/*
 *  Ray++ - Object-oriented ray tracing library
 *  Copyright (C) 1998-2001 Martin Reinecke and others.
 *  See the AUTHORS file for more information.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  See the README file for more information.
 */

/*
   Demo for gaseous volume
   This is a simple program which creates an image of
   gaseous sphere with varying density around a solid 
   sphere.
*/

#include "kernel/globals.h"
#include "kernel/handle.h"
#include "worlds/scene.h"
#include "renderers/raytracer.h"
#include "outputs/tga_output.h"
#include "shapes/sphere.h"
#include "shapes/plane.h"
#include "surfaces/matte.h"
#include "volumes/fog.h"
#include "volumes/gas2.h"
#include "objects/simple_object.h"
#include "lights/pointlight.h"
#include "lights/ambient_light.h"
#include "cameras/std_camera.h"

namespace RAYPP {

class Dens1: public GAS2::OPACITY_FUNCTOR
  {
  public:
    COLOUR Get_Opacity (const VECTOR &) const
      {
      return COLOUR(0.5,0.5,0.5);
      }
  };

} // namespace RAYPP

int main ()
  {
  using namespace RAYPP;

  HANDLE<OUTPUT> Output;

  Output = Cnew TGA_OUTPUT (640, 480, "gastest.tga");
  Output->Init();

  RAYTRACER *Raytracer = Cnew RAYTRACER;
  SCENE *Scn = Cnew SCENE;

  Raytracer->Add (Cnew STD_CAMERA (VECTOR (0,1.5,-4.5), VECTOR (0,0,0)));

  SIMPLE_OBJECT *obj;
  uint4 Priority = 1;

//create a gaseous sphere
  obj = Cnew SIMPLE_OBJECT;
  obj->Set_Shape (Cnew SPHERE);
  obj->Set_Priority (Priority);
//Set volume to Gas 
  obj->Set_Volume (Cnew GAS2 (GAS2::RAYLEIGH, Cnew Dens1));
  Scn->Add (obj);

//create a smaller sphere inside the gaseous sphere
  obj = Cnew SIMPLE_OBJECT;
  obj->Set_Shape (Cnew SPHERE);
  obj->Scale (0.6);
  obj->Set_Surface (Cnew MATTE (0.2, 0.8, COLOUR(1,0.5,0.5)));
  obj->Set_Priority (Priority);
  Scn->Add (obj);

  Scn->Add (Cnew POINTLIGHT (VECTOR (15,10,-5), COLOUR (350,350,350)));

  World = Scn;
  World->Init();

  Renderer = Raytracer;
  Renderer->Init();

  Output->Render();
  }