Hi all!
I have two cameras and I want to see the same level of detail in camera
2 as in camera 1, no matter how far away the cameras are from any
objects containing LOD/PagedLOD nodes.
I'm inheriting from osgUtil::Cullvisitor. My class specialization knows
the position of camera 1 in world space.
I am overriding osgUtil::CullVisitor::getDistanceToEyePoint(const
osg::Vec3& pos, bool withLODScale).
The idea is to compute the position pos in world space and then compute
the distance to the position of camera 1 and return this value instead.
Here's my code:
class UTIL_LODOverridableCullVisitor : public osgUtil::CullVisitor
{
public:
UTIL_LODOverridableCullVisitor()
{
m_override = false;
}
void enable_override(const osg::Vec3& cam_pos_world)
{
m_cam_pos_world = cam_pos_world;
m_override = true;
}
void disable_override()
{
m_override = false;
}
inline virtual float getDistanceToEyePoint(const osg::Vec3& pos,
bool withLODScale) const
{
if(m_override) {
osg::Vec3d pos_world = ???; // here I failed terribly :-(
if(withLODScale)
return (pos_world-m_cam_pos_world).length()*getLODScale();
else
return (pos_world-m_cam_pos_world).length();
} else {
return osgUtil::CullVisitor::getDistanceToEyePoint(pos,
withLODScale);
}
}
private:
bool m_override;
osg::Vec3d m_cam_pos_world;
};
enable_override() is called just before the cullvisitor enters the node
of camera 2
disable_override() is called just after, so the override-code is only
executed for nodes that are viewed by camera 2.
How can i compute the position of the node in world space?
Or is there a more elegant way to do this?
Many thanks,
helb
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