simple camera class to allow movement in an opengl scene. a lot of this stuff is from the HILL book Computer Graphics with OpenGL 2nd Ed Prentice Hall a very good book fustrum culling modified from http://www.lighthouse3d.com/opengl/viewfrustum/index.php?defvf More...

#include <Camera.h>

Inheritance diagram for ngl::Camera:

Collaboration diagram for ngl::Camera:

Public Member Functions
	Camera () noexcept
	default constructor More...

	Camera (const Vec3 &_eye, const Vec3 &_look, const Vec3 &_up) noexcept
	constructor setting the camera using eye look and up More...

void	roll (Real _angle) noexcept
	roll the cameara around the Z axis More...

void	pitch (Real _angle) noexcept
	roll the cameara around the x axis More...

void	yaw (Real _angle) noexcept
	roll the cameara around the y axis More...

void	slide (Real _du, Real _dv, Real _dn) noexcept
	slide the camera around the U V and N axis More...

void	set (const Vec3 &_eye, const Vec3 &_look, const Vec3 &_up) noexcept
	set the Camera position using eye look and up vectors More...

void	setShape (Real _viewAngle, Real _aspect, Real _near, Real _far) noexcept
	set the shape of the Camera More...

void	setAspect (Real _asp) noexcept
	re-set the aspect ratio of the camera More...

void	setDefaultCamera () noexcept
	sets some nice default camera values More...

void	move (Real _dx, Real _dy, Real _dz) noexcept
	move the camera in world space (i.e. add a translation to each of the axis More...

void	moveBoth (Real _dx, Real _dy, Real _dz) noexcept
	move both the eye and the look at the same time More...

void	moveEye (Real _dx, Real _dy, Real _dz) noexcept
	move the eye position More...

void	moveLook (Real _dx, Real _dy, Real _dz) noexcept
	move the look position More...

void	setViewAngle (Real _angle) noexcept
	set the viewangle for the Camera More...

void	update () noexcept
	Use is called to make this the current camera and set the MODELVIEW and PROJECTION matrices in OpenGL. More...

void	normalisedYaw (Real _angle) noexcept
	used to do a Yaw based on Euler rotation with normalised values More...

void	normalisedPitch (Real _angle) noexcept
	used to do a Pitch based on Euler rotation with normalised values More...

void	normalisedRoll (Real _angle) noexcept
	used to do a Roll based on Euler rotation with normalised values More...

void	writeRib (RibExport &_rib) const noexcept
	write out the Camera so it may be used in Renderman, this writes a transform command in rib format so the OpenGL camera mirrors that of the renderman one More...

const Mat4 &	getViewMatrix () noexcept
	accesor to get the view matrix More...

const Mat4 &	getProjectionMatrix () noexcept
	accesor to get the projection matrix More...

Mat4	getVPMatrix () const noexcept
	get the View * Projection matrix used as part of the MVP calculations More...

Vec4	getEye () const noexcept
	get the eye position More...

void	setEye (Vec4 _e) noexcept
	set the eye position and re-calculate the matrices More...

void	setLook (Vec4 _e) noexcept
	set the look position and re-calculate the matrices More...

Vec4	getLook () const noexcept
	get the look position More...

Vec4	getUp () const noexcept
	get the up vector More...

Vec4	getU () const noexcept
	get the u vector More...

Vec4	getV () const noexcept
	get the v vector More...

Vec4	getN () const noexcept
	get the n vector More...

Real	getFOV () const noexcept
	get the fov value More...

Real	getAspect () const noexcept
	get the aspect value More...

Real	getNear () const noexcept
	get the near clip value More...

Real	getFar () const noexcept
	get the far clip value More...

void	calculateFrustum () noexcept
	calculate the frustum for clipping etc More...

void	drawFrustum () noexcept
	draw the frustum for clipping etc More...

CameraIntercept	isPointInFrustum (const Vec3 &_p) const noexcept
	check to see if the point passed in is within the frustum More...

CameraIntercept	isSphereInFrustum (const Vec3 &_p, Real _radius) const noexcept
	check to see if the sphere passed in is within the frustum More...

