Subversion Repositories gelsvn

Rev

Rev 309 | Rev 318 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
304 jab 1 
#ifndef __RAY_H__
2 
#define __RAY_H__
3 
 
4 
#include "../CGLA/Vec3i.h"
5 
#include "../CGLA/Vec3f.h"
6 
#include "TriMesh.h"
7 
 
8 
namespace Geometry
9 
{
310 jrf 10 
		const double d_eps = 1.0e-6;
11 
		const float f_eps = 1.0e-2f;
304 jab 12 
 
309 jab 13 
		struct Ray
14 
		{
15 
				// Constructor
16 
				Ray()
17 
						: origin(0.0f), direction(0.0f), hit_pos(0.0f), hit_normal(0.0f),
304 jab 18 
        has_hit(false), dist(CGLA::BIG), ior(1.0f), u(0.0f), v(0.0f),
309 jab 19 
				hit_object(0)
20 
						{ }
304 jab 21 
 
309 jab 22 
				Ray(const CGLA::Vec3f& _origin, const CGLA::Vec3f& _direction)
23 
						: origin(_origin), direction(_direction), hit_pos(0.0f), hit_normal(0.0f),
304 jab 24 
        has_hit(false), dist(CGLA::BIG), ior(1.0f), u(0.0f), v(0.0f),
309 jab 25 
				hit_object(0)
26 
						{ }
304 jab 27 
 
309 jab 28 
				CGLA::Vec3f origin;
29 
				CGLA::Vec3f direction;
30 
				CGLA::Vec3f hit_pos;
31 
				CGLA::Vec3f hit_normal;
304 jab 32 
 
309 jab 33 
				bool has_hit; // Did the ray hit an object
304 jab 34 
 
309 jab 35 
				double dist;  // Distance from origin to current intersection
36 
				float ior;    // Current index of refraction for media
37 
				float u, v;   // uv-coordinates on current surface
38 
				float ran;
304 jab 39 
 
309 jab 40 
				int trace_depth;  // Current recursion number
41 
				size_t hit_face_id;
42 
				int id;
304 jab 43 
 
309 jab 44 
				Geometry::TriMesh* hit_object;
304 jab 45 
 
309 jab 46 
				void reset()
47 
						{
48 
								dist = CGLA::BIG;
49 
								hit_object = 0;
50 
								u=0.0f;
51 
								v=0.0f;
52 
								has_hit=false;
53 
						}
304 jab 54 
 
309 jab 55 
				void compute_position()
56 
						{
57 
								hit_pos = origin + dist*direction;
58 
						}
304 jab 59 
 
309 jab 60 
				void compute_normal()
61 
						{
62 
								CGLA::Vec3i face = hit_object->normals.face(hit_face_id);
63 
								CGLA::Vec3f normal0 = hit_object->normals.vertex(face[0]);
64 
								CGLA::Vec3f normal1 = hit_object->normals.vertex(face[1]);
65 
								CGLA::Vec3f normal2 = hit_object->normals.vertex(face[2]);
66 
								hit_normal = normalize(normal0*(1 - u - v) + normal1*u + normal2*v);
67 
						}
304 jab 68 
 
309 jab 69 
				void reflect(const CGLA::Vec3f &normal)
70 
						{
71 
								assert(dot(direction, normal) < 0.0f);
72 
								direction = normal*2.0f*dot(-direction,normal) + direction;
73 
						}
304 jab 74 
 
309 jab 75 
				void refract(const CGLA::Vec3f& normal, float new_ior)
76 
						{
77 
								float ref_ratio = ior/new_ior;
78 
								float cos_N_I = dot(normal, direction);
79 
								CGLA::Vec3f norm(normal);
304 jab 80 
 
309 jab 81 
								if(cos_N_I > 0.0f)
82 
								{
83 
										norm = -norm;
84 
										cos_N_I = dot(norm, direction);
85 
								}
304 jab 86 
 
309 jab 87 
								float selector = 1+(ref_ratio*ref_ratio)*(cos_N_I*cos_N_I - 1);
304 jab 88 
 
309 jab 89 
								if(selector > 0.0f)
90 
								{
91 
										direction = norm*(ref_ratio*(-cos_N_I) - sqrt(selector))
92 
												+ direction*ref_ratio;
93 
										ior = new_ior;
94 
								}
95 
								else
96 
										// Total internal reflection.
97 
										reflect(normal);
98 
						}
304 jab 99 
 
309 jab 100 
				bool cond_set_parameter(float t, float _u, float _v,
101 
																Geometry::TriMesh* mesh, size_t idx)
102 
						{
103 
								if(t < dist)
104 
								{
105 
										dist = t;
106 
										u = _u;
107 
										v = _v;
108 
										hit_object = mesh;
109 
										hit_face_id = idx;
110 
										has_hit = true;
111 
								}
112 
						}
113 
		};
304 jab 114 
}
115 
#endif
116