//----------------------------------------------------------------------------
// William Baxter III's Ray Tracer
//
//     Project for Comp 238, Raster Graphics
//     University of North Carolina at Chapel Hill
//     
// $Id:$
//----------------------------------------------------------------------------

#ifndef WB3SPHERE_H
#define WB3SPHERE_H

#include "wb3Artifact.hpp"

class wb3Sphere : public wb3Artifact
{
public:
  wb3Sphere(Vec3f center, float radius);
  ~wb3Sphere();

  virtual const wb3Artifact* Intersect(const Ray3f& r, float *idist,
                                       const wb3Artifact* ignore =0) const;
  virtual void GetNormal(const Ray3f& r, const Vec3f &isect, 
                         Vec3f& normal) const;
  
  void SetCenter(Vec3f c);
  const Vec3f& GetCenter();

  void SetRadius(float R);
  void SetRadiusSqr(float R2);
  float GetRadius() const;
  float GetRadiusSqr() const;

protected:
  Vec3f m_C; // sphere's center
  float m_fR2; // sphere's radius squared

};

//----------------------------------------------------------------------------
inline void wb3Sphere::SetRadius(float R)
{
  m_fR2 = R * R;
}
//----------------------------------------------------------------------------
inline void wb3Sphere::SetRadiusSqr(float R2)
{
  m_fR2 = R2;
}
//----------------------------------------------------------------------------
inline float wb3Sphere::GetRadius() const
{
  return float(sqrt(m_fR2));
}
//----------------------------------------------------------------------------
inline float wb3Sphere::GetRadiusSqr() const
{
  return m_fR2;
}
//----------------------------------------------------------------------------
inline void wb3Sphere::GetNormal(const Ray3f& r, const Vec3f &isect, 
                                 Vec3f& normal) const
{
  normal = (isect - m_C);
  normal.Normalize();
}
//----------------------------------------------------------------------------
#endif