CameraIntercept	boxInFrustum (const AABB &b) const noexcept
	check to see if the AABB passed in is within the frustum More...

Protected Types
enum	ProjPlane : char { ProjPlane::TOP = 0, ProjPlane::BOTTOM, ProjPlane::LEFT, ProjPlane::RIGHT, ProjPlane::NEARP, ProjPlane::FARP }
	index values for the planes array More...

Protected Member Functions
void	setPerspProjection () noexcept
	function used to set the perspective projection matrix values More...

void	rotAxes (Vec4 &io_a, Vec4 &io_b, const Real _angle) noexcept
	internal function to calculate the new rotation vectors for the camera after a roll, pitch or yaw More...

void	setViewMatrix () noexcept
	method to set the modelview matrix values for the current camera, this method load the matrix Modelview into OpenGL More...

void	setProjectionMatrix () noexcept
	set the projection matrix More...

Protected Attributes
Vec4	m_u
	vector for the Camera local cord frame More...

Vec4	m_v
	vector for the Camera local cord frame More...

Vec4	m_n
	vector for the Camera local cord frame More...

Vec4	m_eye
	the position of the Camera used to calculate the local cord frame More...

Vec4	m_look
	where the camera is looking to, used with Eye to calculate the Vector m_n More...

Vec4	m_up
	gives a general indication of which way up the camera is More...

Real	m_width
	the width of the display image used for some perspective projection calculations More...

Real	m_height
	the height of the display image used for some perspective projection calculations More...

Real	m_aspect
	used to store the current camera aspect ratio (can be derived from Width / Height More...

Real	m_zNear
	the near clipping plane of the camera view volume More...

Real	m_zFar
	the far clipping plane of the camera view volume More...

Real	m_fov
	the feild of view of the camera view volume, measured from the eye More...

Mat4	m_viewMatrix
	a Matrix to hold the combined modelling and viewing matrix to load into OpenGL More...

Plane	m_planes [6]
	array of planes for fustrum More...

Vec3	m_ntl
	points for the fustrum drawing More...

Vec3	m_ntr

Vec3	m_nbl

Vec3	m_nbr

Vec3	m_ftl

Vec3	m_ftr

Vec3	m_fbl

Vec3	m_fbr

Mat4	m_projectionMatrix
	Projection a Matrix to hold the perspective transfomatio matrix for the camera. More...

Detailed Description

simple camera class to allow movement in an opengl scene. a lot of this stuff is from the HILL book Computer Graphics with OpenGL 2nd Ed Prentice Hall a very good book fustrum culling modified from http://www.lighthouse3d.com/opengl/viewfrustum/index.php?defvf

Author: Jonathan Macey

Version: 5.0

Date: Last Update added fustrum calculation Revision History :
27/08/08 Added experimental projection modes 28/09/09 Updated to NCCA Coding standard

Todo:: Finish off the different projections modes at present persp and ortho work

Definition at line 54 of file Camera.h.

Member Enumeration Documentation

enum ngl::Camera::ProjPlane : char

strongprotected

index values for the planes array

Enumerator
TOP
BOTTOM
LEFT
RIGHT
NEARP
FARP

Definition at line 363 of file Camera.h.

Constructor & Destructor Documentation

ngl::Camera::Camera ( )

noexcept

default constructor

Definition at line 39 of file Camera.cpp.

References m_aspect, m_eye, m_fov, m_height, m_width, m_zFar, m_zNear, and ngl::Vec4::set().

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ngl::Camera::Camera	(	const Vec3 &	_eye,
		const Vec3 &	_look,
		const Vec3 &	_up
	)

noexcept

constructor setting the camera using eye look and up

Parameters

[in]	_eye	the eye position of the Camera
[in]	_look	where the camera is looking
[in]	_up	the notion of upwardness for the camers (get re-calculated from the other vectors)

Definition at line 86 of file Camera.cpp.

References setDefaultCamera().

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Member Function Documentation

CameraIntercept ngl::Camera::boxInFrustum ( const AABB & b ) const

noexcept

check to see if the AABB passed in is within the frustum

Parameters

[in] AABB to test

Returns: the result of the test (inside outside intercept)

Definition at line 479 of file Camera.cpp.

