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NAME

       SbSphereSheetProjector -

       The SbSphereSheetProjector class projects 2D points to 3D points on a sheet covering a
       spherical shape.

       The following stand-alone example shows how screen space coordinates projects into 3D when
       mapped with an SbSphereSheetProjector. It outputs the resulting projections as an
       SoPointSet in a Inventor-file on stdout:

SYNOPSIS

       #include <Inventor/projectors/SbSphereSheetProjector.h>

       Inherits SbSphereProjector.

   Public Member Functions
       SbSphereSheetProjector (const SbBool orienttoeye=TRUE)
       SbSphereSheetProjector (const SbSphere &sph, const SbBool orienttoeye=TRUE)
       virtual SbProjector * copy (void) const
       virtual SbVec3f project (const SbVec2f &point)
       virtual SbRotation getRotation (const SbVec3f &point1, const SbVec3f &point2)

   Protected Member Functions
       void setupPlane (void)

   Protected Attributes
       SbVec3f workingProjPoint
       SbVec3f planePoint
       SbVec3f planeDir
       float planeDist
       SbPlane tolPlane

Detailed Description

       The SbSphereSheetProjector class projects 2D points to 3D points on a sheet covering a
       spherical shape.

       The following stand-alone example shows how screen space coordinates projects into 3D when
       mapped with an SbSphereSheetProjector. It outputs the resulting projections as an
       SoPointSet in a Inventor-file on stdout:

         #include <stdio.h>
         #include <Inventor/SbLinear.h>
         #include <Inventor/projectors/SbSphereSheetProjector.h>
         #include <Inventor/SoDB.h>

         int
         main(void)
         {
           SoDB::init();

           const float START = 0.0f;
           const float END = 1.0f;
           const float STEPS = 50.0f;
           const float STEPSIZE = ((END - START) / STEPS);

           SbSphere s(SbVec3f(0, 0, 0), 0.8);
           SbSphereSheetProjector ssp(s, TRUE); // last argument is orientToEye

           SbViewVolume volume;
           volume.ortho(-1, 1, -1, 1, -1, 1);
           ssp.setViewVolume(volume);

           (void)fprintf(stdout, '#Inventor V2.1 ascii0
                         'Separator {0
                         '  Coordinate3 {0
                         '    point [0);

           for (float i=START; i <= END; i += STEPSIZE) {
             for (float j=START; j <= END; j += STEPSIZE) {
               SbVec3f v = ssp.project(SbVec2f(j, i));
               (void)fprintf(stdout, '%f %f %f,0, v[0], v[1], v[2]);
             }
           }

           (void)fprintf(stdout, '      ]0
                         '    }0
                         '  DrawStyle { pointSize 2 }0
                         '  PointSet { }0
                         '}0);

           return 0;
         }

       The projections to 3D points in the resulting Inventor-file looks like this:

Constructor & Destructor Documentation

   SbSphereSheetProjector::SbSphereSheetProjector (const SbBoolorienttoeye = TRUE) Constructor.
       Uses default sphere defintion, see SbSphereProjector::SbSphereProjector().
       orienttoeye decides whether or not the sheet should always be oriented towards the viewer.

   SbSphereSheetProjector::SbSphereSheetProjector (const SbSphere &sph, const SbBoolorienttoeye =
       TRUE) Constructor with explicit definition of projection sphere.

Member Function Documentation

   SbProjector * SbSphereSheetProjector::copy (void) const [virtual] Construct and return a copy
       of this projector. The caller is responsible for destructing the new instance.
       Note that if the Coin library has been built as a DLL under Microsoft Windows and you use
       this method from application code, you must make sure that both the Coin DLL and the
       application executable is using the same instance of a C Run-Time (CRT) library.
       Otherwise, you will get memory heap corruption upon deallocating the returned instances,
       eventually leading to mysterious crashes.

       Implements SbProjector.

   SbVec3f SbSphereSheetProjector::project (const SbVec2f &point) [virtual] Project the 2D point
       from normalized viewport coordinates to a 3D point. The mapping will be done in accordance
       with the type of the projector.
       Implements SbProjector.

   SbRotation SbSphereSheetProjector::getRotation (const SbVec3f &point1, const SbVec3f &point2)
       [virtual] Returns rotation on the projection surface which re-orients point1 to point2.
       Implements SbSphereProjector.

   void SbSphereSheetProjector::setupPlane (void) [protected] Recalculates projection surface
       settings after changes to the parameters.

Member Data Documentation

   SbSphereSheetProjector::workingProjPoint [protected] Last projected point, in the working
       space coordinate system.
   SbSphereSheetProjector::planePoint [protected] Position of the center of the sphere in the
       plane of the hyberbolic sheet.
   SbSphereSheetProjector::planeDir [protected] Normal vector of the plane defining the
       orientation of the sheet.
   SbSphereSheetProjector::planeDist [protected] This API member is considered internal to the
       library, as it is not likely to be of interest to the application programmer.
   SbSphereSheetProjector::tolPlane [protected] The tolerance value specifying how much of the
       sphere is 'above' the sheet.

Author

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