---
name: "SbVec4d"
section: "3"
platform: "linux"
package: "coin"
version: "1:4.0.10-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/SbVec4d"
---

# SbVec4d(3)

The SbVec4d class is a 4 dimensional vector with double precision floating point coordinates.

## NAME

SbVec4d - The **SbVec4d** class is a 4 dimensional vector with double precision floating point coordinates.

## SYNOPSIS

\#include \<Inventor/SbVec4d.h\>

### Public Member Functions

**SbVec4d** (void)\
 **SbVec4d** (const double v\[4\])\
 **SbVec4d** (double x, double y, double z, double w)\
 **SbVec4d** (const **SbVec4f** &v)\
 **SbVec4d** (const **SbVec4b** &v)\
 **SbVec4d** (const **SbVec4s** &v)\
 **SbVec4d** (const **SbVec4i32** &v)\
 **SbVec4d** & **setValue** (const double v\[4\])\
 **SbVec4d** & **setValue** (double x, double y, double z, double w)\
 **SbVec4d** & **setValue** (const **SbVec4f** &v)\
 **SbVec4d** & **setValue** (const **SbVec4b** &v)\
 **SbVec4d** & **setValue** (const **SbVec4s** &v)\
 **SbVec4d** & **setValue** (const **SbVec4i32** &v)\
 const double \* **getValue** (void) const\
 void **getValue** (double &x, double &y, double &z, double &w) const\
 double & **operator\[\]** (int i)\
 const double & **operator\[\]** (int i) const\
 double **dot** (const **SbVec4d** &v) const\
 SbBool **equals** (const **SbVec4d** &v, double tolerance) const\
 void **getReal** (**SbVec3d** &v) const\
 double **length** (void) const\
 double **sqrLength** (void) const\
 void **negate** (void)\
 double **normalize** (void)\
 **SbVec4d** & **operator\*=** (double d)\
 **SbVec4d** & **operator/=** (double d)\
 **SbVec4d** & **operator+=** (const **SbVec4d** &v)\
 **SbVec4d** & **operator-=** (const **SbVec4d** &v)\
 **SbVec4d** **operator-** (void) const\
 void **print** (FILE \*fp) const\

### Protected Attributes

double **vec** \[4\]\

### Related Symbols

(Note that these are not member symbols.)  **SbVec4d** **operator\*** (const **SbVec4d** &v, double d)\
 **SbVec4d** **operator\*** (double d, const **SbVec4d** &v)\
 **SbVec4d** **operator/** (const **SbVec4d** &v, double d)\
 **SbVec4d** **operator+** (const **SbVec4d** &v1, const **SbVec4d** &v2)\
 **SbVec4d** **operator-** (const **SbVec4d** &v1, const **SbVec4d** &v2)\
 int **operator==** (const **SbVec4d** &v1, const **SbVec4d** &v2)\
 int **operator!=** (const **SbVec4d** &v1, const **SbVec4d** &v2)\

## Detailed Description

The **SbVec4d** class is a 4 dimensional vector with double precision floating point coordinates.

This vector class is not by many other classes in Coin. It provides storage for a 3 dimensional homogeneous vector (with the 4 components usually referred to as \<x, y, z, w\>) as well as simple double precision floating point arithmetic operations.

**See also**

**SbVec2s**, **SbVec2f**, **SbVec2d**, **SbVec3s**, **SbVec3f**, **SbVec3d**, **SbVec4f**.

## Constructor & Destructor Documentation

### SbVec4d::SbVec4d (void ) \[inline\]

The default constructor does nothing. The vector coordinates will be uninitialized until a call the **setValue()**.

### SbVec4d::SbVec4d (const double v\[4\]) \[inline\]

Constructs an **SbVec4d** instance with initial values from *v*.

### SbVec4d::SbVec4d (double x, double y, double z, double w) \[inline\]

Constructs an **SbVec4d** instance with the initial homogeneous vector set to *\<x*,y,z,w\>.

### SbVec4d::SbVec4d (const SbVec4f & v) \[inline\], \[explicit\]

Constructs an **SbVec4d** instance from an **SbVec4f** instance.

### SbVec4d::SbVec4d (const SbVec4b & v) \[inline\], \[explicit\]

Constructs an **SbVec4d** instance from an **SbVec4b** instance.

**Since**

Coin 2.5

### SbVec4d::SbVec4d (const SbVec4s & v) \[inline\], \[explicit\]

Constructs an **SbVec4d** instance from an **SbVec4s** instance.

**Since**

Coin 2.5

### SbVec4d::SbVec4d (const SbVec4i32 & v) \[inline\], \[explicit\]

Constructs an **SbVec4d** instance from an **SbVec4i32** instance.

