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Added support for osgUtil::Intersectors being in WINDOW, PROJECTION, VIEW or MODEL coordinates

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This commit is contained in:
Robert Osfield 2006-11-01 14:41:32 +00:00
parent a253e17d3e
commit 75169ad16f
3 changed files with 170 additions and 20 deletions
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60
examples/osgkeyboardmouse/osgkeyboardmouse.cpp
View File

@ -13,6 +13,7 @@
#include <osgUtil/SceneView>
#include <osgUtil/IntersectVisitor>
#include <osgUtil/IntersectionVisitor>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
@ -187,7 +188,62 @@ public:
float mx = _sceneView->getViewport()->x() + (int)((float)_sceneView->getViewport()->width()*(ea.getXnormalized()*0.5f+0.5f));
float my = _sceneView->getViewport()->y() + (int)((float)_sceneView->getViewport()->height()*(ea.getYnormalized()*0.5f+0.5f));
#if 1
osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector(osg::Vec3d(mx,my,0.0), osg::Vec3d(mx,my,1.0) );
picker->setCoordinateFrame(osgUtil::Intersector::WINDOW);
osgUtil::IntersectionVisitor iv(picker);
_sceneView->getCamera()->accept(iv);
osg::notify(osg::NOTICE)<<"Done pick, "<<picker->containsIntersections()<<std::endl;
if (picker->containsIntersections())
{
osgUtil::LineSegmentIntersector::Intersection intersection = picker->getFirstIntersection();
osg::notify(osg::NOTICE)<<"Picking "<<intersection.localIntersectionPoint<<std::endl;
osg::NodePath& nodePath = intersection.nodePath;
osg::Node* node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
osg::Group* parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
// now we try to decorate the hit node by the osgFX::Scribe to show that its been "picked"
if (parent && node)
{
std::cout<<" parent "<<parent->className()<<std::endl;
osgFX::Scribe* parentAsScribe = dynamic_cast<osgFX::Scribe*>(parent);
if (!parentAsScribe)
{
// node not already picked, so highlight it with an osgFX::Scribe
osgFX::Scribe* scribe = new osgFX::Scribe();
scribe->addChild(node);
parent->replaceChild(node,scribe);
}
else
{
// node already picked so we want to remove scribe to unpick it.
osg::Node::ParentList parentList = parentAsScribe->getParents();
for(osg::Node::ParentList::iterator itr=parentList.begin();
itr!=parentList.end();
++itr)
{
(*itr)->replaceChild(parentAsScribe,node);
}
}
}
}
#else
// do the pick traversal.
osgUtil::PickVisitor pick(_sceneView->getViewport(),
_sceneView->getProjectionMatrix(),
@ -239,6 +295,8 @@ public:
}
}
#endif
}
void saveSelectedModel()

