NAME

       SbPlane -

       The SbPlane class represents a plane in 3D space.

       SbPlane is used by many other classes in Coin. It provides a way of representing a plane,
       specified by a plane normal vector and a distance from the origin of the coordinate
       system.

SYNOPSIS

       #include <Inventor/SbLinear.h>

   Public Member Functions
       SbPlane (void)
       SbPlane (const SbVec3f &normal, const float D)
       SbPlane (const SbVec3f &p0, const SbVec3f &p1, const SbVec3f &p2)
       SbPlane (const SbVec3f &normal, const SbVec3f &point)
       void offset (const float d)
       SbBool intersect (const SbLine &l, SbVec3f &intersection) const
       void transform (const SbMatrix &matrix)
       SbBool isInHalfSpace (const SbVec3f &point) const
       float getDistance (const SbVec3f &point) const
       const SbVec3f & getNormal (void) const
       float getDistanceFromOrigin (void) const
       void print (FILE *file) const
       SbBool intersect (const SbPlane &pl, SbLine &line) const

   Friends
       int operator== (const SbPlane &p1, const SbPlane &p2)
       int operator!= (const SbPlane &p1, const SbPlane &p2)

Detailed Description

       The SbPlane class represents a plane in 3D space.

       SbPlane is used by many other classes in Coin. It provides a way of representing a plane,
       specified by a plane normal vector and a distance from the origin of the coordinate
       system.

Constructor & Destructor Documentation

   SbPlane::SbPlane (void)
       An SbPlane instantiated with the default constructor will be uninitialized.

   SbPlane::SbPlane (const SbVec3f &normalref, const floatD)
       Construct an SbPlane instance with a normal pointing in the given direction and the given
       shortest distance from the origin of the coordinate system to a point in the plane.

       normal must not be a null vector.

   SbPlane::SbPlane (const SbVec3f &p0, const SbVec3f &p1, const SbVec3f &p2)
       Construct an SbPlane with three points laying in the plane. Make sure p0, p1 and p2 are
       actually three distinct points, not on a line, when using this constructor.

   SbPlane::SbPlane (const SbVec3f &normalref, const SbVec3f &point)
       Construct an SbPlane from a normal and a point laying in the plane.

       normal must not be a null vector.

Member Function Documentation

   void SbPlane::offset (const floatd)
       Add the given offset d to the plane distance from the origin.

   SbBool SbPlane::intersect (const SbLine &l, SbVec3f &intersection) const
       Find the point on given line l intersecting the plane and return it in intersection. If
       the line is parallel to the plane, we return FALSE, otherwise TRUE.

       Do not pass an invalid line for the l parameter (i.e. with a null direction vector).

   void SbPlane::transform (const SbMatrix &matrix)
       Transform the plane by matrix.

       See Also:
           offset()

   SbBool SbPlane::isInHalfSpace (const SbVec3f &point) const
       Check if the given point lies in the halfspace of the plane which the plane normal vector
       is pointing.

   float SbPlane::getDistance (const SbVec3f &point) const
       Return the distance from point to plane. Positive distance means the point is in the
       plane's half space.

       This method is an extension specific to Coin versus the original SGI Inventor API.

   const SbVec3f & SbPlane::getNormal (void) const
       Return the plane's normal vector, which indicates which direction the plane is oriented.

       See Also:
           getDistanceFromOrigin().

   float SbPlane::getDistanceFromOrigin (void) const
       Return distance from origin of coordinate system to the point in the plane which is
       closest to the origin.

       See Also:
           getNormal().

   void SbPlane::print (FILE *fp) const
       Dump the state of this object to the file stream. Only works in debug version of library,
       method does nothing in an optimized build.

   SbBool SbPlane::intersect (const SbPlane &pl, SbLine &line) const
       Intersect this plane with pl, and return the resulting line in line. Returns TRUE if an
       intersection line can be found, and FALSE if the planes are parallel.

       Please note that the resulting SbLine must be considered as a line intersecting the
       SbLine's origin, extending infinitely in both directions.

       This function is an extension for Coin, and it is not available in the original SGI Open
       Inventor v2.1 API.

       Since:
           Coin 2.0

Friends And Related Function Documentation

   int operator== (const SbPlane &p1, const SbPlane &p2) [friend]
       Check the two given planes for equality.

   int operator!= (const SbPlane &p1, const SbPlane &p2) [friend]
       Check the two given planes for unequality.

Author

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