// add diffuse and ambient lighting
public void add_das(Vec3 normal, Geometry o, Vec3 light)
{
int s = 64; // the size of the specular lighting
// diffuse and ambient factor = surface N * light N
normal.normalize();
double theta = normal.dot(light);
if (theta < 0.0)
{
theta = 0.0;
}
ret_color.diffuse_ambient(theta);
// blinn phon specular model
Vec3 eyeN = Program.proj.eye.get_normalized();
Vec3 h = eyeN.add(light);
h.normalize();
double b = Math.Max(normal.dot(h), 0.0); // TODO add a shiny/diffuse factor for the object
double amount = Math.Pow(b, s);
ret_color.specular(amount, Program.scene.ls, o.shininess);
}
public void calc_uvw()
{
w = eye.subtract(point_at);
w.normalize();
u = up.crossProduct(w);
u.normalize();
// right handed coordinate system
v = w.crossProduct(u);
v.normalize();
v.negate();
}
public void add_reflection(Vec3 hit_point, Geometry o, int recursion_level)
{
Vec3 n = o.get_surface_n(hit_point);
// reflection = 2(n ยท v)n - v
Vec3 r_dir = n.scale((2 * n.dot(Program.proj.eye))).subtract(Program.proj.eye);
r_dir.normalize();
Ray reflection = new Ray(hit_point, r_dir);
reflection.prev_hit_id = o.get_id();
//System.out.println("Level: " + recursion_level);
bool r_hit = reflection.trace(recursion_level + 1);
if (r_hit)
{
// add in reflection
reflection.ret_color.scalar_update(o.reflectiveness);
this.ret_color.add_reflection(reflection.ret_color);
}
}
