Re: [osg-users] IntersectVisitor question
Wow, so this is odd. I found a way to fix this.
I was using a linesegment length of 2.0, as I had a 2 ft stick attached
to the wand. But, if I make the linesegment longer, to a length of
200.0, the intersection works like a charm.
Is this the intended behavior?
Dave Pugmire wrote:
Hi,
I'm scratching my head on this one.
I have a line segment, that is aligned to the tracked wand. I'm trying
to intersect it with the scene, which is composed of a single box.
However, the intersections that I get are not making sense.
Here is the line segment, made from two points:
p1 = ( -.24, 5.5, .033 ) p2 = (-.24 5.5 -1.96)
Note that this is a line of constant Y=5.5
Length of 2 along the -Z direction.
The box is cenetered at 0, 4.5, -1, and has unit dimensions.
The bounding box of the box is:
xyzMin = [-.5, 4, -1.5] xyzMax = [.5, 5, -.5]
The box has no transformations above it, it's a direct child of the
scene root.
When I run IntersectVisitor on the graph, it detects an intersection
with the box at: [-.17, 4.0, -.88]
Which is NOT on the LineSegment.
I'm confused. Here is the code that I'm using.
m_wandP1 and m_wandP2 are the two points mentioned above.
Thanks,
-dave
void CWand::UpdateIntersect( osg::Group *pSceneRoot )
{
osg::Vec3 wandDir = m_wandP2 - m_wandP1;
//Create a line segment for the wand end points.
osg::ref_ptrosg::LineSegment wandStick = new osg::LineSegment(
m_wandP2, -wandDir );
//Intersect with the scene graph.
osgUtil::IntersectVisitor intersectVisitor;
intersectVisitor.setLODSelectionMode(
osgUtil::IntersectVisitor::USE_HIGHEST_LEVEL_OF_DETAIL );
intersectVisitor.addLineSegment( wandStick.get() );
pSceneRoot-accept( intersectVisitor );
if ( m_bPrintUpdate )
printf( Poke: P0 %f %f %f P1 %f %f %f Dir:[%f %f %f]\n\n,
m_wandP1[0],m_wandP1[1],m_wandP1[2],
m_wandP2[0],m_wandP2[1],m_wandP2[2],
wandDir[0],wandDir[1],wandDir[2] );
osgUtil:: IntersectVisitor::HitList htl =
intersectVisitor.getHitList( wandStick.get() );
vectorosg::Geode* geodeHits;
int numHits = 0;
if ( htl.size() 0 ) // We always hit the wand, so only consider
additional hits.
{
for ( int i = 0; i htl.size(); i++ )
{
osg::Vec3 pt = htl[i].getWorldIntersectPoint();
osg::Vec3 n = htl[i].getWorldIntersectNormal();
osg::NodePath np = htl[i].getNodePath();
//osg::Vec3 pt = htl[i].getLocalIntersectPoint();
osg::Vec3 dir = m_wandP1-pt;
if ( true )
{
numHits++;
geodeHits.push_back( htl[i].getGeode() );
if ( m_bPrintUpdate )
{
printf( \tIsect[%d]: %s D=%f [%f %f %f] Pt=%f %f %f N%f
%f
%f\n, numHits,
htl[i].getGeode()-getName().c_str(),
dir.length(),
dir[0],dir[1],dir[2],pt[0],pt[1],pt[2],
n[0],n[1],n[2] );
osg::BoundingBox bb = htl[i].getGeode()-getBoundingBox();
printf( \tBBOX: [%f %f %f] [%f %f %f]\n,
bb.xMin(),bb.yMin(),bb.zMin(),
bb.xMax(),bb.yMax(),bb.zMax() );
printf( \t Node path:\n );
for ( int j = 0; j np.size(); j++ )
{
osg::Node *node = np[j];
printf( \t%d: %s\n, j, node-className() );
osg::MatrixTransform *pMT =
dynamic_castosg::MatrixTransform*(node);
osg::PositionAttitudeTransform *pPAT =
dynamic_castosg::PositionAttitudeTransform*(node);
if ( pMT != NULL ) //node-className() ==
MatrixTransform )
{
osg::MatrixTransform *pMtx = (osg::MatrixTransform
*) node;
osg::Matrix mtx = pMtx-getMatrix();
printf( \t T[%f %f %f] [%f %f %f] [%f %f %f] [%f
%f %f]\n,
mtx(3,0),mtx(3,1),mtx(3,2),
mtx(0,0),mtx(0,1),mtx(0,2),
mtx(1,0),mtx(1,1),mtx(1,2),
mtx(2,0),mtx(2,1),mtx(2,2) );
}
else if ( pPAT != NULL )
{
osg::Vec3 p = pPAT-getPosition();
osg::Quat Q = pPAT-getAttitude();
osg::Vec4 q = Q.asVec4();
printf( \t T[ %f %f %f] Q[%f %f %f %f]\n,
p[0],p[1],p[2], q[0],q[1],q[2],q[3] );
}
else
printf( ??\n );
}
//osg::Matrix *mtx = (osg::Matrix*)htl[i].getMatrix();
//printf
[osg-users] Light sources
Hi, How many are allowed? I'm having trouble getting multiple lights. One seems to work fine, but not 2 or 3. Does something need to be enabled? Thanks, Dave ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Coordinate systems
What is the easiest way to change the coordinate system of OSG? I read in documentation that there is a way to do it, but it never says how. I need to have the world be XZ on the floor and +Y up. Is it best to attach a transform node below the root, and hang everything off that, or can I configure something? Thanks, Dave ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Moving things around
