# 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 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, y=v, z=v, w=v.

### Arguments

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

## 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 * val ) #

Sets the vector using the array of float elements: x=val, y=val, z=val, w=val.

### Arguments

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

## voidset ( const vec4 & val ) #

Sets the vector equal to the specified source vector.

### Arguments

• const vec4 & val - Source vector.

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

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

### Arguments

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

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

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

### Arguments

• const vec3 & val - 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 val ) #

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

### Arguments

• float val - Scalar value.

## voidget ( float * val ) const#

Gets the vector: val=x, val=y, val=z, val=w.

### Arguments

• float * val - 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 ( ) #

Returns the length of the vector.

Vector length.

## floatlength2 ( ) #

Returns the squared length of the vector.

### Return value

Squared length of the vector.

## floatmaxXY ( ) #

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 ( ) #

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 ( ) #

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.

## __m128operator __m128 ( ) #

Performs type conversion to __m128.
Notice
We do not recommend to use this method unless you have a clear understanding of SSE2.

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

Performs type conversion to const float *.

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

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 val ) #

Performs scalar multiplication.

### Arguments

• float val - Scalar value.

### Return value

Resulting vector.

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

Performs vector multiplication.

### Arguments

• const vec4 & val - Vector.

### Return value

Resulting vector.

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

### Arguments

• const vec4 & val - Vector.

### Return value

Resulting vector.

## vec4operator- ( ) const#

Performs vector negation.

### Return value

Resulting vector.

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

Performs vector subtraction.

### Arguments

• const vec4 & val - Vector.

### Return value

Resulting vector.

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

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

### Arguments

• float val - 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 & val ) #

Performs componentwise division of vectors.

### Arguments

• const vec4 & val - 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 & val ) #

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 & val - 128-bit variable.

Vector.

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

Performs vector assignment. Destination vector = Source vector.

### Arguments

• const vec4 & val - 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.

## __m128sse ( ) #

Returns vector components as a 128-bit variable.
Notice
We do not recommend to use this method unless you have a clear understanding of SSE2.

### Return value

128-bit variable.

## voidsse ( const __m128 & val ) #

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 & val - 128-bit variable.
Last update: 2021-02-17