I've made a bit of progress here, and I think what I need to do is:
- Position a node using the Latitude/Longitude/Altitude from a GPS
- Use a NodeTrackerManipulator on that node (the "povNode")
- Load the VirtualPlanetBuilder terrain into a second node "terrainNode"
- Set up a CoordinateSystemNode / EllipsoidModel to wrap the terrainNode.
- Maintain two PositionAttitudeTransforms wrapping the povNode and the
terrainNode.
Inside the while(!done) loop:
double x = 0;
double y = 0;
double z = 0;
csn->getEllipsoidModel()->convertLatLongHeightToXYZ(osg::DegreesToRadians(latitude),osg::DegreesToRadians(longitude),
altitude, x, y, z);
povXForm->setPosition( osg::Vec3(x, y, z));
terrainXForm->setAttitude(osg::Quat(osg::DegreesToRadians( yaw ),
osg::Vec3(0,0,1),
osg::DegreesToRadians( pitch ),
osg::Vec3(1,0,0),
osg::DegreesToRadians( roll ),
osg::Vec3(0,1,0)));
viewer.frame();
This seems to me like it should be reasonable, but something is wrong. I
believe it could be with the CoordinateSystemNode since I'm not adding
the CSN to the view root... I'm adding the terrainNode to the CSN and to
the PAT, and then adding the PAT to the view root group. My thinking
here is that I don't want to position the terrain at that point, I want
to position the camera (using the NodeTrackerManipulator) - but I want
to tilt the terrain so that it would match the "out the window" view
from a plane at that point.
At any rate, I get a blank blue screen when I try to use the povXForm
and the terrainXForm, even when hard coding the lat/long/altitude to
values that make sense. The terrain just never seems to render.
I appreciate anyone who made it to the end of this :)
-Matthew
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