Material.h

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/**
@file Material.h
@author JOL
*/
#pragma once
#ifndef _MATERIAL_H_
#define _MATERIAL_H_
 
#include "Color.h"
 
// @see http://devernay.free.fr/cours/opengl/materials.html
 
/// Namespace RayTracer
namespace rt {
 
  /// This structure stores the material associated to a graphical object.
  /// object should have.
  struct Material {
    /// ambient color
    Color ambient;
    /// diffuse color
    Color diffuse;
    /// specular color
    Color specular;
    /// shinyness (50: very high, 1: low )
    Real shinyness;
 
    // --------- The following data is used in later questions. --------------
 
    /// The material is perfectly diffuse if coef_diffusion == 1.0,
    /// otherwise it may have reflexion / transparency properties.
    Real coef_diffusion;
    /// The material has some specularity if coef_reflexion > 0.0
    Real coef_reflexion;
    /// The material is transparent if coef_refraction > 0.0
    Real coef_refraction;
    /// Refractive index (1.0f in vacuum, 1.31 in ice, 1.52 window glass, 1.33 water
    /// Inside refractive index (for transparent medium) (>= 1.0f)
    Real in_refractive_index;
    /// Outside refractive index (1.0f if object is in the air otherwise >= 1.0f)
    Real out_refractive_index;
 
    /// Mixes two material (t=0 gives m1, t=1 gives m2, t=0.5 gives their average)
    static Material mix( Real t, const Material& m1, const Material& m2 )
    {
      Material m;
      Real s = 1.0f - t;
      m.ambient = s * m1.ambient + t * m2.ambient;
      m.diffuse = s * m1.diffuse + t * m2.diffuse;
      m.specular = s * m1.specular + t * m2.specular;
      m.shinyness = s * m1.shinyness + t * m2.shinyness;
      m.coef_diffusion = s * m1.coef_diffusion + t * m2.coef_diffusion;
      m.coef_reflexion = s * m1.coef_reflexion + t * m2.coef_reflexion;
      m.coef_refraction = s * m1.coef_refraction + t * m2.coef_refraction;
      m.in_refractive_index = s * m1.in_refractive_index + t * m2.in_refractive_index;
      m.out_refractive_index = s * m1.out_refractive_index + t * m2.out_refractive_index;
      return m;
    }
    
    /// Default constructor
    Material() {}
 
    /// Constructor from colors and shinyness.
    Material( Color amb, Color diff, Color spec, Real shiny = 0.0f,
              Real cdiff = 1.0f, Real crefl = 0.0f, Real crefr = 0.0f,
              Real in_ridx = 1.0f, Real out_ridx = 1.0f )
      : ambient( amb ), diffuse( diff ), specular( spec ), shinyness( shiny ),
        coef_diffusion( cdiff ), coef_reflexion( crefl ), coef_refraction( crefr ),
        in_refractive_index( in_ridx ), out_refractive_index( out_ridx )
    {}
    
    static Material whitePlastic() 
    {
      Material m;
      m.ambient   = Color( 0.1, 0.1, 0.1 );
      m.diffuse   = Color( 0.7, 0.7, 0.7 );
      m.specular  = Color( 1.0, 1.0, 0.98 );
      m.shinyness = 5.0;
      m.coef_diffusion  = 0.9f;
      m.coef_reflexion  = 0.1f;
      m.coef_refraction = 0.0f;
      m.in_refractive_index  = 1.0f;
      m.out_refractive_index = 1.0f;
      return m;
    }
    static Material redPlastic() 
    {
      Material m;
      m.ambient   = Color( 0.1, 0.0, 0.0 );
      m.diffuse   = Color( 0.85, 0.05, 0.05 );
      m.specular  = Color( 1.0, 0.8, 0.8 );
      m.shinyness = 5.0;
      m.coef_diffusion  = 1.0f;
      m.coef_reflexion  = 0.05f;
      m.coef_refraction = 0.0f;
      m.in_refractive_index  = 1.0f;
      m.out_refractive_index = 1.0f;
      return m;
    }
    static Material bronze() 
    {
      Material m;
      m.ambient   = Color( 0.1125, 0.0675, 0.054 );
      m.diffuse   = Color( 0.714, 0.4284, 0.18144 );
      m.specular  = Color( 0.9, 0.8, 0.7 );
      // m.specular  = Color( 0.393548, 0.271906, 0.166721 );
      m.shinyness = 56; // 25.6;
      m.coef_diffusion  = 0.5f;
      m.coef_reflexion  = 0.75f;
      m.coef_refraction = 0.0f;
      m.in_refractive_index  = 1.0f;
      m.out_refractive_index = 1.0f;
      return m;
    }
    static Material emerald() 
    {
      Material m;
      m.ambient   = Color( 0.0f, 0.01f, 0.0f ); //Color( 0.0215, 0.1745, 0.0215 );
      m.diffuse   = Color( 0.09568, 0.77424, 0.10 );
      m.specular  = Color( 0.9, 1.0, 0.9 ); // Color( 0.633, 0.727811, 0.633 );
      m.shinyness = 0.6*128.0;
      m.coef_diffusion  = 0.15f;
      m.coef_reflexion  = 0.5f;
      m.coef_refraction = 0.65f;
      m.in_refractive_index  = 1.5f;
      m.out_refractive_index = 1.0f;
      return m;
    }
    static Material glass() 
    {
      Material m;
      m.ambient   = Color( 0.0, 0.0, 0.0 );
      m.diffuse   = Color( 0.95, 0.95, 1.0 );
      m.specular  = Color( 1.0, 1.0, 1.0 );
      m.shinyness = 80.0f;
      m.coef_diffusion  = 0.01f;
      m.coef_reflexion  = 0.05f;
      m.coef_refraction = 0.98f;
      m.in_refractive_index  = 1.5f;
      m.out_refractive_index = 1.0f;
      return m;
    }
  };
 
  
 
} // namespace rt
 
#endif // #define _MATERIAL_H_