rgb lighting(scene s, ray r, hit_test h)
{
rgb result;
if (h.miss)
return s.bg;
vec hit_position = ray_position(r, h.dist);
if (shadow(hit_position, s.light, s.spheres)) {
result = rgb_modulate(h.surf, s.amb);
}
else {
double dot = vec_dot(h.surf_norm, s.light.direction);
double d = double_max(0, dot);
rgb diffuse_light = rgb_scale(d, s.light.color);
rgb lsum = rgb_add(s.amb, diffuse_light);
result = rgb_modulate(h.surf, lsum);
}
/**** === implement specular reflection here === ****/
if (rgb_nonzero(h.shine)) {
rgb ss;
vec N = h.surf_norm;
vec L = s.light.direction;
rgb S = h.shine;
vec R = vec_sub( vec_scale(2* vec_dot(N,L),N),L);
vec V = vec_neg(r.direction);
if (vec_dot(N,L)>0){
ss = rgb_scale( pow( double_max( vec_dot(R,V),0), 6), S);
//rgb_print(k);
}
else
ss = rgb_expr(0,0,0);
return rgb_add(result,ss);
}
return result;
}
static void set_color_max(t_phpa *ph)
{
rgb_add(ph->color, ph->diffuse->r, ph->diffuse->g, ph->diffuse->b);
rgb_add(ph->color, ph->specular->r, ph->specular->g, ph->specular->b);
rgb_clamp(ph->color);
}