GLM_EXT_matrix_transform

Functions
template<typename genType >
GLM_FUNC_DECL GLM_CONSTEXPR genType	identity ()
template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q >	lookAt (vec< 3, T, Q > const &eye, vec< 3, T, Q > const &center, vec< 3, T, Q > const &up)
template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q >	lookAtLH (vec< 3, T, Q > const &eye, vec< 3, T, Q > const &center, vec< 3, T, Q > const &up)
template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q >	lookAtRH (vec< 3, T, Q > const &eye, vec< 3, T, Q > const &center, vec< 3, T, Q > const &up)
template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q >	rotate (mat< 4, 4, T, Q > const &m, T angle, vec< 3, T, Q > const &axis)
template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q >	scale (mat< 4, 4, T, Q > const &m, vec< 3, T, Q > const &v)
template<typename T , qualifier Q>
GLM_FUNC_DECL mat< 4, 4, T, Q >	translate (mat< 4, 4, T, Q > const &m, vec< 3, T, Q > const &v)

Detailed Description

Defines functions that generate common transformation matrices.

The matrices generated by this extension use standard OpenGL fixed-function conventions. For example, the lookAt function generates a transform from world space into the specific eye space that the projective matrix functions (perspective, ortho, etc) are designed to expect. The OpenGL compatibility specifications defines the particular layout of this eye space.

Include <glm/ext/matrix_transform.hpp> to use the features of this extension.

See also

GLM_EXT_matrix_projection

GLM_EXT_matrix_clip_space

Function Documentation

lookAt()

GLM_FUNC_DECL mat<4, 4, T, Q> glm::lookAt	(	vec< 3, T, Q > const &	eye,
		vec< 3, T, Q > const &	center,
		vec< 3, T, Q > const &	up
	)

Build a look at view matrix based on the default handedness.

Parameters

eye	Position of the camera
center	Position where the camera is looking at
up	Normalized up vector, how the camera is oriented. Typically (0, 0, 1)

Template Parameters

T	A floating-point scalar type
Q	A value from qualifier enum

See also

- frustum(T const& left, T const& right, T const& bottom, T const& top, T const& nearVal, T const& farVal) frustum(T const& left, T const& right, T const& bottom, T const& top, T const& nearVal, T const& farVal)

gluLookAt man page

lookAtLH()

GLM_FUNC_DECL mat<4, 4, T, Q> glm::lookAtLH	(	vec< 3, T, Q > const &	eye,
		vec< 3, T, Q > const &	center,
		vec< 3, T, Q > const &	up
	)

Build a left handed look at view matrix.

Parameters

eye	Position of the camera
center	Position where the camera is looking at
up	Normalized up vector, how the camera is oriented. Typically (0, 0, 1)

Template Parameters

T	A floating-point scalar type
Q	A value from qualifier enum

See also

- frustum(T const& left, T const& right, T const& bottom, T const& top, T const& nearVal, T const& farVal) frustum(T const& left, T const& right, T const& bottom, T const& top, T const& nearVal, T const& farVal)

lookAtRH()

GLM_FUNC_DECL mat<4, 4, T, Q> glm::lookAtRH	(	vec< 3, T, Q > const &	eye,
		vec< 3, T, Q > const &	center,
		vec< 3, T, Q > const &	up
	)

Build a right handed look at view matrix.

Parameters

eye	Position of the camera
center	Position where the camera is looking at
up	Normalized up vector, how the camera is oriented. Typically (0, 0, 1)

Template Parameters

T	A floating-point scalar type
Q	A value from qualifier enum

See also

- frustum(T const& left, T const& right, T const& bottom, T const& top, T const& nearVal, T const& farVal) frustum(T const& left, T const& right, T const& bottom, T const& top, T const& nearVal, T const& farVal)

rotate()

GLM_FUNC_DECL mat<4, 4, T, Q> glm::rotate	(	mat< 4, 4, T, Q > const &	m,
		T	angle,
		vec< 3, T, Q > const &	axis
	)

Builds a rotation 4 * 4 matrix created from an axis vector and an angle.

Parameters

m	Input matrix multiplied by this rotation matrix.
angle	Rotation angle expressed in radians.
axis	Rotation axis, recommended to be normalized.

Template Parameters

T	A floating-point scalar type
Q	A value from qualifier enum

See also

- rotate(mat<4, 4, T, Q> const& m, T angle, T x, T y, T z)

- rotate(T angle, vec<3, T, Q> const& v)

glRotate man page

scale()

GLM_FUNC_DECL mat<4, 4, T, Q> glm::scale	(	mat< 4, 4, T, Q > const &	m,
		vec< 3, T, Q > const &	v
	)

Builds a scale 4 * 4 matrix created from 3 scalars.

Parameters

m	Input matrix multiplied by this scale matrix.
v	Ratio of scaling for each axis.

Template Parameters

T	A floating-point scalar type
Q	A value from qualifier enum

See also

- scale(mat<4, 4, T, Q> const& m, T x, T y, T z)

- scale(vec<3, T, Q> const& v)

glScale man page

translate()

GLM_FUNC_DECL mat<4, 4, T, Q> glm::translate	(	mat< 4, 4, T, Q > const &	m,
		vec< 3, T, Q > const &	v
	)

Builds a translation 4 * 4 matrix created from a vector of 3 components.

Parameters

m	Input matrix multiplied by this translation matrix.
v	Coordinates of a translation vector.

Template Parameters

T	A floating-point scalar type
Q	A value from qualifier enum

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
...
glm::mat4 m = glm::translate(glm::mat4(1.0f), glm::vec3(1.0f));
// m[0][0] == 1.0f, m[0][1] == 0.0f, m[0][2] == 0.0f, m[0][3] == 0.0f
// m[1][0] == 0.0f, m[1][1] == 1.0f, m[1][2] == 0.0f, m[1][3] == 0.0f
// m[2][0] == 0.0f, m[2][1] == 0.0f, m[2][2] == 1.0f, m[2][3] == 0.0f
// m[3][0] == 1.0f, m[3][1] == 1.0f, m[3][2] == 1.0f, m[3][3] == 1.0f

See also

- translate(mat<4, 4, T, Q> const& m, T x, T y, T z)

- translate(vec<3, T, Q> const& v)

glTranslate man page