CylindricCamera.h

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#ifndef CYLINDRICCAMERA_H
#define CYLINDRICCAMERA_H CYLINDRICCAMERA_H

#include "Camera.h"

class CylindricCamera : public Camera
{
    Vector3D pos;
    
    Vector3D up;
    
    float height;
    
    float radius;

    float invResX;

    float invResY;
  
public:

    CylindricCamera(Vector3D pos,Vector3D up,
            float height, float radius,
            int resX, int resY
            )
        : Camera(resX,resY),pos(pos),up(up),height(height),radius(radius)
    {
        invResX = 1.0 / float(resX);
        invResY = 1.0 / float(resY); 
    }

    virtual ~CylindricCamera()
    {}

    virtual Ray InitRay(float x, float y)
    {
        Ray ray;
        // precompute angles
        float alpha = x * invResX * 2.0 * M_PI;

        // compute ray direction
        Vector3D p;
        p.x() = cos(alpha) * radius;
        p.y() = height * 0.5 - y * invResY;
        p.z() = sin(alpha) * radius;

        // set position and normalized direction
        ray.org = pos + p;
        ray.dir = -p.Normalized();

        return ray;
    }

};

#endif

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