pfModel crash

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From: Ken Lindsay (kl++at++stokes.arc.nasa.gov)
Date: 02/18/2000 17:22:13

hi,

i made a c++ class which includes a pfNode* for a model, nothing
particularly unusual s'far as i can tell. when i load the model
file and assign the top of it to the pfNode* in the class object,
performer crashes like this:

dbx version 7.2.1.3m Dec 23 1998 01:09:37
PC value from core file (0x3ef2d8f8) is not part of the program.
Assuming return register value (0x3ef2d8f8) usable to locate PC.
Core from signal SIGBUS: Bus error
(dbx) where
> 0 pfBuffer::pf_prepareNewUpdatables(int)(0x64036f60, 0x0, 0x77, 0x1, 0x640012c8, 0x20000, 0x3f6c760c, 0x8) ["/xlv61/performer/work/perf/lib/libpf/pfBuffer.C":750, 0x3ef2d8f8]
   1 ::pfSync(0x5fbe2a50, 0x64001370, 0x77, 0x1, 0x640012c8, 0x20000, 0x3f6c760c, 0x8) ["/xlv61/performer/work/perf/lib/libpf/pfProcess.C":3480, 0x3effbdb0]
   2 ::main(0x2, 0x7fff2f04, 0x0, 0x0, 0x0, 0x20000, 0x3f6c760c, 0x8) ["/hosts/shannon/u/people/kl/sim/gfx/code/SimpleLoader/simpleLoader.cpp":165, 0x100052c0]
   3 __start() ["/xlv55/kudzu-apr12/work/irix/lib/libc/libc_n32_M3/csu/crt1text.s":177, 0x100049c8]

here's the sketch of the class:

class NelAircraft
{
public:
                                                 NelAircraft(char *name);
        virtual ~NelAircraft(void);
        virtual pfNode * getModel(); // top of the model hierarchy

....

private:
        pfNode *aircraftModel; // location and heading matrix.

....
}

when i change the load line to the vanilla form:

   pfNode *root = pfdLoadFile(argv[1]);
    // Attach loaded file to a new pfScene
    pfScene *scene = new pfScene;
    scene->addChild(root);

it loads and runs fine. when i do it thru the class object:

  aircraft = new NelAircraft(argv[1]);
  pfNode *root = aircraft->getModel();
   // Attach loaded file to a new pfScene
    pfScene *scene = new pfScene;
    scene->addChild(root);

then performer crashes with the above mentioned
pfBuffer::pf_prepareNewUpdatables unhappiness.

am i missing something basic and obvious here or
is it likely some other part of the code? when
i do a gdiff on the pfPrint(....) generated files
of the two versions of loading, the only differences
i see are in the addresses of the pfObjects. all
the structure seems identical. eg:

2337c2336
< } GeoSet: 0x64092280 

---
>             } GeoSet: 0x64092090
2339,2342c2338,2341
<       [3:1]} pfGeode 212 0x64092bd0
<     [2:0]} pfGroup 208 0x64090050
<   [1:3]} pfDCS 207 0x6408fdb0
< [0:0]} pfGroup 133 0x640428b0
---
>       [3:1]} pfGeode 210 0x640929e0
>     [2:0]} pfGroup 206 0x6408fe60
>   [1:3]} pfDCS 205 0x6408fbc0
> [0:0]} pfGroup 131 0x64042820

any help would be appreciated.

ken

and the getModel function is:

pfNode *NelAircraft::getModel()	// get the top of model hierarchy
{
	return aircraftModel;
}

-==-

ken "fire a few neurons" lindsay        kl++at++mars.arc.nasa.gov
NASA Ames Research Center               Caelum Research Corp
Bldg 269, Room 281                      (650) 604 0461 (lab)
Mail Stop 269-1                         (650) 604 3594 (fax)
Moffett Field, CA 94035-1000            (650) 604 3181 (vox)

     When inlaws are outlawed, only outlaws will have inlaws

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