FGFS-4.1/OpenSceneGraph
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Added View::computeIntersection implementation for a node withing a scene graph.

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This commit is contained in:
Robert Osfield
2007-01-10 10:09:05 +00:00
parent 4d4b342e97
commit 4954262eb0
8 changed files with 69 additions and 106 deletions
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36
src/osgViewer/View.cpp
View File

@@ -409,11 +409,43 @@ bool View::computeIntersections(float x,float y, osgUtil::LineSegmentIntersector
}
}
bool View::computeIntersections(float x,float y, osg::Node* node, osgUtil::LineSegmentIntersector::Intersections& intersections,osg::Node::NodeMask traversalMask)
bool View::computeIntersections(float x,float y, osg::NodePath& nodePath, osgUtil::LineSegmentIntersector::Intersections& intersections,osg::Node::NodeMask traversalMask)
{
if (!_camera.valid()) return false;
osg::notify(osg::NOTICE)<<"View::computeIntersections(x,y,node,intersections) not implemented"<<std::endl;
return false;
osg::Matrix matrix = osg::computeWorldToLocal(nodePath) * _camera->getViewMatrix() * _camera->getProjectionMatrix();
double zNear = -1.0;
double zFar = 1.0;
if (_camera->getViewport())
{
matrix.postMult(_camera->getViewport()->computeWindowMatrix());
zNear = 0.0;
zFar = 1.0;
}
osg::Matrix inverse;
inverse.invert(matrix);
osg::Vec3d startVertex = osg::Vec3d(x,y,zNear) * inverse;
osg::Vec3d endVertex = osg::Vec3d(x,y,zFar) * inverse;
osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::MODEL, startVertex, endVertex);
osgUtil::IntersectionVisitor iv(picker);
iv.setTraversalMask(traversalMask);
nodePath.back()->accept(iv);
if (picker->containsIntersections())
{
intersections = picker->getIntersections();
return true;
}
else
{
intersections.clear();
return false;
}
}