quick backup of changes:

[demo] / src / camera.cc

#include <gmath/gmath.h>
#include "camera.h"

Camera::Camera()
{
        phi = theta = distance = 0;
        fov = 0;
        m_projection = Mat4::identity;
}

Camera::Camera(float phi, float theta, float distance, float fov)
{
        this->phi = phi;
        this->theta = theta;
        this->distance = distance;

        this->fov = fov;
}

Camera::~Camera() {}