annotate liberebus/src/rt.cc @ 12:ea4bcf186d66
whatever
| author |
John Tsiombikas <nuclear@member.fsf.org> |
| date |
Sat, 24 May 2014 21:52:19 +0300 |
| parents |
bb006fb96f1b |
| children |
e9da2916bc79 |
| rev |
line source |
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1 #include <assert.h>
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2 #include "rt.h"
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3 #include "erebus_impl.h"
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4
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5 #define MAX_ITER 8
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6
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7 Color ray_trace(const Ray &ray, const Scene *scn, int iter)
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8 {
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9 RayHit hit;
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10 if(!(scn->intersect(ray, &hit))) {
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11 return scn->get_env_color(ray);
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12 }
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13
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14 return shade(hit, scn, iter);
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15 }
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16
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17 Color shade(const RayHit &hit, const Scene *scn, int iter)
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18 {
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19 assert(hit.obj->get_type() == ObjType::geom);
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20 const GeomObject *obj = (const GeomObject*)hit.obj;
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21 const Material *mtl = &obj->mtl;
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22 const Reflectance *brdf = obj->brdf;
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23 const Ray &ray = hit.world_ray;
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24
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25 Vector3 norm = obj->calc_normal(hit);
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26 Vector2 texcoords = obj->calc_texcoords(hit);
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27
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28 Color color = mtl->get_attrib_color("albedo", texcoords.x, texcoords.y);
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29 Color res = mtl->get_attrib_color("emissive") + color * scn->get_env().ambient;
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30
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31 Vector3 sample_dir;
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32 float prob = brdf->sample(norm, -hit.world_ray.dir, &sample_dir);
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33 if(iter < MAX_ITER && randf() <= prob) {
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34 Ray sample_ray;
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35 sample_ray.origin = ray.origin + ray.dir * hit.dist;
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36 sample_ray.dir = sample_dir;
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37
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38 res += ray_trace(sample_ray, scn, iter + 1) * color;
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39 }
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40 return res;
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41 }
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