SbVec3f(3)

NAME
SbVec3f - The SbVec3f class is a 3 dimensional vector with floating point coordinates.

This vector class is used by many other classes in Coin. It provides storage for a 3 dimensional vector aswell as simple floating point arithmetic operations.

SYNOPSIS

#include <Inventor/SbLinear.h>

Inherited by SbColor.

  Public Member Functions
SbVec3f (void)
SbVec3f (const float v[3])
SbVec3f (float x, float y, float z)
SbVec3f (const SbVec3d &v)
SbVec3f (const SbVec3b &v)
SbVec3f (const SbVec3s &v)
SbVec3f (const SbVec3i32 &v)
SbVec3f (const SbPlane &p0, const SbPlane &p1, const SbPlane &p2)
SbVec3f & setValue (const float v[3])
SbVec3f & setValue (float x, float y, float z)
SbVec3f & setValue (const SbVec3f &barycentric, const SbVec3f &v0, const SbVec3f &v1, const SbVec3f &v2)
SbVec3f & setValue (const SbVec3d &v)
SbVec3f & setValue (const SbVec3b &v)
SbVec3f & setValue (const SbVec3s &v)
SbVec3f & setValue (const SbVec3i32 &v)
const float * getValue (void) const
void getValue (float &x, float &y, float &z) const
float & operator[] (int i)
const float & operator[] (int i) const
SbBool equals (const SbVec3f &v, float tolerance) const
SbVec3f cross (const SbVec3f &v) const
float dot (const SbVec3f &v) const
SbVec3f getClosestAxis (void) const
float length (void) const
float sqrLength (void) const
float normalize (void)
void negate (void)
SbVec3f & operator*= (float d)
SbVec3f & operator/= (float d)
SbVec3f & operator+= (const SbVec3f &v)
SbVec3f & operator-= (const SbVec3f &v)
SbVec3f operator- (void) const
void print (FILE *fp) const

  Protected Attributes
float vec [3]

  Related Functions
(Note that these are not member functions.)
SbVec3f operator* (const SbVec3f &v, float d)
SbVec3f operator* (float d, const SbVec3f &v)
SbVec3f operator/ (const SbVec3f &v, float d)
SbVec3f operator+ (const SbVec3f &v1, const SbVec3f &v2)
SbVec3f operator- (const SbVec3f &v1, const SbVec3f &v2)
int operator== (const SbVec3f &v1, const SbVec3f &v2)
int operator!= (const SbVec3f &v1, const SbVec3f &v2)

Detailed Description

The SbVec3f class is a 3 dimensional vector with floating point coordinates.

This vector class is used by many other classes in Coin. It provides storage for a 3 dimensional vector aswell as simple floating point arithmetic operations.

See also:
    SbVec2s, SbVec2f, SbVec2d, SbVec3s, SbVec3d, SbVec4f, SbVec4d.

Constructor & Destructor Documentation

  SbVec3f::SbVec3f (void) [inline]
The default constructor does nothing. The vector coordinates will be uninitialized until you do a setValue() call.

  SbVec3f::SbVec3f (const float v[3]) [inline]
Constructs an SbVec3f instance with initial values from v.

  SbVec3f::SbVec3f (float x, float y, float z) [inline]
Constructs an SbVec3f instance with the initial vector endpoint set to <x,y,z>.

  SbVec3f::SbVec3f (const SbVec3d & v) [inline], [explicit]
Constructs an SbVec3f instance from an SbVec3d instance.

  SbVec3f::SbVec3f (const SbVec3b & v) [inline], [explicit]
Constructs an SbVec3f instance from an SbVec3b instance.

Since:
    Coin 2.5

  SbVec3f::SbVec3f (const SbVec3s & v) [inline], [explicit]
Constructs an SbVec3f instance from an SbVec3s instance.

Since:
    Coin 2.5

  SbVec3f::SbVec3f (const SbVec3i32 & v) [inline], [explicit]
Constructs an SbVec3f instance from an SbVec3i32 instance.

Since:
    Coin 2.5

  SbVec3f::SbVec3f (const SbPlane & p0, const SbPlane & p1, const SbPlane & p2)
Constructs an SbVec3f instance by combining the three given planes. None of the planes should be parallel to any of the other two, otherwise a divide by zero error will occur.

Member Function Documentation

  SbVec3f & SbVec3f::setValue (const float v[3]) [inline]
Set new coordinates for the vector from v. Returns reference to self.

See also:
    getValue().

  SbVec3f & SbVec3f::setValue (float x, float y, float z) [inline]
Set new coordinates for the vector. Returns reference to self.

See also:
    getValue().

  SbVec3f & SbVec3f::setValue (const SbVec3f & barycentric, const SbVec3f & v0, const SbVec3f & v1, const SbVec3f & v2)
Set this vector to be the average of v0, v1 and v2. The vector components are weighted by the barycentric vector.

See also:
    getValue().

  SbVec3f & SbVec3f::setValue (const SbVec3d & v)
Sets this vector to the double precision vector v, converting the vector to a single precision vector.

This is a Coin extension.

