More questions on intersections

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tidrowd++at++cc.tacom.army.mil
Wed, 3 May 1995 18:16:16 -0400

        Since this week's topic seems to be intersections, here's my question -
         
        pfQueryHit is segfaulting in the following discriminator callback:
         
        long projDiscFunc( pfHit* hit )
        {
            static pfGeoSet* gset;
            ...
         
            pfQueryHit( hit, PFQHIT_GSET, gset );
            ...
        }
         
         
        The thing I don't understand is why pfMQueryHit works (and apparently
        not pfQueryHit). The following code works fine:
         
        long HitQuery[]
        {
            PFQHIT_FLAGS,
            PFQHIT_GSET,
            PFQHIT_NODE
        };
         
        struct HitData
        {
            long flags;
            pfGeoSet* gset;
            pfNode* node;
        };
         
        long projDiscFunc( pfHit* hit )
        {
            static HitData hit_data;
            ...
         
            pfMQueryHit( hit, HitQuery, &hit_data );
            ...
        }
         
         
         
        Is there something obvious I'm missing, or is this a known bug???
         
        In addition, how do you determine how many intersections occurred
        along a single segment (assuming that the disc. callback turns off
        segment clipping)?
         
        Any enlightenment would be greatly appreciated!
         
         
        Don Tidrow
        Visual Simulation Developer
        US Army Tank-automotive and Armaments Command
         
        (imagine pithy saying here)

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