SbSphereSheetProjector(3)

✨ SbSphereSheetProjector(3) ✨

okay bestie, this is the manual page for SbSphereSheetProjector(3) from the Library Functions Manual. Buckle up, it's giving projector lore. 💖

💖 NAME 💖

SbSphereSheetProjector — the SbSphereSheetProjector class projects 2D points to 3D points on a sheet covering a spherical shape. 🦋

🌸 SYNOPSIS 🌸

#include <Inventor/projectors/SbSphereSheetProjector.h>

Inherits SbSphereProjector.

✨ Public Member Functions ✨

• SbSphereSheetProjector (const SbBool orienttoeye=1)
• SbSphereSheetProjector (const SbSphere &sph, const SbBool orienttoeye=1)
• virtual SbProjector * copy (void) const
• virtual SbVec3f project (const SbVec2f &point)
• virtual SbRotation getRotation (const SbVec3f &point1, const SbVec3f &point2)

💫 Public Member Functions inherited from SbSphereProjector 💫

• SbVec3f projectAndGetRotation (const SbVec2f &point, SbRotation &rot)
• void setSphere (const SbSphere &sph)
• const SbSphere & getSphere (void) const
• void setOrientToEye (const SbBool orienttoeye)
• SbBool isOrientToEye (void) const
• void setFront (const SbBool infront)
• SbBool isFront (void) const
• SbBool isPointInFront (const SbVec3f &point) const
• virtual void setWorkingSpace (const SbMatrix &space)

🫶 Public Member Functions inherited from SbProjector 🫶

• virtual void setViewVolume (const SbViewVolume &vol)
• const SbViewVolume & getViewVolume (void) const
• const SbMatrix & getWorkingSpace (void) const

🔒 Protected Member Functions 🔒

• void setupPlane (void)

🧚 Protected Member Functions inherited from SbSphereProjector 🧚

• SbSphereProjector (const SbBool orienttoeye)
• SbSphereProjector (const SbSphere &s, const SbBool orienttoeye)
• SbBool intersectSphereFront (const SbLine &l, SbVec3f &result)

🛡️ Protected Member Functions inherited from SbProjector 🛡️

• SbProjector (void)
• virtual ~SbProjector ()
• SbLine getWorkingLine (const SbVec2f &point) const
• float findVanishingDistance (void) const
• SbBool verifyProjection (const SbVec3f &projpt) const

🎀 Protected Attributes 🎀

• SbVec3f workingProjPoint
• SbVec3f planePoint
• SbVec3f planeDir
• float planeDist
• SbPlane tolPlane

🌈 Protected Attributes inherited from SbSphereProjector 🌈

• SbBool intersectFront
• SbSphere sphere
• SbBool orientToEye
• SbBool needSetup
• SbVec3f lastPoint

💜 Protected Attributes inherited from SbProjector 💜

• SbViewVolume viewVol
• SbMatrix worldToWorking
• SbMatrix workingToWorld

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 project into 3D when mapped with an SbSphereSheetProjector. It outputs the resulting projections as an SoPointSet in an 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 ascii\n\n"
                "Separator {\n"
                "  Coordinate3 {\n"
                "    point [\n");

  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, "\t%f %f %f,\n", v[0], v[1], v[2]);
    }
  }

  (void)fprintf(stdout, "      ]\n"
                "    }\n"
                "  DrawStyle { pointSize 2 }\n"
                "  PointSet { }\n"
                "}\n");

  return 0;
}

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

Constructor & Destructor Documentation 🎀

SbSphereSheetProjector::SbSphereSheetProjector (const SbBool orienttoeye = 1) 💅

Constructor. Uses default sphere definition, see SbSphereProjector::SbSphereProjector().

orienttoeye decides whether or not the sheet should always be oriented towards the viewer.

References SbSphereProjector::SbSphereProjector().

Referenced by copy().

SbSphereSheetProjector::SbSphereSheetProjector (const SbSphere & sph, const SbBool orienttoeye = 1) 🌸

Constructor with explicit definition of projection sphere.

References SbSphereProjector::SbSphereProjector().

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.

References SbSphereSheetProjector().

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.

References SbLine::getDirection(), SbProjector::getWorkingLine(), SbSphereProjector::intersectFront, SbSphereProjector::intersectSphereFront(), SbSphereProjector::isOrientToEye(), SbSphereProjector::lastPoint, SbSphereProjector::needSetup, SbVec3f::negate(), planeDir, planePoint, SoDebugError::postWarning(), setupPlane(), SbLine::setValue(), SbSphereProjector::sphere, tolPlane, and workingProjPoint.

SbRotation SbSphereSheetProjector::getRotation (const SbVec3f & point1, const SbVec3f & point2) [virtual] 🦋

Returns rotation on the projection surface which re-orients point1 to point2.

Implements SbSphereProjector.

References SbSphereProjector::needSetup, planePoint, and setupPlane().

void SbSphereSheetProjector::setupPlane (void ) [protected] 🔒

Recalculates projection surface settings after changes to the parameters.

References SbSphereProjector::intersectFront, SbSphereProjector::needSetup, SbSphereProjector::orientToEye, planeDir, planeDist, planePoint, SoDebugError::postWarning(), SbSphereProjector::sphere, tolPlane, SbProjector::viewVol, and SbProjector::worldToWorking.

Referenced by getRotation(), and project().

Member Data Documentation 🌈

SbVec3f SbSphereSheetProjector::workingProjPoint [protected] 💜

Last projected point, in the working space coordinate system.

Referenced by project().

SbVec3f SbSphereSheetProjector::planePoint [protected] 🎀

Position of the center of the sphere in the plane of the hyperbolic sheet.

Referenced by getRotation(), project(), and setupPlane().

SbVec3f SbSphereSheetProjector::planeDir [protected] 🦋

Normal vector of the plane defining the orientation of the sheet.

Referenced by project(), and setupPlane().

float 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.

Referenced by setupPlane().

SbPlane SbSphereSheetProjector::tolPlane [protected] 🌸

The tolerance value specifying how much of the sphere is "above" the sheet.

Referenced by project(), and setupPlane().

Author 👑

Generated automatically by Doxygen for Coin from the source code.

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Coin, Version 2.5.0 — and the footer is just that plus SbSphereSheetProjector(3), bestie. No date in sight, so consider this your cute sign-off. 🫶✨