Spherical coordinate projection. More...
#include <Inventor/projection/SbSphericalProjection.h>
Public Member Functions | |
SbSphericalProjection () | |
SbSphericalProjection (SoProjection *node) | |
virtual | ~SbSphericalProjection () |
virtual void | inverse (SbVec3f &point) |
virtual bool | getProjectedBoundingBox (SbBox3f &bbox) |
Spherical coordinate projection.
This class performs a spherical coordinate projection and is normally used with an SoProjection or SoGeoProjection node.
Spherical coordinates can be represented using the usual coordinate classes (SbVec3f, SoMFVec3f, etc) but the three values are considered to be
The parameters are :
Name | Type | Index | Default |
radius | float | 0 | 0 |
scaleRatio | float | 1 | 1 |
The radius parameter is an offset added to each altitude value before projection. This is useful when the altitude values are, for example, relative to sea level.
The scaleRatio parameter is a multiplicative ratio applied to altitude values before projection. This is useful to exaggerate altitudes for visualization purposes.
The spherical projection of a point P(lon,lat,alt) is computed as follows:
newLon = lon * degreeToRadians newLat = lat * degreeToRadians newRadius = radius + alt * scaleRatio x = newRadius*cos(newlat)*cos(newlon) y = newRadius*cos(newlat)*sin(newlon) z = newRadius*sin(newlat)
SbSphericalProjection::SbSphericalProjection | ( | ) |
Constructor.
SbSphericalProjection::SbSphericalProjection | ( | SoProjection * | node | ) |
Constructor.
virtual SbSphericalProjection::~SbSphericalProjection | ( | ) | [virtual] |
Destructor.
virtual bool SbSphericalProjection::getProjectedBoundingBox | ( | SbBox3f & | bbox | ) | [virtual] |
Compute projected bounding box.
Reimplemented from SbProjection.
virtual void SbSphericalProjection::inverse | ( | SbVec3f & | point | ) | [virtual] |
Apply the inverse coordinate to one point. Modifies the given object.
Reimplemented from SbProjection.