erebus

view liberebus/src/rt.cc @ 18:09028848f276

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- implemented Box object intersection - implemented interactive camera manipulation
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 26 May 2014 23:34:12 +0300
parents e9da2916bc79
children 56d504cc555a
line source
1 #include <assert.h>
2 #include "rt.h"
3 #include "erebus_impl.h"
4
5 #define MAX_ITER 8
6
7 Color ray_trace(struct erebus *ctx, const Ray &ray, int iter)
8 {
9 const Scene *scn = ctx->scn;
10 if(!scn) {
11 return Color(1, 0, 0);
12 }
13
14 RayHit hit;
15 if(!(scn->intersect(ray, &hit))) {
16 return scn->get_env_color(ray);
17 }
18
19 return shade(ctx, hit, iter);
20 }
21
22 Color shade(struct erebus *ctx, const RayHit &hit, int iter)
23 {
24 assert(hit.obj->get_type() == ObjType::geom);
25 int max_iter = erb_getopti(ctx, ERB_OPT_MAX_ITER);
26 const Scene *scn = ctx->scn;
27 const GeomObject *obj = (const GeomObject*)hit.obj;
28 const Material *mtl = &obj->mtl;
29 const Reflectance *brdf = obj->brdf;
30 const Ray &ray = hit.world_ray;
31
32 Vector3 norm = hit.calc_normal();
33 //return norm * 0.5 + Vector3(0.5, 0.5, 0.5);
34 Vector2 texcoords = hit.calc_texcoords();
35
36 Color color = mtl->get_attrib_color("diffuse", texcoords.x, texcoords.y);
37 Color res = mtl->get_attrib_color("emissive") + color * scn->get_env().ambient;
38
39 Vector3 sample_dir;
40 float prob = brdf->sample(norm, -hit.world_ray.dir, &sample_dir);
41 if(iter < max_iter && randf() <= prob) {
42 Ray sample_ray;
43 sample_ray.origin = ray.origin + ray.dir * hit.dist;
44 sample_ray.dir = sample_dir;
45
46 res += ray_trace(ctx, sample_ray, iter + 1) * color;
47 }
48 return res;
49 }