public Camera(Vector Position, Vector Taget)
{
Vector forward = Taget - Position;
forward.Normalize();
Vector down = new Vector(0, -1, 0);
Vector right = Vector.Corss(ref forward, ref down);
right.Normalize();
right *= 2;
Vector up = Vector.Corss(ref forward, ref right);
up.Normalize();
up *= 1.5f;
this.Position = Position;
this.Direction = forward;
this.Y = up;
this.X = right;
}
private Color GetNaturalColor(Shape thing, ref Vector pos, ref Vector norm, ref Vector rd, Scene scene)
{
rd.Normalize();
Color ret = Color.Black;
var ray = new Ray();
ray.Position = pos;
for (int i = 0; i < scene.Lights.Length; i++)
{
Light light = scene.Lights[i];
Vector ldis = light.Pos - pos;
var len = ldis.Length;
Vector livec = ldis * (1f / len);
ray.Direction = livec;
if (!scene.ShaowTest(ref ray, len))
{
float illum = livec * norm;
if (illum > 0)
{
var lcolor = light.Color;
lcolor.Multiply(illum);
lcolor.Multiply(thing.Surface.Diffuse(pos));
ret.Add(ref lcolor);
}
float specular = livec * rd;
if (specular > 0)
{
var scolor = light.Color;
scolor.Multiply((float)Math.Pow(specular, thing.Surface.Power));
scolor.Multiply(thing.Surface.Specular(pos));
ret.Add(ref scolor);
}
}
}
return(ret);
}
public override Vector GetNormal(Vector pos)
{
pos -= Center;
pos.Normalize();
return(pos);
}