Camera.h

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// The MIT License (MIT)
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#pragma once

#include <Eigen/Geometry>

namespace open3d {
namespace visualization {
namespace rendering {

class Camera {
public:
    enum class FovType { Vertical, Horizontal };
    enum class Projection { Perspective, Ortho };
    using Transform = Eigen::Transform<float, 3, Eigen::Affine>;

    virtual ~Camera() = default;

    virtual void SetProjection(double fov,
                               double aspect,
                               double near,
                               double far,
                               FovType fov_type) = 0;

    virtual void SetProjection(Projection projection,
                               double left,
                               double right,
                               double bottom,
                               double top,
                               double near,
                               double far) = 0;

    virtual void SetProjection(const Eigen::Matrix3d& intrinsics,
                               double near,
                               double far,
                               double width,
                               double height) = 0;

    virtual void LookAt(const Eigen::Vector3f& center,
                        const Eigen::Vector3f& eye,
                        const Eigen::Vector3f& up) = 0;

    virtual void SetModelMatrix(const Transform& view) = 0;
    virtual void SetModelMatrix(const Eigen::Vector3f& forward,
                                const Eigen::Vector3f& left,
                                const Eigen::Vector3f& up) = 0;

    virtual double GetNear() const = 0;
    virtual double GetFar() const = 0;
    virtual double GetFieldOfView() const = 0;
    virtual FovType GetFieldOfViewType() const = 0;

    virtual Eigen::Vector3f GetPosition() const = 0;
    virtual Eigen::Vector3f GetForwardVector() const = 0;
    virtual Eigen::Vector3f GetLeftVector() const = 0;
    virtual Eigen::Vector3f GetUpVector() const = 0;
    virtual Transform GetModelMatrix() const = 0;
    virtual Transform GetViewMatrix() const = 0;
    virtual Transform GetProjectionMatrix() const = 0;

    // Returns the normalized device coordinates (NDC) of the specified point
    // given the view and projection matrices of the camera. The returned point
    // is in the range [-1, 1] if the point is in view, or outside the range if
    // the point is out of view.
    virtual Eigen::Vector2f GetNDC(const Eigen::Vector3f& pt) const = 0;

    struct ProjectionInfo {
        bool is_ortho;
        bool is_intrinsic;
        union {
            struct {
                Projection projection;
                double left;
                double right;
                double bottom;
                double top;
                double near_plane;  // Windows #defines "near"
                double far_plane;   // Windows #defines "far"
            } ortho;
            struct {
                FovType fov_type;
                double fov;
                double aspect;
                double near_plane;
                double far_plane;
            } perspective;
            struct {
                double fx;
                double fy;
                double cx;
                double cy;
                double near_plane;
                double far_plane;
                double width;
                double height;
            } intrinsics;
        } proj;
    };
    virtual const ProjectionInfo& GetProjection() const = 0;

    virtual void CopyFrom(const Camera* camera) = 0;
};

}  // namespace rendering
}  // namespace visualization
}  // namespace open3d