References ngl::Plane::getNormal(), ngl::INSIDE, ngl::INTERSECT, m_planes, and ngl::OUTSIDE.

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void ngl::Camera::calculateFrustum ( )

noexcept

calculate the frustum for clipping etc

Code modified from http://www.lighthouse3d.com/opengl/viewfrustum/index.php?intro

Definition at line 358 of file Camera.cpp.

References BOTTOM, FARP, LEFT, m_aspect, m_eye, m_fbl, m_fbr, m_fov, m_ftl, m_ftr, m_n, m_nbl, m_nbr, m_ntl, m_ntr, m_planes, m_u, m_v, m_zFar, m_zNear, NEARP, ngl::radians(), RIGHT, TOP, and ngl::Vec4::toVec3().

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void ngl::Camera::drawFrustum ( )

noexcept

draw the frustum for clipping etc

Definition at line 387 of file Camera.cpp.

References ngl::VAOFactory::createVAO(), GL_FLOAT, GL_LINES, m_fbl, m_fbr, m_ftl, m_ftr, m_nbl, m_nbr, m_ntl, and m_ntr.

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Real ngl::Camera::getAspect ( ) const

inlinenoexcept

get the aspect value

Returns: the current aspect value

Definition at line 249 of file Camera.h.

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Vec4 ngl::Camera::getEye ( ) const

inlinenoexcept

get the eye position

Returns: the current eye pos

Definition at line 205 of file Camera.h.

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Real ngl::Camera::getFar ( ) const

inlinenoexcept

get the far clip value

Returns: the current far clip value

Definition at line 259 of file Camera.h.

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Real ngl::Camera::getFOV ( ) const

inlinenoexcept

get the fov value

Returns: the current fov value

Definition at line 244 of file Camera.h.

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Vec4 ngl::Camera::getLook ( ) const

inlinenoexcept

get the look position

Returns: the current look pos

Definition at line 219 of file Camera.h.

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Vec4 ngl::Camera::getN ( ) const

inlinenoexcept

get the n vector

Returns: the current n vector

Definition at line 239 of file Camera.h.

Real ngl::Camera::getNear ( ) const

inlinenoexcept

get the near clip value

Returns: the current near clip value

Definition at line 254 of file Camera.h.

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const Mat4& ngl::Camera::getProjectionMatrix ( )

inlinenoexcept

accesor to get the projection matrix

Returns: the current projection matrix

Definition at line 195 of file Camera.h.

Vec4 ngl::Camera::getU ( ) const

inlinenoexcept

get the u vector

Returns: the current u vector

Definition at line 229 of file Camera.h.

Vec4 ngl::Camera::getUp ( ) const

inlinenoexcept

get the up vector

Returns: the current up vector

Definition at line 224 of file Camera.h.

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Vec4 ngl::Camera::getV ( ) const

inlinenoexcept

get the v vector

Returns: the current v vector

Definition at line 234 of file Camera.h.

const Mat4& ngl::Camera::getViewMatrix ( )

inlinenoexcept

accesor to get the view matrix

Returns: the current view matrix

Definition at line 190 of file Camera.h.

Mat4 ngl::Camera::getVPMatrix ( ) const

inlinenoexcept

get the View * Projection matrix used as part of the MVP calculations

Returns: the m_projectionMatrix*m_viewMatrix

Definition at line 200 of file Camera.h.

CameraIntercept ngl::Camera::isPointInFrustum ( const Vec3 & _p ) const

noexcept

check to see if the point passed in is within the frustum

Parameters

_p	the point to check

Returns: the result of the test (inside outside intercept)

Definition at line 441 of file Camera.cpp.

References ngl::INSIDE, m_planes, and ngl::OUTSIDE.

CameraIntercept ngl::Camera::isSphereInFrustum	(	const Vec3 &	_p,
		Real	_radius
	)		const

noexcept

check to see if the sphere passed in is within the frustum

Parameters

[in]	_p	the center of the sphere
[in]	_radius	the radius of the sphere

Returns: the result of the test (inside outside intercept)

Definition at line 457 of file Camera.cpp.

