class mrpt::viz::CFrustum

Overview

A solid or wireframe frustum in 3D (a rectangular truncated pyramid), with arbitrary (possibly assymetric) field-of-view angles.

You can switch whether to show only the lines, the surface of the frustum, or both. By default only the lines are drawn.

The color of the object (via CVisualObject::setColor()) affects the color of lines. To set the color of planes use setPlaneColor()

As usual in MRPT, the +X axis is assumed to by the main direction, in this case of the pyramid axis.

The horizontal and vertical FOVs can be set directly with setHorzFOV() and setVertFOV() if they are symmetric, or with setHorzFOVAsymmetric() and setVertFOVAsymmetric() otherwise.

All FOV angles are positive numbers. FOVs must be below 90deg on each side (below 180deg in total). If you try to set FOVs to larger values they’ll truncated to 89.9deg.

See also:

mrpt::viz::Scene, mrpt::viz::CRenderizable

#include <mrpt/viz/CFrustum.h>

class CFrustum:
    public mrpt::viz::CVisualObject,
    public mrpt::viz::VisualObjectParams_Triangles,
    public mrpt::viz::VisualObjectParams_Lines
{
public:
    // construction

    CFrustum();

    CFrustum(
        float near_distance,
        float far_distance,
        float horz_FOV_degrees,
        float vert_FOV_degrees,
        float lineWidth,
        bool draw_lines,
        bool draw_planes
        );

    CFrustum(const mrpt::img::TCamera& intrinsics, double focalDistScale = 5e-3);

    // methods

    void setPlaneColor(const mrpt::img::TColor& c);
    const mrpt::img::TColor& getPlaneColor() const;
    void setNearFarPlanes(const float near_distance, const float far_distance);
    float getNearPlaneDistance() const;
    float getFarPlaneDistance() const;
    void setHorzFOV(const float fov_horz_degrees);
    void setVertFOV(const float fov_vert_degrees);
    void setHorzFOVAsymmetric(const float fov_horz_left_degrees, const float fov_horz_right_degrees);
    void setVertFOVAsymmetric(const float fov_vert_down_degrees, const float fov_vert_up_degrees);
    float getHorzFOV() const;
    float getVertFOV() const;
    float getHorzFOVLeft() const;
    float getHorzFOVRight() const;
    float getVertFOVDown() const;
    float getVertFOVUp() const;
    virtual bool traceRay(const mrpt::poses::CPose3D& o, double& dist) const;
    virtual mrpt::math::TBoundingBoxf internalBoundingBoxLocal() const;
};

Inherited Members

public:
    // typedefs

    typedef std::shared_ptr<CObject> Ptr;
    typedef std::shared_ptr<const CObject> ConstPtr;
    typedef std::unique_ptr<CObject> UniquePtr;
    typedef std::unique_ptr<const CObject> ConstUniquePtr;

    // structs

    struct OutdatedState;
    struct State;

    // methods

    const auto& shaderTrianglesBuffer() const;
    auto& shaderTrianglesBufferMutex() const;
    virtual CVisualObject& setColor_u8(const mrpt::img::TColor& c);
    bool isLightEnabled() const;
    void enableLight(bool enable = true);
    TCullFace cullFaces() const;
    void notifyBBoxChange() const;
    auto getBoundingBoxLocalf() const;
    static const mrpt::rtti::TRuntimeClassId& GetRuntimeClassIdStatic();
    void setLineWidth(float w);
    float getLineWidth() const;
    void enableAntiAliasing(bool enable = true);
    bool isAntiAliasingEnabled() const;

Construction

CFrustum()

Basic empty constructor.

Set all parameters to default.

CFrustum(
    float near_distance,
    float far_distance,
    float horz_FOV_degrees,
    float vert_FOV_degrees,
    float lineWidth,
    bool draw_lines,
    bool draw_planes
    )

Constructor with some parameters

CFrustum(const mrpt::img::TCamera& intrinsics, double focalDistScale = 5e-3)

Constructor from camera intrinsic parameters: creates a frustrum with the correct vertical and horizontal FOV angles for the given camera model, in wireframe.

(New in MRPT 2.1.8)

Parameters:

intrinsics	Camera intrinsics. Distortion is ignored here.
focalDistScale	Scale for the far plane, in meters/pixels.

Methods

void setPlaneColor(const mrpt::img::TColor& c)

Changes the color of the planes; to change color of lines, use CRenderizable base methods.

void setNearFarPlanes(const float near_distance, const float far_distance)

Changes distance of near & far planes.

void setHorzFOV(const float fov_horz_degrees)

Changes horizontal FOV (symmetric)

void setVertFOV(const float fov_vert_degrees)

Changes vertical FOV (symmetric)

void setHorzFOVAsymmetric(
    const float fov_horz_left_degrees,
    const float fov_horz_right_degrees
    )

Changes horizontal FOV (asymmetric)

void setVertFOVAsymmetric(
    const float fov_vert_down_degrees,
    const float fov_vert_up_degrees
    )

Changes vertical FOV (asymmetric)

virtual bool traceRay(const mrpt::poses::CPose3D& o, double& dist) const

Simulation of ray-trace, given a pose.

Returns true if the ray effectively collisions with the object (returning the distance to the origin of the ray in “dist”), or false in other case. “dist” variable yields undefined behaviour when false is returned

virtual mrpt::math::TBoundingBoxf internalBoundingBoxLocal() const

Must be implemented by derived classes to provide the updated bounding box in the object local frame of coordinates.

This will be called only once after each time the derived class reports to notifyChange() that the object geometry changed.