44
include/osgUtil/IntersectionVisitor
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@ -34,9 +34,23 @@ class Intersector : public osg::Referenced
{
public:
enum CoordinateFrame
{
WINDOW,
PROJECTION,
VIEW,
MODEL
};
Intersector():
_coordinateFrame(MODEL),
_disabledCount(0) {}
void setCoordinateFrame(CoordinateFrame cf) { _coordinateFrame = cf; }
CoordinateFrame getCoordinateFrame() const { return _coordinateFrame; }
virtual Intersector* clone(osgUtil::IntersectionVisitor& iv) = 0;
virtual bool enter(const osg::Node& node) = 0;
@ -57,6 +71,7 @@ class Intersector : public osg::Referenced
protected:
CoordinateFrame _coordinateFrame;
unsigned int _disabledCount;
};
@ -68,9 +83,13 @@ class OSGUTIL_EXPORT LineSegmentIntersector : public Intersector
public:
LineSegmentIntersector(const osg::Vec3d& start, const osg::Vec3d& end, LineSegmentIntersector* parent=0);
struct Intersection
{
Intersection():
ratio(-1.0),
primitiveIndex(0) {}
bool operator < (const Intersection& rhs) const { return ratio < rhs.ratio; }
typedef std::vector<unsigned int> IndexList;
@ -90,7 +109,8 @@ class OSGUTIL_EXPORT LineSegmentIntersector : public Intersector
inline void insertIntersection(const Intersection& intersection) { getIntersections().insert(intersection); }
inline Intersections& getIntersections() { return _parent ? _parent->_intersections : _intersections; }
inline Intersection getFirstIntersection() { Intersections& intersections = getIntersections(); return intersections.empty() ? Intersection() : *(intersections.begin()); }
public:
@ -199,12 +219,24 @@ class OSGUTIL_EXPORT IntersectionVisitor : public osg::NodeVisitor
/** Get the const read callback.*/
const ReadCallback* getReadCallback() const { return _readCallback.get(); }
void pushWindowMatrix(osg::RefMatrix* matrix) { _windowStack.push_back(matrix); }
void pushWindowMatrix(osg::Viewport* viewport) { _windowStack.push_back(new osg::RefMatrix( viewport->computeWindowMatrix()) ); }
void popWindowMatrix() { _windowStack.pop_back(); }
osg::RefMatrix* getWindowMatrix() { return _windowStack.empty() ? 0 : _windowStack.back().get(); }
osg::RefMatrix* getProjectionMatrix() { return _projectionStack.empty() ? 0 : _projectionStack.back().get(); }
osg::RefMatrix* getViewMatrix() { return _viewStack.empty() ? 0 : _viewStack.back().get(); }
osg::RefMatrix* getModelMatrix() { return _modelStack.empty() ? 0 : _modelStack.back().get(); }
void pushProjectionMatrix(osg::RefMatrix* matrix) { _projectionStack.push_back(matrix); }
void popProjectionMatrix() { _projectionStack.pop_back(); }
osg::RefMatrix* getProjectionMatrix() { return _projectionStack.empty() ? 0 : _projectionStack.back().get(); }
void pushViewMatrix(osg::RefMatrix* matrix) { _viewStack.push_back(matrix); }
void popViewMatrix() { _viewStack.pop_back(); }
osg::RefMatrix* getViewMatrix() { return _viewStack.empty() ? 0 : _viewStack.back().get(); }
void pushModelMatrix(osg::RefMatrix* matrix) { _modelStack.push_back(matrix); }
void popModelMatrix() { _modelStack.pop_back(); }
osg::RefMatrix* getModelMatrix() { return _modelStack.empty() ? 0 : _modelStack.back().get(); }
public:

86
src/osgUtil/IntersectionVisitor.cpp
View File

@ -219,18 +219,40 @@ LineSegmentIntersector::LineSegmentIntersector(const osg::Vec3d& start, const os
Intersector* LineSegmentIntersector::clone(osgUtil::IntersectionVisitor& iv)
{
osg::RefMatrix* model= iv.getModelMatrix();
if (model)
{
osg::Matrix inverse;
inverse.invert(*model);
return new LineSegmentIntersector(_start * inverse, _end * inverse, this);
}
else
if (_coordinateFrame==MODEL && iv.getModelMatrix()==0)
{
return new LineSegmentIntersector(_start, _end, this);
}
// compute the matrix that takes this Intersector from its CoordinateFrame into the local MODEL coordinate frame
// that geometry in the scene graph will always be in.
osg::Matrix matrix;
switch (_coordinateFrame)
{
case(WINDOW):
if (iv.getWindowMatrix()) matrix.preMult( *iv.getWindowMatrix() );
if (iv.getProjectionMatrix()) matrix.preMult( *iv.getProjectionMatrix() );
if (iv.getViewMatrix()) matrix.preMult( *iv.getViewMatrix() );
if (iv.getModelMatrix()) matrix.preMult( *iv.getModelMatrix() );
break;
case(PROJECTION):
if (iv.getProjectionMatrix()) matrix.preMult( *iv.getProjectionMatrix() );
if (iv.getViewMatrix()) matrix.preMult( *iv.getViewMatrix() );
if (iv.getModelMatrix()) matrix.preMult( *iv.getModelMatrix() );
break;
case(VIEW):
if (iv.getViewMatrix()) matrix.preMult( *iv.getViewMatrix() );
if (iv.getModelMatrix()) matrix.preMult( *iv.getModelMatrix() );
break;
case(MODEL):
if (iv.getModelMatrix()) matrix = *iv.getModelMatrix();
break;
}
osg::Matrix inverse;
inverse.invert(matrix);
return new LineSegmentIntersector(_start * inverse, _end * inverse, this);
}
bool LineSegmentIntersector::enter(const osg::Node& node)
@ -615,8 +637,12 @@ void IntersectionVisitor::reset()
void IntersectionVisitor::apply(osg::Node& node)
{
osg::notify(osg::NOTICE)<<"apply(Node&)"<<std::endl;
if (!enter(node)) return;
osg::notify(osg::NOTICE)<<"inside apply(Node&)"<<std::endl;
traverse(node);
leave();
@ -633,8 +659,12 @@ void IntersectionVisitor::apply(osg::Group& group)
void IntersectionVisitor::apply(osg::Geode& geode)
{
osg::notify(osg::NOTICE)<<"apply(Geode&)"<<std::endl;
if (!enter(geode)) return;
osg::notify(osg::NOTICE)<<"inside apply(Geode&)"<<std::endl;
for(unsigned int i=0; i<geode.getNumDrawables(); ++i)
{
intersect( geode.getDrawable(i) );
@ -699,7 +729,7 @@ void IntersectionVisitor::apply(osg::Transform& transform)
osg::ref_ptr<osg::RefMatrix> matrix = _modelStack.empty() ? new osg::RefMatrix() : new osg::RefMatrix(*_modelStack.back());
transform.computeLocalToWorldMatrix(*matrix,this);
_modelStack.push_back(matrix);
pushModelMatrix(matrix.get());
// now push an new intersector clone transform to the new local coordinates
push_clone();
@ -709,7 +739,7 @@ void IntersectionVisitor::apply(osg::Transform& transform)
// pop the clone.
pop_clone();
_modelStack.pop_back();
popModelMatrix();
// tidy up an cached cull variabes in the current intersector.
leave();
@ -720,7 +750,17 @@ void IntersectionVisitor::apply(osg::Projection& projection)
{
if (!enter(projection)) return;
pushProjectionMatrix(new osg::RefMatrix(projection.getMatrix()) );
// now push an new intersector clone transform to the new local coordinates
push_clone();
traverse(projection);
// pop the clone.
pop_clone();
popProjectionMatrix();
leave();
}
@ -728,9 +768,29 @@ void IntersectionVisitor::apply(osg::Projection& projection)
void IntersectionVisitor::apply(osg::CameraNode& camera)
{
if (!enter(camera)) return;
osg::notify(osg::NOTICE)<<"apply(CameraNode&)"<<std::endl;
// if (!enter(camera)) return;
osg::notify(osg::NOTICE)<<"inside apply(CameraNode&)"<<std::endl;
if (camera.getViewport()) pushWindowMatrix( camera.getViewport() );
pushProjectionMatrix( new osg::RefMatrix(camera.getProjectionMatrix()) );
pushViewMatrix( new osg::RefMatrix(camera.getViewMatrix()) );
pushModelMatrix( new osg::RefMatrix() );
// now push an new intersector clone transform to the new local coordinates
push_clone();
traverse(camera);
// pop the clone.
pop_clone();
popModelMatrix();
popViewMatrix();
popProjectionMatrix();
if (camera.getViewport()) popWindowMatrix();
leave();
// leave();
}