Since:
    Coin 2.0

  SbVec3f & SbVec3f::setValue (const SbVec3b & v)

Since:
    Coin 2.5

See also:
    getValue()

  SbVec3f & SbVec3f::setValue (const SbVec3s & v)

Since:
    Coin 2.5

See also:
    getValue()

  SbVec3f & SbVec3f::setValue (const SbVec3i32 & v)

Since:
    Coin 2.5

See also:
    getValue()

  const float * SbVec3f::getValue (void) const [inline]
Returns a pointer to an array of three floats containing the x, y and z coordinates of the vector.

See also:
    setValue().

  void SbVec3f::getValue (float & x, float & y, float & z) const [inline]
Returns the x, y and z coordinates of the vector.

See also:
    setValue().

  float & SbVec3f::operator[] (int i) [inline]
Index operator. Returns modifiable x, y or z coordinate of vector.

See also:
    getValue() and setValue().

  float SbVec3f::operator[] (int i) const [inline]
Index operator. Returns x, y or z coordinate of vector.

See also:
    getValue() and setValue().

  SbBool SbVec3f::equals (const SbVec3f & v, float 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.

  SbVec3f SbVec3f::cross (const SbVec3f & v) const
Returns the result of taking the cross product of this vector and v.

  float SbVec3f::dot (const SbVec3f & v) const [inline]
Calculates and returns the result of taking the dot product of this vector and v.

  SbVec3f SbVec3f::getClosestAxis (void) const
Return the vector representing the principal axis closest to this vector.

  float SbVec3f::length (void) const
Return length of vector.

  float SbVec3f::sqrLength (void) const [inline]
Returns the squared length of the vector.

  float SbVec3f::normalize (void)
Normalize the vector to unit length. Return value is the original length of the vector before normalization.

If the vector is the null vector, no attempt at normalization will be done. If the Coin library was built in a debug version, and the COIN_DEBUG_NORMALIZE environment variable is set, this error message will then be shown:

  Coin warning in SbVec3f::normalize(): The length of the vector
  should be > 0.0f to be able to normalize.

We've made it possible for Coin to spit out a warning when an attempt at normalizing a null-vector is made, as that seems to sometimes be a symptom caused by some graver error somewhere else -- either an internal error in Coin code, a programming error in application code, or an error in an input file (like for instance invalid polygon specifications).

If you run into bugs/problems with your application or with Coin, it could be a good idea to set COIN_DEBUG_NORMALIZE=1, and then restart the application to see if you get any warnings from normalize().

If this happens, you should run the application in a debugger and see how the call-stack backtrace looks when it hits. An easy way of getting a debugger break at the warning spot is to set the following debugging environment variable which will make the code assert:

  COIN_DEBUG_BREAK="SbVec3f::normalize"

If you from the backtrace analysis strongly suspects an internal Coin bug, please report the call-stack to us at coin-support@coin3d.org and we'll look into it. Example code that triggers the bug would then also be very helpful.

A note for developers porting code from SGI or TGS Inventor to Coin: those Inventor implementations are more slack about detecting and giving out warning messages upon API misuses, and you may suddenly have gotten this warning with Coin without seeing any indication of an error with SGI/TGS Inventor. This does not necessarily mean that it is a bug in Coin -- it is much more likely that you are getting a warning as an indication of API misuse or import file errors which were just not detected and/or reported with those Inventor implementations.

  void SbVec3f::negate (void) [inline]
Negate the vector (i.e. point it in the opposite direction).

  SbVec3f & SbVec3f::operator*= (float d) [inline]
Multiply components of vector with scalar value d. Returns reference to self.

  SbVec3f & SbVec3f::operator/= (float d) [inline]
Divides components of vector with scalar value d. Returns reference to self.

  SbVec3f & SbVec3f::operator+= (const SbVec3f & u) [inline]
Adds this vector and vector u. Returns reference to self.

  SbVec3f & SbVec3f::operator-= (const SbVec3f & u) [inline]
Subtracts vector u from this vector. Returns reference to self.

  SbVec3f SbVec3f::operator- (void) const [inline]
Non-destructive negation operator. Returns a new SbVec3f instance which points in the opposite direction of this vector.

See also:
    negate().

  void SbVec3f::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 compile.

Friends And Related Function Documentation

  SbVec3f operator* (const SbVec3f & v, float d) [related]
Returns an SbVec3f instance which is the components of vector v multiplied with d.

  SbVec3f operator* (float d, const SbVec3f & v) [related]
Returns an SbVec3f instance which is the components of vector v multiplied with d.

  SbVec3f operator/ (const SbVec3f & v, float d) [related]
Returns an SbVec3f instance which is the components of vector v divided on the scalar factor d.

  SbVec3f operator+ (const SbVec3f & v1, const SbVec3f & v2) [related]
Returns an SbVec3f instance which is the sum of vectors v1 and v2.

  SbVec3f operator- (const SbVec3f & v1, const SbVec3f & v2) [related]
Returns an SbVec3f instance which is vector v2 subtracted from vector v1.

  int operator== (const SbVec3f & v1, const SbVec3f & v2) [related]
Returns 1 if v1 and v2 are exactly equal, 0 otherwise.

See also:
    equals().

  int operator!= (const SbVec3f & v1, const SbVec3f & v2) [related]
Returns 1 if v1 and v2 are not equal, 0 if they are equal.

See also:
    equals().

Author

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