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SbPlane Class Reference
[Base classes]

The SbPlane class represents a plane in 3D space. More...

#include <Inventor/SbLinear.h>

List of all members.

Public Methods

 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 SbVec3fgetNormal (void) const
float getDistanceFromOrigin (void) const
void print (FILE *file) const
SbBool intersect (const SbPlane &pl, SbLine &line)

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   normal,
const float    D
 

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 when using this constructor.

SbPlane::SbPlane const SbVec3f   normal,
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 float    d
 

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
 

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.

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.


The documentation for this class was generated from the following files:
Generated on Sat May 24 22:39:42 2003 for Coin by doxygen1.2.18