Re: intersection traversal and pfPaths

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Mario Veraart (rioj7++at++fel.tno.nl)
Sat, 18 Apr 1998 15:31:27 +0200 (MET DST)

>
> Hi Folks!
>
> What I need from my intersection traversal is not only the node where the
> intersection occurred, but also the intersection path. Nothing more easy
> than that, I thought, took a look into the manual, and then used
> pfQueryHit(hits[0][0], PFQHIT_PATH, &path);
> But I only got an empty path, although the intersection occured and the
> node is deeply buried in the scene graph (and I start intersecting at the
> scene root).
> Here's what I do (the code prints <some> debug info ;-):
>
> pfHit** hits[1];
> pfSegSet iSegs;
> iSegs.mode = PFTRAV_IS_GSET;

You must tell the isect function to store the path info
Look in the man page of pfNode.
         iSegs.mode = PFTRAV_IS_GSET | PFTRAV_IS_PATH;

> pfCopyVec3(iSegs.segs[0].pos, handPosition->pos);
> pfCopyVec3(iSegs.segs[0].dir, handPosition->dir);
> iSegs.segs[0].length = handPosition->length;
> iSegs.userData = NULL;
> iSegs.activeMask = 0x01;
> iSegs.isectMask = VRCONTROLABLE_ISECT_MASK;
> iSegs.bound = NULL;
> iSegs.discFunc = NULL;
>
> if (pfNodeIsectSegs(root, &iSegs, hits) != 0)
> {
> pfPath* path;
>
> pfQueryHit(hits[0][0], PFQHIT_PATH, &path);
>
> // this returns zero; and therefore the path seems to be
> //empty...
> int pathLength = pfGetNum(path);
>
>
> pfNode* hitNode;
>
> // returns a valid hitNode
> pfQueryHit(hits[0][0], PFQHIT_NODE, &hitNode);
> }
>
>
> Maybe someone has some hints for me ;-). Thanx in advance,
>
> Uwe Pachler
>
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