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304 jab 1 
#ifndef __RAY_H__
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#define __RAY_H__
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#include "../CGLA/Vec3i.h"
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#include "../CGLA/Vec3f.h"
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#include "TriMesh.h"
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namespace Geometry
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{
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		const double d_eps = 1.0e-12;
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		const float f_eps = 1.0e-6f;
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		struct Ray
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		{
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				// Constructor
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				Ray()
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						: origin(0.0f), direction(0.0f), hit_pos(0.0f), hit_normal(0.0f),
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        has_hit(false), dist(CGLA::BIG), ior(1.0f), u(0.0f), v(0.0f),
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				hit_object(0)
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						{ }
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				Ray(const CGLA::Vec3f& _origin, const CGLA::Vec3f& _direction)
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						: origin(_origin), direction(_direction), hit_pos(0.0f), hit_normal(0.0f),
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        has_hit(false), dist(CGLA::BIG), ior(1.0f), u(0.0f), v(0.0f),
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				hit_object(0)
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						{ }
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				CGLA::Vec3f origin;
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				CGLA::Vec3f direction;
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				CGLA::Vec3f hit_pos;
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				CGLA::Vec3f hit_normal;
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				bool has_hit; // Did the ray hit an object
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        bool inside;  // Is the ray inside an object
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				double dist;  // Distance from origin to current intersection
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				float ior;    // Current index of refraction for media
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				float u, v;   // uv-coordinates on current surface
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				float ran;
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				int trace_depth;  // Current recursion number
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				size_t hit_face_id;
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				int id;
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				const Geometry::TriMesh* hit_object;
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				void reset()
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						{
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								dist = CGLA::BIG;
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								hit_object = 0;
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								u=0.0f;
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								v=0.0f;
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								has_hit=false;
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						}
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				void compute_position()
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						{
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								hit_pos = origin + dist*direction;
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						}
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				void compute_normal()
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						{
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								CGLA::Vec3i face = hit_object->normals.face(hit_face_id);
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								CGLA::Vec3f normal0 = hit_object->normals.vertex(face[0]);
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								CGLA::Vec3f normal1 = hit_object->normals.vertex(face[1]);
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								CGLA::Vec3f normal2 = hit_object->normals.vertex(face[2]);
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								hit_normal = normalize(normal0*(1 - u - v) + normal1*u + normal2*v);
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						}
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				void reflect(const CGLA::Vec3f &normal)
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						{
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								assert(dot(direction, normal) < 0.0f);
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								direction = normal*2.0f*dot(-direction,normal) + direction;
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						}
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				void refract(const CGLA::Vec3f& normal, float new_ior)
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						{
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								float ref_ratio = ior/new_ior;
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								float cos_N_I = dot(normal, direction);
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								CGLA::Vec3f norm(normal);
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								if(cos_N_I > 0.0f)
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								{
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										norm = -norm;
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										cos_N_I = dot(norm, direction);
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								}
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								float selector = 1+(ref_ratio*ref_ratio)*(cos_N_I*cos_N_I - 1);
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								if(selector > 0.0f)
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								{
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										direction = norm*(ref_ratio*(-cos_N_I) - sqrt(selector))
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												+ direction*ref_ratio;
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										ior = new_ior;
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								}
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								else
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										// Total internal reflection.
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										reflect(normal);
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						}
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				bool cond_set_parameter(float t, float _u, float _v,
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																Geometry::TriMesh* mesh, size_t idx)
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						{
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								if(t < dist)
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								{
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										dist = t;
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										u = _u;
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										v = _v;
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										hit_object = mesh;
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										hit_face_id = idx;
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										has_hit = true;
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										return true;
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								}
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								return false;
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						}
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		};
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}
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#endif
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