References ngl::Plane::distance(), ngl::INSIDE, ngl::INTERSECT, m_planes, and ngl::OUTSIDE.

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void ngl::Camera::move	(	Real	_dx,
		Real	_dy,
		Real	_dz
	)

noexcept

move the camera in world space (i.e. add a translation to each of the axis

Parameters

[in]	_dx	the translation in the x
[in]	_dy	the translation in the y
[in]	_dz	the translation in the z

Definition at line 181 of file Camera.cpp.

References m_eye, ngl::Vec4::m_x, ngl::Vec4::m_y, ngl::Vec4::m_z, and setViewMatrix().

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void ngl::Camera::moveBoth	(	Real	_dx,
		Real	_dy,
		Real	_dz
	)

noexcept

move both the eye and the look at the same time

Parameters

[in]	_dx	ammount to move in the x
[in]	_dy	ammount to move in the y
[in]	_dz	ammount to move in the z

Definition at line 190 of file Camera.cpp.

References ngl::Vec4::cross(), m_eye, m_look, m_n, m_u, m_up, m_v, ngl::Vec4::m_x, ngl::Vec4::m_y, ngl::Vec4::m_z, ngl::Vec4::normalize(), ngl::Vec4::set(), and setViewMatrix().

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void ngl::Camera::moveEye	(	Real	_dx,
		Real	_dy,
		Real	_dz
	)

noexcept

move the eye position

Parameters

[in]	_dx	ammount to move the eye in the x
[in]	_dy	ammount to move the eye in the y
[in]	_dz	ammount to move the eye in the z

Definition at line 247 of file Camera.cpp.

References ngl::Vec4::cross(), m_eye, m_look, m_n, m_u, m_up, m_v, ngl::Vec4::m_x, ngl::Vec4::m_y, ngl::Vec4::m_z, ngl::Vec4::normalize(), ngl::Vec4::set(), and setViewMatrix().

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void ngl::Camera::moveLook	(	Real	_dx,
		Real	_dy,
		Real	_dz
	)

noexcept

move the look position

Parameters

[in]	_dx	ammount to move the look in the x
[in]	_dy	ammount to move the look in the y
[in]	_dz	ammount to move the look in the z

Definition at line 264 of file Camera.cpp.

References ngl::Vec4::cross(), m_eye, m_look, m_n, m_u, m_up, m_v, ngl::Vec4::m_x, ngl::Vec4::m_y, ngl::Vec4::m_z, ngl::Vec4::normalize(), ngl::Vec4::set(), and setViewMatrix().

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void ngl::Camera::normalisedPitch ( Real _angle )

noexcept

used to do a Pitch based on Euler rotation with normalised values

Parameters

[in] _angle the angle to rotate in degrees

Definition at line 316 of file Camera.cpp.

References ngl::Mat4::identity(), m_n, m_u, m_v, ngl::Mat4::rotateX(), and setViewMatrix().

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void ngl::Camera::normalisedRoll ( Real _angle )

noexcept

used to do a Roll based on Euler rotation with normalised values

Parameters

[in] _angle the angle to rotate in degrees

Definition at line 301 of file Camera.cpp.

References ngl::Mat4::identity(), m_n, m_u, m_v, ngl::Mat4::rotateZ(), and setViewMatrix().

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void ngl::Camera::normalisedYaw ( Real _angle )

noexcept

used to do a Yaw based on Euler rotation with normalised values

Parameters

[in] _angle the angle to rotate in degrees

Definition at line 287 of file Camera.cpp.

References ngl::Mat4::identity(), m_n, m_u, m_v, ngl::Mat4::rotateY(), and setViewMatrix().

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void ngl::Camera::pitch ( Real _angle )

noexcept

roll the cameara around the x axis

Parameters

[in] _angle the angle to roll in degrees

Definition at line 233 of file Camera.cpp.

References m_n, m_v, rotAxes(), and setViewMatrix().

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void ngl::Camera::roll ( Real _angle )

noexcept

roll the cameara around the Z axis

Parameters

[in] _angle the angle to roll in degrees

Definition at line 226 of file Camera.cpp.

References m_u, m_v, rotAxes(), and setViewMatrix().

