From: Damien Gerhardy (damien.gerhardy++at++sydac.com.au)
Date: 04/21/2005 22:04:26
I've run in to a problem with some ray casting code on
Irix that works fine on Windows.
After pfNode->isect returns a hit I call ->query(PFQHIT_POINT, pnt.vec)
on the hit and get pnt.vec set to (nan, nan, nan).
Many other points *near* the point I am testing seem to work but the
same points seem to fail the raycast each time.
Here is the code I am using below. If anyone knows of a workaround, or
how to fix this it would be of great help.
*Just to reiterate, this code works fine on several projects on the Windows
platform but does not work on Irix (tested with performer 2.2 and 3.1.1).
int PerformerEngine::RayCast(const Vision::Ray &ray, Vision::RayHit
&rayhit)
{
// Make a performer line segment for testing
// Need a segment set to do the testing
::pfSegSet segset;
// set up intersection segment, pointing down
// for "terrain" following
segset.activeMask = 1;
segset.isectMask = 0x0000FFFF; // Set high masks on m_objects to
skip isector hit
segset.discFunc = NULL;
segset.bound = NULL;
segset.mode = PFTRAV_IS_PRIM;
segset.segs[0].pos.set(ray.x, ray.y, ray.z);
segset.segs[0].dir.set(ray.dx, ray.dy, ray.dz);
segset.segs[0].length = (ray.distance <= 0.0 ? 999.0 :
ray.distance);
// Cast from the scene node - we are testing against the whole
scene!
// Prepare a list for hits - but we only realy care about the first
one.
// All the examples on the web use [32] here. Not sure why.
::pfHit **hits[32];
int numhits;
numhits = g_scene->m_pnode->isect(&segset, hits);
if (numhits <= 0)
{
return 0;
}
// get the hit point
::pfVec3 pnt;
(*hits[0])->query(PFQHIT_POINT, pnt.vec);
#ifdef IRIX
// we need to sanity check the hit point on IRIX
if (isnan(pnt.vec[PF_Z]))
{
LOG_ERROR << "RayCast point is invalid" << ENDLOG; // THIS
ERROR COMES UP OFTEN!!
return 0;
}
#endif
// transform object point into scene coordinates
::pfMatrix xmat;
(*hits[0])->query(PFQHIT_XFORM, (float*)xmat.mat);
::pfVec3 xpnt;
xpnt.xformPt(pnt, xmat);
// copy into rayhits
rayhit.x = xpnt[PF_X];
rayhit.y = xpnt[PF_Y];
rayhit.z = xpnt[PF_Z];
return 1;
}
Thanks.
-Damien
Damien Gerhardy
SYDAC Pty Ltd
Simulating a Better Reality
113-115 King William Street
Adelaide, SA, 5000
Australia
tel: +61 8 8239 3600
fax: +61 8 8212 0334
damien.gerhardy++at++sydac.com.au
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