FGFS-4.1/OpenSceneGraph
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Added support for vertex ratios into LineSegmentIntersector.

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This commit is contained in:
Robert Osfield 2007-01-10 10:40:12 +00:00
parent 4954262eb0
commit c5082cb85c
4 changed files with 30 additions and 44 deletions
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48
examples/osgmovie/osgmovie.cpp
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@ -118,13 +118,10 @@ bool MovieEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIAction
{
osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
osg::notify(osg::NOTICE)<<"osgmovie - view = "<<view<<std::endl;
osgUtil::LineSegmentIntersector::Intersections intersections;
if (view && view->computeIntersections(ea.getX(), ea.getY(), nv->getNodePath().back(), intersections))
if (view && view->computeIntersections(ea.getX(), ea.getY(), nv->getNodePath(), intersections))
{
#if 1
osg::notify(osg::NOTICE)<<"osgmovie - Vertex interpolation not implemented yet"<<std::endl;
#else
// use the nearest intersection
const osgUtil::LineSegmentIntersector::Intersection& intersection = *(intersections.begin());
osg::Drawable* drawable = intersection.drawable.get();
@ -133,40 +130,18 @@ bool MovieEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIAction
if (vertices)
{
// get the vertex indices.
const osgUtil::LineSegmentIntersector::Intersection::IndexList& vil = intersection.indexList;
const osgUtil::LineSegmentIntersector::Intersection::IndexList& indices = intersection.indexList;
const osgUtil::LineSegmentIntersector::Intersection::RatioList& ratios = intersection.ratioList;
if (vil.size()==3)
if (indices.size()==3 && ratios.size()==3)
{
int i1 = vil[0];
int i2 = vil[1];
int i3 = vil[2];
osg::Vec3 v1 = (*vertices)[i1];
osg::Vec3 v2 = (*vertices)[i2];
osg::Vec3 v3 = (*vertices)[i3];
osg::Vec3 v = intersection.localIntersectionPoint;
unsigned int i1 = indices[0];
unsigned int i2 = indices[1];
unsigned int i3 = indices[2];
osg::Vec3 p1 = intersection.getLocalLineSegment()->start();
osg::Vec3 p2 = intersection.getLocalLineSegment()->end();
osg::Vec3 p12 = p1-p2;
osg::Vec3 v13 = v1-v3;
osg::Vec3 v23 = v2-v3;
osg::Vec3 p1v3 = p1-v3;
osg::Matrix matrix(p12.x(), v13.x(), v23.x(), 0.0,
p12.y(), v13.y(), v23.y(), 0.0,
p12.z(), v13.z(), v23.z(), 0.0,
0.0, 0.0, 0.0, 1.0);
osg::Matrix inverse;
inverse.invert(matrix);
osg::Vec3 ratio = inverse*p1v3;
// extract the baricentric coordinates.
float r1 = ratio.y();
float r2 = ratio.z();
float r3 = 1.0f-r1-r2;
float r1 = ratios[0];
float r2 = ratios[1];
float r3 = ratios[2];
osg::Array* texcoords = (geometry->getNumTexCoordArrays()>0) ? geometry->getTexCoordArray(0) : 0;
osg::Vec2Array* texcoords_Vec2Array = dynamic_cast<osg::Vec2Array*>(texcoords);
@ -188,7 +163,6 @@ bool MovieEventHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIAction
}
}
#endif
}
else
{

4
include/osgUtil/LineSegmentIntersector
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@ -45,7 +45,8 @@ class OSGUTIL_EXPORT LineSegmentIntersector : public Intersector
bool operator < (const Intersection& rhs) const { return ratio < rhs.ratio; }
typedef std::vector<unsigned int> IndexList;
typedef std::vector<unsigned int> IndexList;
typedef std::vector<double> RatioList;
double ratio;
osg::NodePath nodePath;
@ -54,6 +55,7 @@ class OSGUTIL_EXPORT LineSegmentIntersector : public Intersector
osg::Vec3d localIntersectionPoint;
osg::Vec3 localIntersectionNormal;
IndexList indexList;
RatioList ratioList;
unsigned int primitiveIndex;
};

18
src/osgUtil/LineSegmentIntersector.cpp
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@ -324,9 +324,21 @@ void LineSegmentIntersector::intersect(osgUtil::IntersectionVisitor& iv, osg::Dr
if (vertices)
{
osg::Vec3* first = &(vertices->front());
if (triHit._v1) hit.indexList.push_back(triHit._v1-first);
if (triHit._v2) hit.indexList.push_back(triHit._v2-first);
if (triHit._v3) hit.indexList.push_back(triHit._v3-first);
if (triHit._v1)
{
hit.indexList.push_back(triHit._v1-first);
hit.ratioList.push_back(triHit._r1);
}
if (triHit._v2)
{
hit.indexList.push_back(triHit._v2-first);
hit.ratioList.push_back(triHit._r2);
}
if (triHit._v3)
{
hit.indexList.push_back(triHit._v3-first);
hit.ratioList.push_back(triHit._r3);
}
}
}

2
src/osgViewer/View.cpp
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@ -413,8 +413,6 @@ bool View::computeIntersections(float x,float y, osg::NodePath& nodePath, osgUti
{
if (!_camera.valid()) return false;
osg::notify(osg::NOTICE)<<"View::computeIntersections(x,y,node,intersections) not implemented"<<std::endl;
osg::Matrix matrix = osg::computeWorldToLocal(nodePath) * _camera->getViewMatrix() * _camera->getProjectionMatrix();
double zNear = -1.0;