static double normalize_v( double *a )
{
double const k = 1./length_v(a);
a[0] *= k;
a[1] *= k;
a[2] *= k;
}
void normalise_v(Vertex &v) {
GLdouble length = length_v(v);
if (length==0) { length = 1; }
v.x/=length;
v.y/=length;
v.z/=length;
};
t_surface *is_in_light(t_surface *surface, t_scene *scene,
t_light *light, double *dot_light)
{
t_vector light_ray;
t_double3 light_distance;
t_surface *light_intersect;
double dot_light_dir;
light_ray.pos = surface->point;
light_distance = v_minus_v(light->pos, surface->point);
light_ray.dir = normalize(light_distance);
*dot_light = dot_product(light_ray.dir, surface->normal);
*dot_light = max_double(0, *dot_light);
if (length_v(light->dir) > 0.01)
{
dot_light_dir = abs_double(dot_product(light_ray.dir, normalize(light->dir)));
dot_light_dir = max_double(0, dot_light_dir);
*dot_light *= dot_light_dir;
}
light_intersect = intersect(light_ray, scene, surface->object);
if (light_intersect->object != NULL)
light_intersect->distance -= length_v(light_distance);
return (light_intersect);
}
t_double3 direct_light(t_vector ray, t_scene *scene,
t_double3 color_hit)
{
t_light *light;
t_double3 light_vector;
t_surface *light_intersect;
double dot_light;
light = scene->light;
while (light)
{
light_vector = v_minus_v(light->pos, ray.pos);
dot_light = dot_product(normalize(light_vector), ray.dir);
dot_light = max_double(0, exp(dot_light + 7.51745) -5000);
light_intersect = intersect((t_vector){scene->camera.pos,
normalize(light_vector)}, scene, NULL);
if (light_intersect->object == NULL || (light_intersect->distance >
length_v(light_vector)))
color_hit = color_mix(light->color, dot_light, color_hit);
free(light_intersect);
light = light->next;
}
return (color_hit);
}
