Chris 'Xenon' Hanson wrote:
> On 9/13/2011 12:44 PM, Ethan Fahy wrote:
>
> > Now I just need to find a forum post I saw that shows how to place an
> > object on the terrain based on an lat/lot...
> >
>
> http://forum.openscenegraph.org/viewtopic.php?t=6734
>
After reading those postings it looks like the relevant part to my case would
be the following:
Code:
This is how you would place your model...
osg::Matrixd position;
ellipsoid->computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadia
ns(lat),
osg::DegreesToRadians(lon), altitude, position);
transform->setMatrix(position);
where "transform" is an osg::MatrixTransform node that has your model as a
child node.
The X,Y,Z geocentric Cartesian coordinates from the lat,lon,alt can be
extracted by:
osg::Vec3d pos = position.getTrans();
I'm a little unclear on the full implementation of this though. Do I wrap that
code up into something like this after reading in both the terrain and a tree
for example:
Code:
osg::ref_ptr<osg::EllipsoidModel> ellipsoid = new osg::EllipsoidModel();
osg::ref_ptr<osg::MatrixTransform> transform = new
osg::MatrixTransform();
float lat = 50.0;
float lon = 50.0;
float altitude = 1000.0;
osg::Matrixd position;
ellipsoid->computeLocalToWorldTransformFromLatLongHeight(osg::DegreesToRadians(lat),osg::DegreesToRadians(lon),
altitude, position);
transform->setMatrix(position);
osg::ref_ptr<osg::Group> root = new osg::Group();
root->addChild(terrain);
root->addChild(transform);
transform->addChild(tree);
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=42745#42745
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