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void ngl::Camera::rotAxes	(	Vec4 &	io_a,
		Vec4 &	io_b,
		const Real	_angle
	)

protectednoexcept

internal function to calculate the new rotation vectors for the camera after a roll, pitch or yaw

Parameters

[in,out]	io_a	the first vector to be rotated
[in,out]	io_b	the second vector to be rotated
[in]	_angle	the angle to rotate

Definition at line 209 of file Camera.cpp.

References ngl::Vec4::m_x, ngl::Vec4::m_y, ngl::Vec4::m_z, and ngl::radians().

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void ngl::Camera::set	(	const Vec3 &	_eye,
		const Vec3 &	_look,
		const Vec3 &	_up
	)

noexcept

set the Camera position using eye look and up vectors

Parameters

[in]	_eye	the new eye position
[in]	_look	the new look position
[in]	_up	the notional up direction of the Camera

Definition at line 70 of file Camera.cpp.

References ngl::Vec4::cross(), m_eye, m_look, m_n, m_u, m_up, m_v, ngl::Vec4::normalize(), and setViewMatrix().

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void ngl::Camera::setAspect ( Real _asp )

noexcept

re-set the aspect ratio of the camera

Parameters

[in] _asp the new aspect ratio

Definition at line 156 of file Camera.cpp.

References m_aspect, m_fov, m_zFar, m_zNear, and setShape().

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void ngl::Camera::setDefaultCamera ( )

noexcept

sets some nice default camera values

Definition at line 53 of file Camera.cpp.

References m_aspect, m_eye, m_fov, m_look, m_up, m_zFar, m_zNear, ngl::Vec4::set(), setShape(), and ngl::Vec4::up().

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void ngl::Camera::setEye ( Vec4 _e )

inlinenoexcept

set the eye position and re-calculate the matrices

Definition at line 209 of file Camera.h.

void ngl::Camera::setLook ( Vec4 _e )

inlinenoexcept

set the look position and re-calculate the matrices

Definition at line 213 of file Camera.h.

void ngl::Camera::setPerspProjection ( )

protectednoexcept

function used to set the perspective projection matrix values

Definition at line 108 of file Camera.cpp.

References ngl::Mat4::identity(), m_aspect, m_fov, ngl::Mat4::m_m, m_projectionMatrix, m_zFar, m_zNear, and ngl::radians().

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void ngl::Camera::setProjectionMatrix ( )

protectednoexcept

set the projection matrix

Definition at line 126 of file Camera.cpp.

References m_projectionMatrix, ngl::Mat4::null(), and setPerspProjection().

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void ngl::Camera::setShape	(	Real	_viewAngle,
		Real	_aspect,
		Real	_near,
		Real	_far
	)

noexcept

set the shape of the Camera

Parameters

[in]	_viewAngle	the view angle of the camera from the eye
[in]	_aspect	the aspect ratio of the camera can be calculated from Width/height
[in]	_near	the near clipping plane
[in]	_far	the far clipping plane

Definition at line 134 of file Camera.cpp.

References ngl::CAMERANEARLIMIT, m_aspect, m_fov, m_zFar, m_zNear, NGL_ASSERT, and setProjectionMatrix().

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void ngl::Camera::setViewAngle ( Real _angle )

noexcept

set the viewangle for the Camera

Parameters

[in] _angle new angle

Definition at line 163 of file Camera.cpp.

References m_aspect, m_fov, m_zFar, m_zNear, and setShape().

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void ngl::Camera::setViewMatrix ( )

protectednoexcept

method to set the modelview matrix values for the current camera, this method load the matrix Modelview into OpenGL

Definition at line 95 of file Camera.cpp.

References calculateFrustum(), ngl::Vec4::dot(), m_eye, ngl::Mat4::m_m, m_n, m_u, m_v, m_viewMatrix, ngl::Vec4::m_x, ngl::Vec4::m_y, and ngl::Vec4::m_z.

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void ngl::Camera::slide	(	Real	_du,
		Real	_dv,
		Real	_dn
	)

noexcept

slide the camera around the U V and N axis

Parameters

[in]	_du	ammount to slide in the U
[in]	_dv	ammount to slide in the V
[in]	_dn	ammount to slide in the N

Definition at line 171 of file Camera.cpp.

