Hi,
I recently upgraded to the OSG v3.6.1 and I noticed that the new
LineSegmentIntersector has changed significantly compared to v3.4.0. As I was
reviewing the changes, I noticed that the LineSegmentIntersector now allocates
an instance of LineSegmentIntersectorUtils::Settings every time the
IntersectionVisitor intercepts a drawable.
>From a purely efficiency standpoint, I was wondering if we could do better.
>Intersection were relatively slow in the past and now it seems that we made
>even slower. That being said, I'm pretty sure there's a valid reason for why
>it was done this way. Before I look at alternative solutions, I was wondering
>if anyone could share for reasons.
Below is a snip-it of the function:
void LineSegmentIntersector::intersect(osgUtil::IntersectionVisitor& iv,
osg::Drawable* drawable,
const osg::Vec3d& s, const osg::Vec3d& e)
{
if (reachedLimit()) return;
osg::ref_ptr<LineSegmentIntersectorUtils::Settings> settings = new
LineSegmentIntersectorUtils::Settings; ////// <<<<<<<<<< HERE <<<<<<<<<<<<
settings->_lineSegIntersector = this;
settings->_iv = &iv;
settings->_drawable = drawable;
settings->_limitOneIntersection = (_intersectionLimit ==
LIMIT_ONE_PER_DRAWABLE || _intersectionLimit == LIMIT_ONE);
osg::Geometry* geometry = drawable->asGeometry();
if (geometry)
{
settings->_vertices =
dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
}
osg::KdTree* kdTree = iv.getUseKdTreeWhenAvailable() ?
dynamic_cast<osg::KdTree*>(drawable->getShape()) : 0;
if (getPrecisionHint()==USE_DOUBLE_CALCULATIONS)
{
osg::TemplatePrimitiveFunctor<LineSegmentIntersectorUtils::IntersectFunctor<osg::Vec3d,
double> > intersector;
intersector.set(s,e, settings.get());
if (kdTree) kdTree->intersect(intersector, kdTree->getNode(0));
else drawable->accept(intersector);
}
else
{
osg::TemplatePrimitiveFunctor<LineSegmentIntersectorUtils::IntersectFunctor<osg::Vec3f,
float> > intersector;
intersector.set(s,e, settings.get());
if (kdTree) kdTree->intersect(intersector, kdTree->getNode(0));
else drawable->accept(intersector);
}
}
Regards,
Guy Volckaert, ing.
Snr Software Engineer
Meggitt Training Systems (Quebec) Inc.
Systèmes d'entraînement Meggitt (Québec) Inc.
6140 Henri Bourassa West
Montreal, Quebec, H4R 3A6
Canada
Tel: 1 (514) 339 9938 Ext 617
Fax: 1 (514) 339 2641
Cell: 1 (514) 928-5641
email: guy.volcka...@meggitt.com
url; www.meggitt.com
skype: guy.volckaert
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