=3D> THIS IS ONLY TRUE FOR  --disable-h3d-quadtree=20

If I leave the quadtree code enabled, I get this failure even after reverti=
ng to 1.53 =20
=46urthermore, if I go back and rebuild from the 4.0 source with --enable-h=
3d-quadtree
then it fails.

So I there are two separate issues here:
 =20
1) We changed the default 4.2 configuration to --enable-h3d-quadtree

2) The non-quadtree version was subsequently broken by the patch from 1.53 =
=2D> 1.54



=2D-=20
Ethan A Merritt