t_vec3f single_tracer(t_params p, t_ray *ray, t_objects *sp)
{
int i;
t_vec3f trans;
t_vec3f tmp;
t_vec3f light_dir;
t_color scolor;
i = 0;
if (dot_vec3f(&ray->dir, &p.nhit) > 0)
p.nhit = scale_vec3f(&p.nhit, -1);
scolor = new_uni_color(0);
while (i < sp->top)
{
if (sp->store[i].type == LIGHT)
{
light_dir = normalize_vec3f(sub_vec3f(&sp->store[i].pos, &p.phit));
if (sp->store[i].nature == AREA_LIGHT)
trans = soft_shadows(p, ray, sp, i);
else
trans = sharp_shadows(p, ray, sp, light_dir);
tmp = phong_shading(trans, ray, p, light_dir, sp->store[i].ecolor);
scolor = add_vec3f(&scolor, &tmp);
}
i++;
}
return (add_vec3f(&scolor, &p.sphere->ecolor));
}
static inline t_color recursive_tracer(t_params p, t_ray *ray, t_objects *sp)
{
t_f64 inside;
t_f64 facingratio;
t_f64 fresneleffect;
t_vec3f refldir;
t_vec3f refdir;
t_color reflection;
t_color refrac;
t_ray rx;
if ((inside = dot_vec3f(&ray->dir, &p.nhit) > 0))
p.nhit = scale_vec3f(&p.nhit, -1);
facingratio = -dot_vec3f(&ray->dir, &p.nhit);
fresneleffect = mix(pow(1 - facingratio, 3), 1, .1);
refldir = get_reflection_dir(&p.nhit, &ray->dir);
rx = reflected_ray(ray, &refldir, &p.nhit, &p.phit);
reflection = trace_ray(&rx, sp, ++p.depth);
if (p.sphere->transparency > 0)
{
refdir = compute_ideal_refractions(ray, inside, p);
rx = refracted_ray(ray, &refdir, &p.nhit, &p.phit);
refrac = trace_ray(&rx, sp, ++p.depth);
}
return (defualt_glossy_shading(&reflection,
&refrac, fresneleffect, p.sphere));
}
t_bool plane_intersection(t_ray *r, t_sphere *s, t_f64 *t0, t_f64 *t1)
{
t_f64 denom;
t_vec3f v_n;
t_vec3f c;
t_vec3f f;
v_n = normal_vec3f(&s->pos);
denom = dot_vec3f(&v_n, &r->dir);
if (denom > 1e-6)
{
f = sub_vec3f(&s->pos, &r->origin);
*t1 = dot_vec3f(&f, &v_n) / denom;
*t0 = *t1;
c = scale_vec3f(&r->dir, *t0);
c = add_vec3f(&c, &r->origin);
if (!((c.x > s->pos.x) && (c.x < (s->pos.x + 10))))
return (FALSE);
if (!((c.y > s->pos.y) && (c.y < (s->pos.y + 10))))
return (FALSE);
if (!((c.x > s->pos.z) && (c.y < (s->pos.y + 10))))
return (FALSE);
return (*t0 >= 0);
}
return (FALSE);
}
t_vec3f trace_ray(t_ray *ray, t_objects *sp, int depth)
{
t_params param;
param = get_closest_primitive(ray, sp);
param.depth = depth;
if (param.sphere == NULL)
return (new_uni_color(3));
param.phit = scale_vec3f(&ray->dir, param.tnear);
param.phit = add_vec3f(&ray->origin, ¶m.phit);
param.nhit = param.sphere->normal(¶m.phit, ¶m.sphere->pos,
param.sphere->inverse_matrix);
param.ray = ray;
if ((param.sphere)->reflection > 0 && depth < MAX_RAY_DEPTH)
return (recursive_tracer(param, ray, sp));
return (single_tracer(param, ray, sp));
}
static inline t_color sharp_shadows(t_params p,
t_ray *r, t_objects *s, t_vec3f ld)
{
t_f64 t0;
int i;
t_ray sray;
i = 0;
while (i < s->top)
{
if (s->store[i].type != LIGHT)
{
sray = dup_ray(r);
sray.origin = scale_vec3f(&p.nhit, BIAS);
sray.origin = add_vec3f(&sray.origin, &p.phit);
sray.dir = ld;
if (s->store[i].intersect(&sray, &s->store[i], &t0, &t0))
return (new_uni_color(0));
}
i++;
}
return (new_uni_color(1));
}
