SbSphericalProjection Class Reference
[Basics]
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) |
Detailed Description
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
- Longitude: an angle measured in degrees in the interval [-180,180]
- Latitude: an angle measured in degrees in the interval [-90,90]
- Altitude (or radius): a distance in 3D units greater than zero
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)
SEE ALSO
- See related examples:
Constructor & Destructor Documentation
| SbSphericalProjection::SbSphericalProjection | ( | ) |
Constructor.
| SbSphericalProjection::SbSphericalProjection | ( | SoProjection * | node | ) |
Constructor.
| virtual SbSphericalProjection::~SbSphericalProjection | ( | ) | [virtual] |
Destructor.
Member Function Documentation
| 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.
The documentation for this class was generated from the following file:
- Inventor/projection/SbSphericalProjection.h