# SbDPPlane.3coin4 - Man Page

The SbDPPlane class represents a plane in 3D space.

## Synopsis

`#include <Inventor/SbLinear.h>`

### Public Member Functions

**SbDPPlane** (void)**SbDPPlane** (const **SbVec3d** &normal, const double D)**SbDPPlane** (const **SbVec3d** &p0, const **SbVec3d** &p1, const **SbVec3d** &p2)**SbDPPlane** (const **SbVec3d** &normal, const **SbVec3d** &point)

void **offset** (const double d)

SbBool **intersect** (const **SbDPLine** &l, **SbVec3d** &intersection) const

void **transform** (const **SbDPMatrix** &matrix)

SbBool **isInHalfSpace** (const **SbVec3d** &point) const

double **getDistance** (const **SbVec3d** &point) const

const **SbVec3d** & **getNormal** (void) const

double **getDistanceFromOrigin** (void) const

void **print** (FILE *file) const

SbBool **intersect** (const **SbDPPlane** &pl, **SbDPLine** &line) const

## Detailed Description

The **SbDPPlane** class represents a plane in 3D space.

**SbDPPlane** 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.

Be aware that this class is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

**Since**Coin 2.0

## Constructor & Destructor Documentation

### SbDPPlane::SbDPPlane (void )

An **SbDPPlane** instantiated with the default constructor will be uninitialized.

### SbDPPlane::SbDPPlane (const SbVec3d & normalref, const double D)

Construct an **SbDPPlane** 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.

### SbDPPlane::SbDPPlane (const SbVec3d & p0, const SbVec3d & p1, const SbVec3d & p2)

Construct an **SbDPPlane** with three points laying in the plane. Make sure *p0*, *p1* and *p2* are actually three distinct points when using this constructor.

### SbDPPlane::SbDPPlane (const SbVec3d & normalref, const SbVec3d & point)

Construct an **SbDPPlane** from a normal and a point laying in the plane.

*normal* must not be a null vector.

## Member Function Documentation

### void SbDPPlane::offset (const double d)

Add the given offset *d* to the plane distance from the origin.

### SbBool SbDPPlane::intersect (const SbDPLine & l, SbVec3d & 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 SbDPPlane::transform (const SbDPMatrix & matrix)

Transform the plane by *matrix*.

**See also****offset()**

### SbBool SbDPPlane::isInHalfSpace (const SbVec3d & point) const

Check if the given point lies in the halfspace of the plane which the plane normal vector is pointing.

### double SbDPPlane::getDistance (const SbVec3d & point) const

Return the distance from *point* to plane. Positive distance means the point is in the plane's halfspace.

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

### const SbVec3d & SbDPPlane::getNormal (void ) const

Return the plane's normal vector, which indicates which direction the plane is oriented.

**See also****getDistanceFromOrigin()**.

### double SbDPPlane::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 SbDPPlane::print (FILE * fp) const

Dump the state of this object to the *fp* file stream. Only works in debug version of library, method does nothing in an optimized build.

### SbBool SbDPPlane::intersect (const SbDPPlane & pl, SbDPLine & 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.

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

## Author

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