DD::Image::Vector4 Class Reference

List of all members.

Public Member Functions
float &	operator[] (int i)
const float &	operator[] (int i) const
const float *	array () const
	Vector4 ()
	Vector4 (const float v[4])
	Vector4 (const double v[4])
	Vector4 (float a, float b, float c=0, float d=1)
void	set (float a, float b, float c=0, float d=1)
	Vector4 (const Vector3 &v, float d=1)
void	set (const Vector3 &v, float d=1)
Vector3	divide_w () const
Vector3	truncate_w () const
Vector4	operator* (float d) const
Vector4 &	operator*= (float d)
Vector4	operator/ (float d) const
Vector4 &	operator/= (float d)
Vector4	operator* (const Vector4 &v) const
Vector4 &	operator*= (const Vector4 &v)
Vector4	operator/ (const Vector4 &v) const
Vector4 &	operator/= (const Vector4 &v)
Vector4	operator+ (const Vector4 &v) const
Vector4 &	operator+= (const Vector4 &v)
Vector4	operator- () const
Vector4	operator- (const Vector4 &v) const
Vector4 &	operator-= (const Vector4 &v)
bool	operator== (const Vector4 &v) const
bool	operator!= (const Vector4 &v) const
bool	operator== (float d) const
bool	operator!= (float d) const
bool	operator< (const Vector4 &v) const
	Fairly arbitrary operator so you can store these in ordered arrays.
void	append (Hash &) const
Public Attributes
float	x
float	y
float	z
float	w
Friends
std::ostream &	operator<< (std::ostream &o, const Vector4 &)

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Detailed Description

4-component vector. This is used to represent a point in 3D homogenous (perspective) space, and is also useful to represent an rgb color with alpha.

This object is NOT compatible with the SbVec4 template in the Inventor library. Several of the operators ignore the w and treat this as a Vector3. This was done as it made use of this in the 3D system much easier.

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Constructor & Destructor Documentation

DD::Image::Vector4::Vector4

(

)

[inline]

The default constructor leaves garbage in x,y,z,w!

DD::Image::Vector4::Vector4

(

const float

v[4]

)

[inline]

Constructor from an array of numbers.

DD::Image::Vector4::Vector4

(

const double

v[4]

)

[inline]

Constructor from an array of numbers.

DD::Image::Vector4::Vector4	(	float	a,
		float	b,
		float	c = 0,
		float	d = 1
	)		[inline]

Constructor that sets all 4 numbers

DD::Image::Vector4::Vector4	(	const Vector3 &	v,
		float	d = 1
	)		[inline]

Conversion from a Vector3

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Member Function Documentation

float& DD::Image::Vector4::operator[]

(

int

i

)

[inline]

vector[0] is x, vector[1] is y, vector[2] is z, vector[3] is w.

const float& DD::Image::Vector4::operator[]

(

int

i

)

const [inline]

vector[0] is x, vector[1] is y, vector[2] is z, vector[3] is w.

const float* DD::Image::Vector4::array

(

)

const [inline]

Returns a ponter that can be passed to OpenGL

Referenced by DD::Image::ParticlesSprite::draw_quad(), DD::Image::LightOp::shade_GL(), and DD::Image::ComplexLightOp::shade_GL().

void DD::Image::Vector4::set	(	float	a,
		float	b,
		float	c = 0,
		float	d = 1
	)		[inline]

Change all of xyzw.

Referenced by DD::Image::Mesh::create_point_uvs(), DD::Image::Material::engine(), DD::Image::LightOp::shade_GL(), DD::Image::ComplexLightOp::shade_GL(), and DD::Image::ParticlesSprite::tessellateSprite().

void DD::Image::Vector4::set	(	const Vector3 &	v,
		float	d = 1
	)		[inline]

Conversion from a Vector3

Vector3 DD::Image::Vector4::divide_w

(

)

const [inline]

Divides xyz by w and returns that

Referenced by DD::Image::CameraOp::draw_handle(), and DD::Image::ViewerContext::zoom().

Vector3 DD::Image::Vector4::truncate_w

(

)

const [inline]

Just ignores the w. This is correct for a distance where w==0.

Vector4 DD::Image::Vector4::operator*

(

float

d

)

const [inline]

Multiplies all 4 numbers. This will multiply a distance. However if w is non-zero, the resulting 3D point will not move, because x/w will not change.

Vector4 DD::Image::Vector4::operator/

(

float

d

)

const [inline]

Divides all 4 numbers.

Vector4 DD::Image::Vector4::operator*

(

const Vector4 &

v

)

const [inline]

Component-wise multiplication, useful for colors.

Vector4 DD::Image::Vector4::operator/

(

const Vector4 &

v

)

const [inline]

Component-wise division, useful for colors.

Vector4 DD::Image::Vector4::operator+

(

const Vector4 &

v

)

const [inline]

Component-wise addition.

Vector4 DD::Image::Vector4::operator-

(

)

const [inline]

Component-wise subtraction.

void Vector4::append

(

Hash &

hash

)

const

Add this to the Hash object.

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Friends And Related Function Documentation

std::ostream& operator<<	(	std::ostream &	o,
		const Vector4 &
	)		[friend]

Writes it in nuke/tcl notation, with nested curly braces