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Added code for computing the frustum dimensions in local coords to the overlay node

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Robert Osfield
2007-05-16 11:32:29 +00:00
parent 752942addb
commit 310d6d2fc8
1 changed files with 59 additions and 5 deletions
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64
src/osgSim/OverlayNode.cpp
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@@ -396,30 +396,84 @@ void OverlayNode::traverse_VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY(osg::NodeVis
corners.push_back(osg::Vec3d(-1.0,-1.0,-1.0));
corners.push_back(osg::Vec3d(1.0,-1.0,-1.0));
corners.push_back(osg::Vec3d(1.0,1.0,-1.0));
corners.push_back(osg::Vec3d(-1.0,1.0,1.0));
corners.push_back(osg::Vec3d(-1.0,1.0,-1.0));
corners.push_back(osg::Vec3d(-1.0,-1.0,1.0));
corners.push_back(osg::Vec3d(1.0,-1.0,1.0));
corners.push_back(osg::Vec3d(1.0,1.0,1.0));
corners.push_back(osg::Vec3d(-1.0,1.0,1.0));
osg::Vec3d center;
for(Corners::iterator itr = corners.begin();
itr != corners.end();
++itr)
{
*itr = *itr * inverseMVP;
center += *itr;
// osg::notify(osg::NOTICE)<<" corner ="<<*itr<<std::endl;
}
center /= 8.0;
osg::Vec3d center_near = (corners[0]+corners[1]+corners[2]+corners[3])*0.25;
osg::Vec3d center_far = (corners[4]+corners[5]+corners[6]+corners[7])*0.25;
osg::Vec3d center = (center_near+center_far)*0.5;
osg::Vec3d frustum_axis = (center_far-center_near);
frustum_axis.normalize();
double diagonal = (corners[0]-corners[7]).length();
float diagonal_near = (corners[0]-center_near).length();
float diagonal_far = (corners[7]-center_far).length();
osg::notify(osg::NOTICE)<<" center ="<<center<<" diagonal ="<<diagonal<<std::endl;
osg::notify(osg::NOTICE)<<" frustum_axis ="<<frustum_axis<<" diagonal_near ="<<diagonal_near<<" diagonal_far="<<diagonal_far<<std::endl;
// see if we are within a coordinate system node.
osg::CoordinateSystemNode* csn = 0;
osg::NodePath& nodePath = nv.getNodePath();
for(osg::NodePath::reverse_iterator itr = nodePath.rbegin();
itr != nodePath.rend() && csn==0;
++itr)
{
csn = dynamic_cast<osg::CoordinateSystemNode*>(*itr);
}
osg::Vec3d lookVector(0.0,0.0,-1.0);
if (csn)
{
lookVector = -center;
lookVector.normalize();
}
osg::Vec3d sideVector = lookVector ^ frustum_axis;
sideVector.normalize();
osg::Vec3d upVector = sideVector ^ lookVector;
upVector.normalize();
osg::notify(osg::NOTICE)<<" lookVector ="<<lookVector<<std::endl;
double min_side = DBL_MAX;
double max_side = -DBL_MAX;
double min_up = DBL_MAX;
double max_up = -DBL_MAX;
for(Corners::iterator itr = corners.begin();
itr != corners.end();
++itr)
{
osg::Vec3d delta = *itr - center;
double distance_side = delta * sideVector;
double distance_up = delta * upVector;
if (distance_side<min_side) min_side = distance_side;
if (distance_side>max_side) max_side = distance_side;
if (distance_up<min_up) min_up = distance_up;
if (distance_up>max_up) max_up = distance_up;
}
osg::notify(osg::NOTICE)<<" upVector ="<<upVector<<" min="<<min_side<<" max="<<max_side<<std::endl;
osg::notify(osg::NOTICE)<<" sideVector ="<<sideVector<<" min="<<min_up<<" max="<<max_up<<std::endl;
osg::notify(osg::NOTICE)<<std::endl;
}
else
{