public static Couleur Color_Diffused(Light_Source light, Couleur px_color, V3 P, V3 N)
{
V3 L = -light.direction;
if (light.point_light)
{
L = light.position - P;
//L = P-light.position;
L.Normalize();
}
float cos_theta = N * L;
if (cos_theta < 0)
{
cos_theta = 0;
}
float on_shadow = getShadow(P, light);
Couleur c = cos_theta * (light.color * px_color);
return(c * on_shadow);
}
public static Couleur Color_Specular(Light_Source light, V3 P, V3 N, int k)
{
V3 L = -light.direction;
if (light.point_light)
{
L = light.position - P;
L.Normalize();
}
float cos_alpha = (N * L);
if (light.point_light && cos_alpha < 0)
{
cos_alpha = -cos_alpha;
}
V3 R = (N * 2 * cos_alpha) - L;
R.Normalize();
V3 D = Elements.camera_position - P;
D.Normalize();
float f = (R * D);
if (f < 0)
{
f = 0; // if cos is negative there won't be any specularity
}
Couleur c = (float)Math.Pow(f, k) * (light.color);
return(c);
}
public static float getShadow(V3 P, Light_Source light)
{
float t, t_max = 200;
V3 direction = -light.direction;
if (light.point_light)
{
direction = light.position - P;
direction.Normalize();
}
foreach (Object obj in Elements.objects_on_screen)
{
obj.intersection_RayObject(P, direction, out V3 P1, out V3 N1, out t);
if (t > MIN_DISTANCE && t < t_max)
{
if (-direction * N1 > 0.1f)
{
return(0.3f);
}
}
}
return(1);
}
public static void add_light(V3 position, Couleur c, bool point)
{
Light_Source l = new Light_Source(position, c, true);
lights.Add(l);
}
public static void add_light(V3 direction, Couleur c)
{
Light_Source l = new Light_Source(direction, c);
lights.Add(l);
}
