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nuclear@8
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1 #include <assert.h>
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nuclear@6
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2 #include "rt.h"
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nuclear@8
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3 #include "erebus_impl.h"
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nuclear@8
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4
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nuclear@8
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5 #define MAX_ITER 8
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nuclear@6
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6
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nuclear@17
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7 Color ray_trace(struct erebus *ctx, const Ray &ray, int iter)
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nuclear@6
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8 {
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nuclear@17
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9 const Scene *scn = ctx->scn;
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nuclear@17
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10 if(!scn) {
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nuclear@17
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11 return Color(1, 0, 0);
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nuclear@17
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12 }
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nuclear@17
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13
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nuclear@6
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14 RayHit hit;
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nuclear@6
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15 if(!(scn->intersect(ray, &hit))) {
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nuclear@8
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16 return scn->get_env_color(ray);
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nuclear@6
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17 }
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nuclear@6
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18
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nuclear@17
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19 return shade(ctx, hit, iter);
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nuclear@6
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20 }
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nuclear@6
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21
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nuclear@17
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22 Color shade(struct erebus *ctx, const RayHit &hit, int iter)
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nuclear@6
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23 {
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nuclear@8
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24 assert(hit.obj->get_type() == ObjType::geom);
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nuclear@17
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25 int max_iter = erb_getopti(ctx, ERB_OPT_MAX_ITER);
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nuclear@17
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26 const Scene *scn = ctx->scn;
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nuclear@8
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27 const GeomObject *obj = (const GeomObject*)hit.obj;
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nuclear@8
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28 const Material *mtl = &obj->mtl;
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nuclear@8
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29 const Reflectance *brdf = obj->brdf;
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nuclear@8
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30 const Ray &ray = hit.world_ray;
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nuclear@8
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31
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nuclear@17
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32 Vector3 norm = hit.calc_normal();
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nuclear@18
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33 //return norm * 0.5 + Vector3(0.5, 0.5, 0.5);
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nuclear@17
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34 Vector2 texcoords = hit.calc_texcoords();
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nuclear@8
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35
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nuclear@17
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36 Color color = mtl->get_attrib_color("diffuse", texcoords.x, texcoords.y);
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nuclear@8
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37 Color res = mtl->get_attrib_color("emissive") + color * scn->get_env().ambient;
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nuclear@8
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38
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nuclear@8
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39 Vector3 sample_dir;
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nuclear@8
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40 float prob = brdf->sample(norm, -hit.world_ray.dir, &sample_dir);
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nuclear@17
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41 if(iter < max_iter && randf() <= prob) {
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nuclear@8
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42 Ray sample_ray;
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nuclear@8
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43 sample_ray.origin = ray.origin + ray.dir * hit.dist;
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nuclear@8
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44 sample_ray.dir = sample_dir;
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nuclear@8
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45
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nuclear@17
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46 res += ray_trace(ctx, sample_ray, iter + 1) * color;
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nuclear@8
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47 }
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nuclear@8
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48 return res;
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nuclear@6
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49 }
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