References m_eye, m_n, m_u, m_v, ngl::Vec4::m_x, ngl::Vec4::m_y, ngl::Vec4::m_z, and setViewMatrix().

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void ngl::Camera::update ( )

noexcept

Use is called to make this the current camera and set the MODELVIEW and PROJECTION matrices in OpenGL.

Definition at line 281 of file Camera.cpp.

References setViewMatrix().

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void ngl::Camera::writeRib ( RibExport & _rib ) const

noexcept

write out the Camera so it may be used in Renderman, this writes a transform command in rib format so the OpenGL camera mirrors that of the renderman one

Parameters

[in] _rib the pointer to the RibExport class currently being used

Todo:: make this and the rest of the Rib class work as a friend class rather than as present

Definition at line 333 of file Camera.cpp.

References ngl::Mat4::m_openGL, and m_viewMatrix.

void ngl::Camera::yaw ( Real _angle )

noexcept

roll the cameara around the y axis

Parameters

[in] _angle the angle to roll in degrees

Definition at line 240 of file Camera.cpp.

References m_n, m_u, rotAxes(), and setViewMatrix().

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Member Data Documentation

Real ngl::Camera::m_aspect

protected

used to store the current camera aspect ratio (can be derived from Width / Height

Definition at line 339 of file Camera.h.

Vec4 ngl::Camera::m_eye

protected

the position of the Camera used to calculate the local cord frame

Definition at line 319 of file Camera.h.

Vec3 ngl::Camera::m_fbl

protected

Definition at line 367 of file Camera.h.

Vec3 ngl::Camera::m_fbr

protected

Definition at line 367 of file Camera.h.

Real ngl::Camera::m_fov

protected

the feild of view of the camera view volume, measured from the eye

Definition at line 351 of file Camera.h.

Vec3 ngl::Camera::m_ftl

protected

Definition at line 367 of file Camera.h.

Vec3 ngl::Camera::m_ftr

protected

Definition at line 367 of file Camera.h.

Real ngl::Camera::m_height

protected

the height of the display image used for some perspective projection calculations

Definition at line 335 of file Camera.h.

Vec4 ngl::Camera::m_look

protected

where the camera is looking to, used with Eye to calculate the Vector m_n

Definition at line 323 of file Camera.h.

Vec4 ngl::Camera::m_n

protected

vector for the Camera local cord frame

Definition at line 315 of file Camera.h.

Vec3 ngl::Camera::m_nbl

protected

Definition at line 367 of file Camera.h.

Vec3 ngl::Camera::m_nbr

protected

Definition at line 367 of file Camera.h.

Vec3 ngl::Camera::m_ntl

protected

points for the fustrum drawing

Definition at line 367 of file Camera.h.

Vec3 ngl::Camera::m_ntr

protected

Definition at line 367 of file Camera.h.

Plane ngl::Camera::m_planes[6]

protected

array of planes for fustrum

Definition at line 359 of file Camera.h.

Mat4 ngl::Camera::m_projectionMatrix

protected

Projection a Matrix to hold the perspective transfomatio matrix for the camera.

Definition at line 371 of file Camera.h.

Vec4 ngl::Camera::m_u

protected

vector for the Camera local cord frame

Definition at line 307 of file Camera.h.

Vec4 ngl::Camera::m_up

protected

gives a general indication of which way up the camera is

Definition at line 327 of file Camera.h.

Vec4 ngl::Camera::m_v

protected

vector for the Camera local cord frame

Definition at line 311 of file Camera.h.

Mat4 ngl::Camera::m_viewMatrix

protected

a Matrix to hold the combined modelling and viewing matrix to load into OpenGL

Definition at line 355 of file Camera.h.

Real ngl::Camera::m_width

protected

the width of the display image used for some perspective projection calculations

Definition at line 331 of file Camera.h.

Real ngl::Camera::m_zFar

protected

the far clipping plane of the camera view volume

Definition at line 347 of file Camera.h.

Real ngl::Camera::m_zNear

protected

the near clipping plane of the camera view volume

Definition at line 343 of file Camera.h.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation