SbSphereSheetProjector(3)

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version 4.0.10 · 4 versions
, in fedora 43, fedora 44

💖 SbSphereSheetProjector(3) — the Coin era 💖

okay bestie, welcome to the Coin manual, section 3. This one's called SbSphereSheetProjector and it is genuinely one of the cutest little projector classes in the whole library. Buckle up, we're going 2D ➡️ 3D. 🦋

✨ NAME ✨

SbSphereSheetProjector — the class that projects 2D points to 3D points on a sheet covering a spherical shape. it's giving "flat bestie draped over a ball", no cap. 🎀

🌸 SYNOPSIS 🌸

#include <Inventor/projectors/SbSphereSheetProjector.h>

Inherits SbSphereProjector. it's a whole family tree, iykyk. 👑

🌈 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)

💜 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
  • virtual SbBool tryProject (const SbVec2f &point, const float epsilon, SbVec3f &result)

🫶 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. literally its whole personality. 💅

The following standalone 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 <cstdio>
#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:

[image here, bestie — the original just shows you the pretty picture] 🌈

🎀 Constructor & Destructor Documentation 🎀

💖 SbSphereSheetProjector::SbSphereSheetProjector (const SbBool orienttoeye = TRUE)

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

orienttoeye decides whether or not the sheet should always be oriented towards the viewer. so like, does the sheet keep eye contact with you at all times or not. main character behaviour fr fr. 👀

💖 SbSphereSheetProjector::SbSphereSheetProjector (const SbSphere & sph, const SbBool orienttoeye = TRUE)

Constructor with explicit definition of projection sphere. you bring your own ball, iconic. 🏀

💅 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. so like, you made the clone, you clean up the clone. periodt. 🫡

⚠️ 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 are 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.

bestie that last part is NOT a vibe. same CRT library or else. no cap. 💀

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. so it knows what it is and it does the thing accordingly. 💫

Implements SbProjector.

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

Returns rotation on the projection surface which reorients point1 to point2. it's literally just spinning point1 around until it's point2. slay. 🔄

Implements SbSphereProjector.

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

Recalculates projection surface settings after changes to the parameters. it's the lil refresh moment after you change stuff. 🧼

🌟 Member Data Documentation 🌟

🦋 SbVec3f SbSphereSheetProjector::workingProjPoint [protected]

Last projected point, in the working space coordinate system. the most recent glow-up location. 📍

🦋 SbVec3f SbSphereSheetProjector::planePoint [protected]

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

🦋 SbVec3f SbSphereSheetProjector::planeDir [protected]

Normal vector of the plane defining the orientation of the sheet. it's the direction the sheet is facing, the whole aesthetic direction tbh. 🧭

🦋 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. translation: not for you bestie, it's a library thing, move along. 🙈

🦋 SbPlane SbSphereSheetProjector::tolPlane [protected]

The tolerance value specifying how much of the sphere is "above" the sheet. the lil threshold of what counts as on top. ⬆️

🫶 Author 🫶

Generated automatically by Doxygen for Coin from the source code.

and that's the whole page, bestie!! 🎉 this was Version 4.0.10, dated Thu Jun 25 2026 00:00:00, filed under SbSphereSheetProjector(3). go project something gorgeous. mwah. 💋 🌈✨💖

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