Hello,
After spending several years writing plain OpenGL, I decided to seek it a bit
higher, ending up with OSG. So I am currently working on my first project with
OSG and I like. However, I have two questions that, after searching this forum
and the web site, are not resolved yet.
1. My current project is developing a cloth simulation and it is working. The
model consists of particles connected with springs. To visualize everything I
use a Geometry object representing a triangle mesh, which I update every time
step by first calling the dirtyDisplayList() function. This is not a very clean
solution, but OSG is rather big and not everything has been documented, so
perhaps one of you know where I should be looking for a cleaner solution. There
is osgParticle and osgAnimation, though I get the impression that osgParticle
has been designed for unconnected particles.
2. I want to select particles with the mouse using a pick operation and this is
working now for all objects in the scene. I only need to pick the cloth's
particles, but how do I let OSG only do intersection tests on the cloth's
geometry? Current implementation is now:
Code:
ref_ptr<LineSegmentIntersector> intersector = new
LineSegmentIntersector(Intersector::PROJECTION, x, y);
IntersectionVisitor intersectionVisitor(intersector);
viewer->getCamera()->accept(intersectionVisitor);
//Get the intersected triangle
if (intersector->containsIntersections()) {
LineSegmentIntersector::Intersection intersection =
intersector->getFirstIntersection();
const LineSegmentIntersector::Intersection::IndexList& indexList =
intersection.indexList;
unsigned int triangle[3];
for (unsigned int j = 0; j < 3; ++j)
triangle[j] = indexList[j];
//Add picked particle to selection
clothSelector->selectNearestParticle(triangle,
intersection.getWorldIntersectPoint());
}
I hope you guys can help me out with these two issues.[/code]
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=19613#19613
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