Avogadro::Rendering::Camera

class Camera

The Camera class provides utility functionality useful in camera’s used with 3D scenes.

Author

Marcus D. Hanwell

Public Functions

Camera()

Camera(const Camera &o)

Camera &operator=(const Camera &o)

~Camera()

void translate(const Vector3f &translate)

Translate the camera’s model view matrix using the supplied translation vector translate.

void preTranslate(const Vector3f &translate)

Pretranslate the camera’s model view matrix using the supplied translation vector translate.

void rotate(float angle, const Vector3f &axis)

Rotate the camera about the supplied axis by angle (degrees).

void preRotate(float angle, const Vector3f &axis)

Prerotate the camera about the supplied axis by angle (degrees).

void scale(float scale)

Modify the matrix, to give the effect of zooming in or out.

void lookAt(const Vector3f &eye, const Vector3f &center, const Vector3f &up)

Set the model-view matrix to the “look at” transformation matrix.

Parameters:

• eye – the position of the eye/camera.

• center – the position to look at.

• up – the vector pointing up.

float distance(const Vector3f &point) const

Distance to supplied point point and the camera.

Vector3f project(const Vector3f &point) const

Projects a point from the scene to the window.

Vector3f unProject(const Vector3f &point) const

Unprojects a point from the window to the scene.

Vector3f unProject(const Vector2f &point, const Vector3f &reference = Vector3f::Zero()) const

Unprojects a point from the window to the scene, using the supplied reference point (defaults to the origin if nothing is supplied).

void calculatePerspective(float fieldOfView, float aspectRatio, float zNear, float zFar)

Calculate the perspective projection matrix.

Parameters:

• fieldOfView – angle in degrees in the y direction.

• aspectRatio – is the ratio of width to height.

• zNear – is the distance from the viewer to the near clipping plane.

• zFar – is the distance from the viewer to the far clipping plane.

void calculatePerspective(float fieldOfView, float zNear, float zFar)

Calculate the perspective projection matrix. Computes the aspect ratio from the width and height stored by the Camera object.

Parameters:

• fieldOfView – angle in degrees in the y direction.

• zNear – is the distance from the viewer to the near clipping plane.

• zFar – is the distance from the viewer to the far clipping plane.

void calculatePerspective(float left, float right, float bottom, float top, float zNear, float zFar)

Calculate the perspective projection matrix using frustum planes coordinates.

Parameters:

• left – left vertical clipping plane.

• right – right vertical clipping plane.

• bottom – bottom horizontal clipping plane.

• top – top horizontal clipping plane.

• zNear – distance to the near clipping plane.

• zFar – distance to the far clipping plane.

void calculateOrthographic(float left, float right, float bottom, float top, float zNear, float zFar)

Calculate the orthographic projection matrix.

Parameters:

• left – left vertical clipping plane.

• right – right vertical clipping plane.

• bottom – bottom horizontal clipping plane.

• top – top horizontal clipping plane.

• zNear – distance to the near clipping plane.

• zFar – distance to the far clipping plane.

void setViewport(int w, int h)

Set the dimensions of the viewport in pixels.

inline int width() const

Get the width of the viewport in pixels.

inline int height() const

Get the height of the viewport in pixels.

inline void setIdentity()

Set the model view matrix to the identity. This resets the model view matrix.

void setProjection(const Eigen::Affine3f &transform)

Set the projection transform.

inline const Eigen::Affine3f &projection() const

Get a reference to the projection matrix.

void setModelView(const Eigen::Affine3f &transform)

Set the model view transform.

inline const Eigen::Affine3f &modelView() const

Get a reference to the model view matrix.

inline void setProjectionType(Projection proj)

Set the projection type for this camera (Perspective or Orthographic).

Parameters:

proj – The projection type to use.

inline Projection projectionType() const

Get the projection type the camera is using.

Returns:

The current projection type.

inline void setOrthographicScale(float newScale)

Set the orthographic scale, this defaults to 1.0. Affects calculation of the orthographic projection matrix.

Parameters:

newScale – The factor to scale orthographic projection by.

inline float orthographicScale() const

Get the value of the orthographic scale, defaults to 1.0.

Returns:

The current value of the orthographic scale.

inline void setFocus(const Eigen::Vector3f &newFocus)

Set focused point. Navigation actions shall occur relative to it. Note that this method does not cause any change in camera matrices.

inline Vector3f focus() const

Get focused point. Navigation actions shall occur relative to it.