# Unigine::Math::vec4 Struct

This class represents a vector of 4 float components.

## vec4 ( const __m128& v ) #

Constructor. Initializes the vector using a given 128-bit variable as a source.
Notice
We do not recommend to use this method unless you have a clear understanding of SSE2.

### Arguments

• const __m128& v - 128-bit variable

## vec4 ( const quat& q ) #

Constructor. Initializes the vector using a given source quaternion.

### Arguments

• const quat& q

## vec4 ( const hvec4& v ) #

Constructor. Initializes the vector using a given hvec4 source vector.

### Arguments

• const hvec4& v - Source vector.

## vec4 ( ) #

Default constructor. Produces a zero vector.

## vec4 ( const vec4& v ) #

Constructor. Initializes the vector by copying a given source vector.

### Arguments

• const vec4& v - Source vector.

## vec4 ( const vec2& v, float z, float w ) #

Constructor. Initializes the vector using a given two-component vec2 source vector and two scalars.

### Arguments

• const vec2& v - Two-component source vector.
• float z - Z component of the vector.
• float w - W component of the vector.

## vec4 ( const vec3& v, float w ) #

Constructor. Initializes the vector using a given three-component vec3 source vector and a scalar.

### Arguments

• const vec3& v - Three-component source vector.
• float w - W component of the vector.

## vec4 ( float x, float y, float z, float w ) #

Constructor. Initializes the vector using given float values.

### Arguments

• float x - X component of the vector.
• float y - Y component of the vector.
• float z - Z component of the vector.
• float w - W component of the vector.

## explicit vec4 ( float v ) #

Constructor. Initializes the vector using a given scalar value: x=v, y=v, z=v, w=v.

### Arguments

• float v - Scalar value.

## explicit vec4 ( const vec2& v ) #

Constructor. Initializes the vector using a given two-component vec2 source vector: x=v.x, y=v.y, z=0.0f, w=1.0f.

### Arguments

• const vec2& v - Two-component source vector.

## explicit vec4 ( const vec3& v ) #

Constructor. Initializes the vector using a given three-component vec3 source vector: x=v.x, y=v.y, z=v.z, w=1.0f.

### Arguments

• const vec3& v - Three-component source vector.

## explicit vec4 ( const dvec4& v ) #

Constructor. Initializes the vector using a given dvec4 source vector.

### Arguments

• const dvec4& v - Source vector.

## explicit vec4 ( const ivec4& v ) #

Constructor. Initializes the vector using a given ivec4 source vector.

### Arguments

• const ivec4& v - Source vector.

## explicit vec4 ( const bvec4& v ) #

Constructor. Initializes the vector using a given bvec4 source vector.

### Arguments

• const bvec4& v - Source vector.

## explicit vec4 ( const svec4& v ) #

Constructor. Initializes the vector using a given svec4 source vector.

### Arguments

• const svec4& v - Source vector.

## explicit vec4 ( const float* v ) #

Constructor. Initializes the vector using a given pointer to the array of float elements: x=v[0], y=v[1], z=v[2], w=v[3].

### Arguments

• const float* v - Pointer to the array of float elements.

## vec4 ( const dvec2& v0, const dvec2& v1 ) #

Constructor. Initializes the vector using given two dvec2 source vectors.

### Arguments

• const dvec2& v0 - Two-component source vector.
• const dvec2& v1 - Two-component source vector.

## vec4 ( const vec2& v0, const vec2& v1 ) #

Constructor. Initializes the vector using given two vec2 source vectors.

### Arguments

• const vec2& v0 - Two-component source vector.
• const vec2& v1 - Two-component source vector.

## vec4 ( float x, float y, float z, float w, ConstexprTag ) #

Constructor. Initializes the vector using given float values.

### Arguments

• float x - X component of the vector.
• float y - Y component of the vector.
• float z - Z component of the vector.
• float w - W component of the vector.
• ConstexprTag - Auxiliary tag.

## vec4 ( float v, ConstexprTag ) #

Constructor. Initializes the vector using a given constant scalar value: x=v, y=v, z=v, w=v.

### Arguments

• float v - Constant scalar value.
• ConstexprTag - Auxiliary tag.

## vec4 &abs ( ) #

Returns the absolute values of the vector components.

### Return value

Vector with absolute values.

## voidset ( float x_, float y_, float z_, float w_ ) #

Sets the vector by components.

### Arguments

• float x_ - X component of the vector.
• float y_ - Y component of the vector.
• float z_ - Z component of the vector.
• float w_ - W component of the vector.

## voidset ( const float* v ) #

Sets the vector using the array of float elements: x=val[0], y=val[1], z=val[2], w=val[3].

### Arguments

• const float* v - Pointer to the array of float elements.

## voidset ( const vec4& v ) #

Sets the vector equal to the specified source vector.

### Arguments

• const vec4& v - Source vector.

## voidset ( const vec2& v, float z_, float w_ ) #

Sets the vector using a two-component vec2 source vector and two scalars.

### Arguments

• const vec2& v - Two-component source vector.
• float z_ - Z component of the vector.
• float w_ - W component of the vector.

## voidset ( const vec3& v, float w_ ) #

Sets the vector using a three-component vec3 source vector and a scalar.

### Arguments

• const vec3& v - Three-component source vector.
• float w_ - W component of the vector.

## voidset ( const quat& q ) #

Sets the vector using a quaternion.

### Arguments

• const quat& q - Quaternion.

## voidset ( float v ) #

Sets the vector components equal to specified scalar value: x=val, y=val, z=val, w=val.

### Arguments

• float v - Scalar value.

## voidget ( float* v ) const#

Gets the vector: val[0]=x, val[1]=y, val[2]=z, val[3]=w.

### Arguments

• float* v - Pointer to the array of float elements.

## float *get ( ) #

Returns the pointer to the vector.

### Return value

Pointer to the vector.

## const float *get ( ) const#

Returns the constant pointer to the vector.

### Return value

Pointer to the vector.

## floatlength ( ) const#

Returns the length of the vector.

Vector length.

## floatlength2 ( ) const#

Returns the squared length of the vector.

### Return value

Squared length of the vector.

## floatmaxXY ( ) const#

Compares the X and Y components of the vector and returns the greater one.

### Return value

The greater out of the X and Y components of the vector.

## floatmaxXYZ ( ) const#

Compares the X, Y, and Z components of the vector and returns the greatest one.

### Return value

The greatest out of the X, Y, and Z vector components.

## floatmax ( ) const#

Compares all components of the vector and returns the greatest value.

### Return value

The greatest out of the vector components.

## vec4 &normalize ( ) #

Returns normalized vector.

### Return value

Normalized vector.

## vec4 &normalizeValid ( ) #

Normalizes a vector, makes its magnitude equal to 1. When normalized, a vector keeps the same direction but its length is equal to 1. Check for the zero vector is performed: if the argument is a zero vector, then a zero vector is returned.

### Return value

Normalized vector.

## vec4 &normalizeFast ( ) #

Returns normalized vector, calculated using the fast inverse square root algorithm.

### Return value

Normalized vector.

## vec4 &normalizeValidFast ( ) #

Returns normalized vector, calculated using the fast inverse square root algorithm. Check for the zero vector is performed: if the argument is a zero vector, then a zero vector is returned.

### Return value

Normalized vector.

## vec4 &normalize3 ( ) #

Returns the vector with normalized XYZ components.

### Return value

Vector with normalized XYZ components.

## vec4 &normalizeValid3 ( ) #

Returns the vector with normalized XYZ components. Check for the zero vector is performed: if the argument is a zero vector, then a zero vector is returned.

### Return value

Vector with normalized XYZ components.

## vec4 &normalizeFast3 ( ) #

Returns the vector with XYZ components normalized using the fast inverse square root algorithm.

### Return value

Vector with normalized XYZ components.

## vec4 &normalizeValidFast3 ( ) #

Returns the vector with XYZ components normalized using the fast inverse square root algorithm. Check for the zero vector is performed: if the argument is a zero vector, then a zero vector is returned.

### Return value

Vector with normalized XYZ components.

## const float *operator const float * ( ) const#

Performs type conversion to const float *.

## const void *operator const void * ( ) const#

Performs type conversion to const void *.

## float *operator float * ( ) #

Performs type conversion to float *.

## void *operator void * ( ) #

Performs type conversion to void *.

## vec4 &operator*= ( float v ) #

Performs scalar multiplication.

### Arguments

• float v - Scalar value.

### Return value

Resulting vector.

## vec4 &operator*= ( const vec4& v ) #

Performs vector multiplication.

### Arguments

• const vec4& v - Vector.

### Return value

Resulting vector.

## vec4 &operator+= ( const vec4& v ) #

### Arguments

• const vec4& v - Vector.

### Return value

Resulting vector.

## vec4operator- ( ) const#

Performs vector negation.

