class mrpt::opengl::CCamera

Overview

Defines the intrinsic and extrinsic camera coordinates from which to render a 3D scene.

By default, each viewport has its own camera, accesible via Viewport::getCamera(), but if a CCamera object is added as an object to be rendered, it will override the internal viewport camera.

Available projection models:

Projective model, parameterized via setProjectiveFOVdeg() (vertical field of view, in degrees)
Projective model, by means of a computer vision pinhole intrinsic parameter set: see setProjectiveFromPinhole()
Orthogonal projection model: use setProjectiveModel(false), or setOrthogonal(), or
No projection mode: use setNoProjection(). Viewport coordinates are fixed to bottomLeft=(-1,-1) to rightTop=(+1,+1).

Defining the position and orientation of a camera is possible by:

Using an “orbit” model: defined by a “pointing to” point, a distance to object, and azimuth + elevation angles; or
Directly giving the SE(3) camera pose, setting the set6DOFMode() to true and storing the desired pose with CRenderizable::setPose(). Pose axis convention is +Z pointing forwards, +X right, +Y down.

See also:

opengl::Scene

#include <mrpt/opengl/CCamera.h>

class CCamera: public mrpt::opengl::CRenderizable
{
public:
    // construction

    CCamera();

    // methods

    void setProjectiveModel(bool v = true);
    void setOrthogonal(bool v = true);
    void setProjectiveFromPinhole(const mrpt::img::TCamera& camIntrinsics);
    void setNoProjection();
    void setProjectiveFOVdeg(float ang);
    float getProjectiveFOVdeg() const;
    bool hasPinholeModel() const;
    const std::optional<mrpt::img::TCamera>& getPinholeModel() const;
    bool isProjective() const;
    bool isOrthogonal() const;
    bool isNoProjection() const;

    void setPointingAt(
        float x,
        float y,
        float z
        );

    template <class POSEORPOINT>
    void setPointingAt(const POSEORPOINT& p);

    void setPointingAt(const mrpt::math::TPoint3D& p);
    float getPointingAtX() const;
    float getPointingAtY() const;
    float getPointingAtZ() const;
    mrpt::math::TPoint3Df getPointingAt() const;
    void setZoomDistance(float z);
    float getZoomDistance() const;
    float getAzimuthDegrees() const;
    float getElevationDegrees() const;
    void setAzimuthDegrees(float ang);
    void setElevationDegrees(float ang);
    void set6DOFMode(bool v);
    bool is6DOFMode() const;
    virtual void toYAMLMap(mrpt::containers::yaml& propertiesMap) const;
    virtual shader_list_t requiredShaders() const;
    virtual void render(const RenderContext&) const;
    virtual void renderUpdateBuffers() const;
    virtual mrpt::math::TBoundingBoxf internalBoundingBoxLocal() const;
    virtual void freeOpenGLResources();
};

Inherited Members

public:
    // structs

    struct OutdatedState;
    struct RenderContext;
    struct State;

    // methods

    virtual void render(const RenderContext& rc) const = 0;
    virtual void renderUpdateBuffers() const = 0;
    virtual shader_list_t requiredShaders() const;
    virtual void freeOpenGLResources() = 0;

Methods

void setProjectiveModel(bool v = true)

Enable/Disable projective mode (vs.

orthogonal).

void setOrthogonal(bool v = true)

Enable/Disable orthogonal mode (vs.

projective)

void setNoProjection()

Disable all coordinate transformations and allow direct use of pixel coordinates, that is, the projection matrix is the identity.

In this mode, (-1,-1) is the bottom-left corner and (+1,+1) the top-right corner, per OpenGL defaults. This mode can be disabled calling setProjectiveModel() or setOrthogonal()

void setProjectiveFOVdeg(float ang)

Vertical field-of-View in degs, only when projectiveModel=true (default=30 deg).

float getProjectiveFOVdeg() const

Field-of-View in degs, only when projectiveModel=true (default=30 deg).

void set6DOFMode(bool v)

Set 6DOFMode, if enabled camera is set according to its pose, set via CRenderizable::setPose().

(default=false). Conventionally, eye is set looking towards +Z axis, “down” is the +Y axis, right is “+X” axis. In this mode azimuth/elevation are ignored.

virtual void toYAMLMap(mrpt::containers::yaml& propertiesMap) const

Used from Scene::asYAML().

(New in MRPT 2.4.2)

virtual shader_list_t requiredShaders() const

Returns the ID of the OpenGL shader program required to render this class.