The wand is hand held device that is motion tracked, so as I move it around in the immersive cave, the caveLib determines it's XYZ position and orientation. What I want to do is to move an object in the scene graph around as if it were attached to the hand held device. Where the hand-held device goes, the node in the scene graph goes. By tweaking and hacking, I was able to make things move. Using an simple scene with a floor, and the cow, with this heirarchy: root -- group -- PositionAttitudeTransform -- MatrixTransform -- Geode(cow) If I grab the MatrixTransform node, and postMultiply it's matrix with a translation matrix, I can make the cow move. However, to get this to work in the general case, I need to obtain the localToWorld/worldToLocal mtx for the geode, and use it, with the position of the hand-held wand to create a new matrix for this geode that positions it on the wand. Does that make sense? -dave Adrian Egli wrote: Hi Dave, i don't right understand what you are looking for. But there exists many different techniques in the osg core, one it the osg::Animation may this node would be exactly you were looking for. /adegli 2007/8/15, Dave Pugmire [EMAIL PROTECTED] mailto:[EMAIL PROTECTED]: Hi, I'm writing a cavelib application, and I want to be able to drag things around in the CAVE with the wand. So, given a Geode, I want to have it follow the position and orientation of the wand. Not sure how to do this, or where in the examples or elsewhere to look for code that can help. Can someone point me in the right direction? Thanks, Dave ___ osg-users mailing list osg-users@lists.openscenegraph.org mailto:osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Adrian Egli ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] DISPLAY
Hi, I'm running an example remotely over ssh. I did ssh -X, and verified that DISPLAY is set. However, when I run, I get: 'unable to open display :0.0' Ideas? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] compiling examples
Thanks. That did it. Having an odd problem now. When I press esc to kill the app, it locks my computer. Is there some other setting I missed? As a work around I have OSG_WINDOW set so that it doesn't run in full screen mode so I can kill it from the xterm. Thanks, -dave Robert Osfield wrote: Hi Dave, The examples aren't build by default - there are nearly a hundred of them so its good to keep build time down for those who don't need them. The examples can be built by running: cd OpenSceneGraph ccmake . And then in console GUI presented toggling on the BUILD_OSG_EXAMPLES to ON, the press 'c' to configure, then 'g' to generate the final build system. Then just run make as sual. Robert. On 8/1/07, Dave Pugmire [EMAIL PROTECTED] wrote: Hi, Newbie here. Just installed the 2.0 on linux, did a make: ./configure make But it didn't make the examples. cd examples cmake . gave me a 'Unknown Cmake command SETUP_EXAMPLE' I'm not finding anything in particular about building the examples. Should it happen automatically when building the OSG source? Not seeing anything in the make files either Thanks for your help- -dave ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] compiling examples
It would give back keyboard, provided that I didn't run in full screen mode, and could ^C it at the xterm to kill it. In full screen, I had to give it the vulcan death grip to kill the X server. However, I just installed the latest NVIDIA driver, and all works now. Thanks all for your help. I hope that as I learn, I can contribute back. So far, OSG seems very nice. -dave Peter Gebauer wrote: Hello there! I have a similar problem where it seems that the OSG apps refuse to give back keyboard control to the window manager, could you be experiencing something simlar? Does mouse control still work after quiting? /Peter On 2007-08-02 (Thu) 09:51, Dave Pugmire wrote: Thanks. That did it. Having an odd problem now. When I press esc to kill the app, it locks my computer. Is there some other setting I missed? As a work around I have OSG_WINDOW set so that it doesn't run in full screen mode so I can kill it from the xterm. Thanks, -dave Robert Osfield wrote: Hi Dave, The examples aren't build by default - there are nearly a hundred of them so its good to keep build time down for those who don't need them. The examples can be built by running: cd OpenSceneGraph ccmake . And then in console GUI presented toggling on the BUILD_OSG_EXAMPLES to ON, the press 'c' to configure, then 'g' to generate the final build system. Then just run make as sual. Robert. On 8/1/07, Dave Pugmire [EMAIL PROTECTED] wrote: Hi, Newbie here. Just installed the 2.0 on linux, did a make: ./configure make But it didn't make the examples. cd examples cmake . gave me a 'Unknown Cmake command SETUP_EXAMPLE' I'm not finding anything in particular about building the examples. Should it happen automatically when building the OSG source? Not seeing anything in the make files either Thanks for your help- -dave ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
