/usr/include/osgEarth/HeightFieldUtils is in libosgearth-dev 2.5.0+dfsg-2+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* 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_HEIGHTFIELDUTILS_H
#define OSGEARTH_HEIGHTFIELDUTILS_H
#include <osgEarth/Common>
#include <osgEarth/GeoData>
#include <osg/Shape>
#include <osg/CoordinateSystemNode>
#include <osg/ClusterCullingCallback>
#include <osgTerrain/ValidDataOperator>
namespace osgEarth
{
struct HeightFieldNeighborhood
{
osg::ref_ptr<osg::HeightField> _center;
osg::ref_ptr<osg::HeightField> _neighbors[8];
osg::HeightField* getNeighbor(int xoffset, int yoffset) const {
if ( xoffset == 0 && yoffset == 0 ) return _center.get();
int index = 3*(yoffset+1)+(xoffset+1);
if (index > 4) index--;
return _neighbors[index].get();
}
void setNeighbor(int xoffset, int yoffset, osg::HeightField* hf) {
if ( xoffset == 0 && yoffset == 0 ) {
_center = hf;
}
else {
int index = 3*(yoffset+1)+(xoffset+1);
if (index > 4) index--;
_neighbors[index] = hf;
}
}
void getNeighborForNormalizedLocation(double nx, double ny, osg::ref_ptr<osg::HeightField>& hf, double& out_nx, double& out_ny) const {
int xoffset = nx < 0.0 ? -1 : nx > 1.0 ? 1 : 0;
int yoffset = ny < 0.0 ? 1 : ny > 1.0 ? -1 : 0;
if ( xoffset != 0 || yoffset != 0 )
hf = getNeighbor(xoffset, yoffset);
else
hf = _center.get();
out_nx = nx < 0.0 ? 1.0+nx : nx > 1.0 ? nx-1.0 : nx;
out_ny = ny < 0.0 ? 1.0+ny : ny > 1.0 ? ny-1.0 : ny;
}
};
class OSGEARTH_EXPORT HeightFieldUtils
{
public:
/**
* Gets the interpolated height value at the specified fractional pixel position.
*/
static float getHeightAtPixel(
const osg::HeightField* hf,
double c, double r,
ElevationInterpolation interpoltion = INTERP_BILINEAR);
/**
* Gets the height value at the specified column and row, but instead of reading
* the actual height, interpolates a height based on the neighbors.
*/
static bool getInterpolatedHeight(
const osg::HeightField* hf,
unsigned c, unsigned r,
float& out_height,
ElevationInterpolation interpoltion = INTERP_BILINEAR);
/**
* Gets the interpolated height value at the specific geolocation.
*/
static float getHeightAtLocation(
const osg::HeightField* hf,
double x, double y,
double llx, double lly,
double dx, double dy,
ElevationInterpolation interpolation = INTERP_BILINEAR);
/**
* Gets the interpolated elevation at the specified "normalized unit location".
* i.e., nx => [0.0, 1.0], ny => [0.0, 1.0] where 0.0 and 1.0 are the opposing
* endposts of the heightfield.
*/
static float getHeightAtNormalizedLocation(
const osg::HeightField* hf,
double nx, double ny,
ElevationInterpolation interp = INTERP_BILINEAR);
/**
* Gets the interpolated elevation at the specified "normalized unit location".
* i.e., nx => [-1.0...2.0], ny => [-1.0...2.0] since it can query neighbors
* as well.
*/
static float getHeightAtNormalizedLocation(
const HeightFieldNeighborhood& hood,
double nx, double ny,
ElevationInterpolation interp = INTERP_BILINEAR);
/**
* Gets the normal vector at the specified "normalized unit location".
* i.e., nx => [0.0, 1.0], ny => [0.0, 1.0] where 0.0 and 1.0 are the opposing
* endposts of the heightfield.
*/
static bool getNormalAtNormalizedLocation(
const osg::HeightField* hf,
double nx, double ny,
osg::Vec3& output,
ElevationInterpolation interp = INTERP_BILINEAR);
/**
* Scales all the height values in a heightfield from scalar units to "linear degrees".
* The only purpose of this is to show reasonable height values in a projected
* Plate Carre map (in which vertical units are not well defined).
*/
static void scaleHeightFieldToDegrees( osg::HeightField* hf );
/**
* Creates a heightfield containing MSL heights for the specified extent.
* If the SRS (in GeoExtent) has a vertical datum, the height values will be those of
* its reference geoid. If there is no vertical datum, we assume that MSL == the reference
* ellipsoid, and all the HF values will be zero.
*/
static osg::HeightField* createReferenceHeightField(
const GeoExtent& ex,
unsigned numCols,
unsigned numRows );
/**
* Subsamples a heightfield to the specified extent.
*/
static osg::HeightField* createSubSample(
osg::HeightField* input,
const GeoExtent& inputEx,
const GeoExtent& outputEx,
ElevationInterpolation interpolation = INTERP_BILINEAR);
/**
* Resizes a heightfield, keeping the corner values the same and
* resampling the internal posts.
*/
static osg::HeightField* resampleHeightField(
osg::HeightField* input,
const GeoExtent& inputEx,
int newX,
int newY,
ElevationInterpolation interp = INTERP_BILINEAR );
/**
* Resolves any "invalid" height values in the hieghtfield, replacing them
* with valid values from a Geoid (or zero if no geoid).
*/
static void resolveInvalidHeights(
osg::HeightField* grid,
const GeoExtent& extent,
float invalidValue,
const Geoid* geoid );
/**
* Creates a new cluster culler based on a heightfield.
* Cluster cullers are for geocentric maps only, and therefore requires
* the ellipsoid model.
*/
static osg::NodeCallback* createClusterCullingCallback(
osg::HeightField* grid,
const osg::EllipsoidModel* em,
float verticalScale =1.0f );
};
/**
* A collection of ValidDataOperators. All operators must pass to be considered valid.
*/
struct OSGEARTH_EXPORT CompositeValidValueOperator : public osgTerrain::ValidDataOperator
{
typedef std::vector<osg::ref_ptr<osgTerrain::ValidDataOperator> > ValidDataOperatorList;
ValidDataOperatorList& getOperators() { return _operators;}
virtual bool operator() (float value) const
{
for (ValidDataOperatorList::const_iterator itr = _operators.begin(); itr != _operators.end(); ++itr)
{
if (!(*itr->get())(value)) return false;
}
return true;
}
ValidDataOperatorList _operators;
};
/**
* Visitor that replaces "invalid" data values with a known value.
*/
struct OSGEARTH_EXPORT ReplaceInvalidDataOperator : public osg::Referenced
{
ReplaceInvalidDataOperator();
virtual void operator()(osg::HeightField* heightField);
osgTerrain::ValidDataOperator* getValidDataOperator() { return _validDataOperator.get(); }
void setValidDataOperator(osgTerrain::ValidDataOperator* validDataOperator) { _validDataOperator = validDataOperator; }
float getReplaceWith() { return _replaceWith; }
void setReplaceWith( float replaceWith ) { _replaceWith = replaceWith; }
osg::ref_ptr<osgTerrain::ValidDataOperator> _validDataOperator;
float _replaceWith;
};
/**
* Visitor that replaces "invalid" data values with a default value.
*/
struct OSGEARTH_EXPORT FillNoDataOperator : public osg::Referenced
{
FillNoDataOperator();
virtual void operator()(osg::HeightField* heightField);
osgTerrain::ValidDataOperator* getValidDataOperator() { return _validDataOperator.get(); }
void setValidDataOperator(osgTerrain::ValidDataOperator* validDataOperator) { _validDataOperator = validDataOperator; }
float getDefaultValue() { return _defaultValue; }
void setDefaultValue(float defaultValue) { _defaultValue = defaultValue; }
osg::ref_ptr<osgTerrain::ValidDataOperator> _validDataOperator;
float _defaultValue;
};
}
#endif //OSGEARTH_HEIGHTFIELDUTILS_H
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