/usr/include/osgEarthDrivers/engine_mp/DynamicLODScaleCallback is in libosgearth-dev 2.7.0+dfsg-2+b3.
This file is owned by root:root, with mode 0o644.
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/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2015 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#ifndef OSGEARTH_ENGINE_OSGTERRAIN_DYNAMIC_LOD_SCALE_CALLBACK_H
#define OSGEARTH_ENGINE_OSGTERRAIN_DYNAMIC_LOD_SCALE_CALLBACK_H 1
#include <osg/NodeCallback>
#include <osg/CullStack>
namespace osgEarth { namespace Drivers { namespace MPTerrainEngine
{
/**
* Cull callback that dynamically computes an LOD scale based on
* distance to the camera and a "fall off" metric. As the fall off
* increases, farther objects' LOD scale will increase. A good
* range for the fall-off number is 0..5.
*/
struct DynamicLODScaleCallback : public osg::NodeCallback
{
DynamicLODScaleCallback( float fallOff ) : _fallOff(fallOff) { }
/** dtor */
virtual ~DynamicLODScaleCallback() { }
void operator()( osg::Node* node, osg::NodeVisitor* nv )
{
osg::CullStack* cs = dynamic_cast<osg::CullStack*>(nv);
if ( cs )
{
osg::LOD* lod = static_cast<osg::LOD*>( node );
osg::Vec3 center = lod->getCenter();
osg::Vec3 eye = nv->getEyePoint();
osg::Vec3 eyeVec = eye; eyeVec.normalize();
float has = osg::clampAbove( eye.length() - 6356752.3142f, 0.0f );
float centerToEye = nv->getDistanceToViewPoint(center, false);
float bsToEye = centerToEye - lod->getChild(0)->getBound().radius();
float scaleAdj = 1.0f;
if ( bsToEye > has )
{
float denom = osg::maximum(0.1f, (1.0f/_fallOff)) * 10000.0f;
scaleAdj = osg::clampBetween( log10f(bsToEye/denom), 1.0f, 3.0f );
//OE_INFO << LC
// << std::fixed
// << "centerToEye=" << centerToEye
// << ", bsToEye=" << bsToEye
// << ", scaleAdj=" << scaleAdj
// << std::endl;
}
float lodScale = cs->getLODScale();
cs->setLODScale( lodScale * scaleAdj );
traverse( node, nv );
cs->setLODScale( lodScale );
}
else
{
traverse( node, nv );
}
}
float _fallOff;
};
} } } // namespace osgEarth::Drivers::MPTerrainEngine
#endif //OSGEARTH_ENGINE_OSGTERRAIN_DYNAMIC_LOD_SCALE_CALLBACK_H
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