FGFS-4.1/OpenSceneGraph
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Improved the terrain intersection code so that it produces more stable terrain movements.

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This commit is contained in:
Robert Osfield 2008-08-03 20:35:45 +00:00
parent f81ff952a2
commit 268b79d03f
1 changed files with 25 additions and 13 deletions
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38
src/osgGA/TerrainManipulator.cpp
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@ -475,22 +475,34 @@ bool TerrainManipulator::calcMovement()
CoordinateFrame coordinateFrame = getCoordinateFrame(_center);
// need to reintersect with the terrain
double distance = _node->getBound().radius()*0.1f;
osg::Vec3d start_segment = _center + getUpVector(coordinateFrame) * distance;
osg::Vec3d end_segment = start_segment - getUpVector(coordinateFrame) * (2.0f*distance);
osg::notify(INFO)<<"start="<<start_segment<<"\tend="<<end_segment<<"\tupVector="<<getUpVector(coordinateFrame)<<std::endl;
osg::Vec3d ip;
if (intersect(start_segment,end_segment, ip))
double distance = _node->getBound().radius()*0.25f;
osg::Vec3d ip1;
osg::Vec3d ip2;
bool hit_ip1 = intersect(_center, _center + getUpVector(coordinateFrame) * distance, ip1);
bool hit_ip2 = intersect(_center, _center - getUpVector(coordinateFrame) * distance, ip2);
if (hit_ip1)
{
notify(INFO) << "Hit terrain ok"<< std::endl;
_center = ip;
if (hit_ip2)
{
_center = (_center-ip1).length2() < (_center-ip2).length2() ?
ip1 :
ip2;
hitFound = true;
}
else
{
_center = ip1;
hitFound = true;
}
}
else if (hit_ip2)
{
_center = ip2;
hitFound = true;
}
if (!hitFound)
{
// ??