I have looked through all of the forum posts related to this issue and they
have implicitly but not explicitly told me how to solve my problem, but being
such a newbie I think I need some explicit help :-*
I am starting with two geoTiff files, one dem and one terrain. I convert to
ive using the following command line structure:
osgdem -t terrain.GEOTIFF -d dem.GEOTIFF -l 1 -o terrain.ive
I am able to load terrain.ive into my osg application and view it just fine. I
then want to be able to add objects (e.g. tree osg files) onto the terrain. At
this point I should mention that the geotiff files are in UTM WGS84 format. I
have been trying to add a tree onto the terrain with the following osg code:
Code:
/*
Load Scene Components from Files
*/
osg::ref_ptr<osg::Node> terrain =
osgDB::readNodeFile("data\\terrain\\terrain.ive");
osg::ref_ptr<osg::Node> tree =
osgDB::readNodeFile("data\\tree\\Tree1.osg");
/*
Group Scene Components
*/
/*Tree Transform*/
osg::ref_ptr<osg::PositionAttitudeTransform> treeXform = new
osg::PositionAttitudeTransform;
osg::Vec3 treePosit(?,?,?);
treeXform->setPosition( treePosit );
osg::Vec3 treeScale(1,1,1);
treeXform->setScale(treeScale);
/*Tree Rotation*/
osg::ref_ptr<osg::MatrixTransform> treeRotation = new
osg::MatrixTransform;
const double angle = osg::DegreesToRadians(0.0);
const Vec3d axis(1, 0, 0);
treeRotation->setMatrix(Matrix::rotate(angle, axis));
osg::ref_ptr<osg::Group> root = new osg::Group();
root->addChild(terrain);//add terrain to root
root->addChild(treeXform);//add translation to root
treeXform->addChild(treeRotation);//add rotation to translation
treeRotation->addChild(tree);//add tree to rotation
My question is whether this osg command / osg code is on track and I simply
need to figure out appropriate values for my treePosit variable or whether I
need to take a fundamentally different approach. I have read about attaching
objects to geotiffs that were converted using the --geocentric flag, but if I
add the --geocentric flag I get the following error:
ERROR 1: No PROJ.4 translation for source SRS, coordinate transformation
initialization has failed. I have also seen the --TERRAIN flag for osgdem, but
I definitely don't know if that's what I need.
I have also looked into using osgEarth, which from what I've read might take
care of more of this stuff automatically, but I'd rather figure this out using
VPB/osgdem since I think I'm really close to a solution. Thanks in advance for
any help!
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=42652#42652
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