**Since**

Coin 2.5

## Member Function Documentation

### SbVec4d & SbVec4d::setValue (const double v\[4\]) \[inline\]

Set new coordinates for the vector from *v*. Returns reference to self.

**See also**

**getValue()**.

### SbVec4d & SbVec4d::setValue (double x, double y, double z, double w) \[inline\]

Set new coordinates for the vector. Returns reference to self.

**See also**

**getValue()**.

### SbVec4d & SbVec4d::setValue (const SbVec4f & v)

**Since**

Coin 2.5

### SbVec4d & SbVec4d::setValue (const SbVec4b & v)

**Since**

Coin 2.5

### SbVec4d & SbVec4d::setValue (const SbVec4s & v)

**Since**

Coin 2.5

### SbVec4d & SbVec4d::setValue (const SbVec4i32 & v)

**Since**

Coin 2.5

### const double \* SbVec4d::getValue (void ) const \[inline\]

Returns a pointer to an array of four doubles containing the x, y, z and w coordinates of the vector.

**See also**

**setValue()**.

### void SbVec4d::getValue (double & x, double & y, double & z, double & w) const \[inline\]

Returns the x, y, z and w coordinates of the vector.

**See also**

**setValue()**.

### double & SbVec4d::operator\[\] (int i) \[inline\]

Index operator. Returns modifiable x, y, z or w component of vector.

**See also**

**getValue()** and **setValue()**.

### const double & SbVec4d::operator\[\] (int i) const \[inline\]

Index operator. Returns x, y, z or w component of vector.

**See also**

**getValue()** and **setValue()**.

### double SbVec4d::dot (const SbVec4d & v) const \[inline\]

Calculates and returns the result of taking the dot product of this vector and *v*.

### SbBool SbVec4d::equals (const SbVec4d & v, double tolerance) const

Compares the vector with *v* and returns TRUE if the distance between the vectors is smaller or equal to the square root of *tolerance*.

The comparison is done in 4D-space, i.e. the *w* component of the vector is *not* used to make x, y and z into Cartesian coordinates first.

### void SbVec4d::getReal (SbVec3d & v) const

Returns the vector as a Cartesian 3D vector in *v*. This means that the 3 first components x, y and z will be divided by the fourth, w.

### double SbVec4d::length (void ) const

Return the length of the vector in 4D space.

### double SbVec4d::sqrLength (void ) const \[inline\]

Return the square of the length of the vector in 4D space.

### void SbVec4d::negate (void ) \[inline\]

Negate the vector.

### double SbVec4d::normalize (void )

Normalize the vector to unit length. Return value is the original length of the vector before normalization.

### SbVec4d & SbVec4d::operator\*= (double d) \[inline\]

Multiply components of vector with value *d*. Returns reference to self.

### SbVec4d & SbVec4d::operator/= (double d) \[inline\]

Divides components of vector with value *d*. Returns reference to self.

### SbVec4d & SbVec4d::operator+= (const SbVec4d & v) \[inline\]

Adds this vector and vector *v*. Returns reference to self.

### SbVec4d & SbVec4d::operator-= (const SbVec4d & v) \[inline\]

Subtracts vector *v* from this vector. Returns reference to self.

### SbVec4d SbVec4d::operator- (void ) const \[inline\]

Non-destructive negation operator. Returns a new **SbVec4d** instance which has all components negated.

**See also**

**negate()**.

### void SbVec4d::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.

## Friends And Related Symbol Documentation

### SbVec4d operator\* (const SbVec4d & v, double d) \[related\]

Returns an **SbVec4d** instance which is the components of vector *v* multiplied with *d*.

### SbVec4d operator\* (double d, const SbVec4d & v) \[related\]

Returns an **SbVec4d** instance which is the components of vector *v* multiplied with *d*.

### SbVec4d operator/ (const SbVec4d & v, double d) \[related\]

Returns an **SbVec4d** instance which is the components of vector *v* divided on the scalar factor *d*.

### SbVec4d operator+ (const SbVec4d & v1, const SbVec4d & v2) \[related\]

Returns an **SbVec4d** instance which is the sum of vectors *v1* and *v2*.

### SbVec4d operator- (const SbVec4d & v1, const SbVec4d & v2) \[related\]

Returns an **SbVec4d** instance which is vector *v2* subtracted from vector *v1*.

### int operator== (const SbVec4d & v1, const SbVec4d & v2) \[related\]

Returns *1* if *v1* and *v2* are equal, *0* otherwise.

**See also**

**equals()**.

### int operator!= (const SbVec4d & v1, const SbVec4d & v2) \[related\]

Returns *1* if *v1* and *v2* are not equal, *0* if they are equal.

**See also**

**equals()**.

## Author

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