pfSegsIsectNode Problem....

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Andrew Barras (barras++at++vsl.ist.ucf.edu)
Mon, 3 Jul 1995 23:50:48 -0400 (EDT)

I have had a great deal of problems with this function. I took this code
from the intersect.c sample code and have had interesting results. After
about 10-15 times thru the loop the program crashes at the line with
pfSegstIsectNode. I used the WorkShop Debugger to find this out. The
program crashed with a bus error. I also got a core with the following
dbx output.

dbx version 3.19 Nov 3 1994 19:59:46 Core file process name doesn't match
executable Core from signal SIGSEGV: Segmentation violation (dbx) where > 0
pfCylIsectSphere(0x7fff8954, 0x0, 0x89749c, 0x909d10)
["../../../lib/libpr/geomath.c":3117, 0x5244cc]
   1 <stripped>() [<stripped>, 0x10085be8]

The following is the code fragment that I am having problems with.

Variable Declaration:

        pfSegSet segset;
         pfHit **hits[100];
          long isect;
        pfVec3 position; (my position)
        pfGroup *perf->Terrain->ModelRoot;
        proxObj[i].distance_from_me (float that tells me what the distance
                is from me to another object in my simulation)

Update Loop: (run once a frame)

            pfSetVec3(segset.segs[0].pos, position.xyz[0], position.xyz[1],
                (position.xyz[2]+1.0));
            segset.segs[0].length = proxObj[i].distance_from_me;
         isect = pfSegsIsectNode(perf->Terrain->ModelRoot, &segset, hits);
         
This is set only once at start of simulation:

        segset.activeMask = 1;
        segset.isectMask = 0xFFFF;
        segset.mode = PFTRAV_IS_PRIM|PFTRAV_IS_NORM|PFTRAV_IS_CULL_BACK;
        pfSetVec3(segset.segs[0].dir, 0.0f, 0.0f, -1.0f);
        segset.segs[0].length = 50000.0f;

Also, what are the defaults to the pfSegSet Structure? What needs to be
set to start with and what can be updated in simloop (pos, dir, ?????)

THANKS
______________________________________________________________________________
 Andrew Barras - chief modelurgist
                                         
                                 The University of Central Florida
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