### Return value

Resulting vector.

## vec4 &operator-= ( const vec4& v ) #

Performs vector subtraction.

### Arguments

• const vec4& v - Vector.

### Return value

Resulting vector.

## vec4 &operator/= ( float v ) #

Performs componentwise division of the vector by the scalar. Implemented using the calculation of inverse scalar value with subsequent by-component multiplication.

### Arguments

• float v - Scalar value.

### Return value

Resulting vector.

### Examples

Source code (UnigineScript)
``````vec4 a = vec4(6.0, 10.0, 12.0, 25.0);
a /= 2.0;
/*
Initial value of vector a:
a (6.0, 10.0, 12.0, 25.0)

a /= 2.0;
Vector a after operation:
a (3.0, 5.0, 6.0, 12.5)
*/``````

## vec4 &operator/= ( const vec4& v ) #

Performs componentwise division of vectors.

### Arguments

• const vec4& v - Vector.

### Return value

Resulting vector.

### Examples

Source code (UnigineScript)
``````vec4 a, b;
a = vec4(6.0, 10.0, 12.0, 25.0);
b = vec4(2.0, 5.0, 6.0, 5.0);
a /= b;
/*
Initial values of vectors a and b:
a (6.0, 10.0, 12.0, 25.0)
b (2.0, 5.0, 6.0, 5.0)

a /= b;
Vector a after operation:
a (3.0, 2.0, 2.0, 5.0)
*/``````

## vec4 &operator= ( const __m128& v ) #

Sets the vector using a given 128-bit variable as a source.
Notice
We do not recommend to use this method unless you have a clear understanding of SSE2.

### Arguments

• const __m128& v - 128-bit variable.

Vector.

## vec4 &operator= ( const vec4& v ) #

Performs vector assignment. Destination vector = Source vector.

### Arguments

• const vec4& v - Source vector.

Result.

## float &operator[] ( int i ) #

Performs array access to the vector item reference by using given item index.

### Arguments

• int i - Vector item index.

### Return value

Vector item reference.

## floatoperator[] ( int i ) const#

Performs array access to the vector item by using given item index.

### Arguments

• int i - Vector item index.

Vector item.

## voidmul ( float v ) #

Multiplies the vector by the value of the specified argument.

### Arguments

• float v - A float multiplier.

## voidmul ( const vec4& v ) #

Multiplies the vector by the value of the specified argument.

### Arguments

• const vec4& v - Vector multiplier.

## voidmul3 ( float v ) #

Multiplies the X, Y, and Z components of the vector by the value of the specified argument.

### Arguments

• float v - A float multiplier.

## voiddiv ( float v ) #

Returns the result of division of the vector by the value of the specified arguments.

### Arguments

• float v - A float divisor value.

## voiddiv ( const vec4& v ) #

Returns the result of division of the vector by the value of the specified arguments.

### Arguments

• const vec4& v - A vec3 divisor value.

## floatsum ( ) const#

Returns the sum of vector components.

## voidadd ( float v ) #

Performs addition of the specified argument.

### Arguments

• float v - Value.

## voidadd ( const vec4& v ) #

Performs addition of the specified argument.

### Arguments

• const vec4& v - Value.

## vec4 &operator+= ( float v ) #

Performs addition of the specified value.

### Arguments

• float v - Value.

This vector.

## voidsub ( float v ) #

Subtracts the argument from all elements of the vector.

### Arguments

• float v - Value.

## voidsub ( const vec4& v ) #

Subtracts each element of the specified argument from ther corresponding element.

### Arguments

• const vec4& v - Value.

## vec4 &operator-= ( float v ) #

Subtracts the argument from all elements of the vector.

### Arguments

• float v - Value.

This vector.

## vec4 &operator= ( const float v ) #

Sets the vector components equal to specified scalar value: x=val, y=val, z=val, w=val.

### Arguments

• const float v - Scalar value.

This vector.

## floatlengthFast ( ) const#

Returns the length of the vector (fast version).

## floatiLength ( ) const#

Returns the inverted length of the vector.

## floatiLengthFast ( ) const#

Returns the inverted length of the vector (fast version).

## static vec4parseColor ( const char * str ) #

Converts a color string in the Web format (RRGGBB / #RRGGBB or RRGGBBAA / #RRGGBBAA) into its vec4 equivalent.

### Arguments

• const char * str - Color string in the Web format.

### Return value

Color value as a vec4 vector (R, G, B, A).

## unsigned inthash ( ) const#

Last update: 20.04.2022