private Color getNaturalColor(Object3D thing, Vector3 pos, Vector3 norm, Vector3 rd, Scene scene)
{
List<Color> colors = new List<Color>();
foreach (var light in scene.lights)
{
var ldis = light.pos - pos;
var livec = Vector3.Normalize(ldis);
var neatIsect = this.testRay(new Ray { Position = pos, Direction = livec }, scene);
var isInShadow = (neatIsect == null) ? false : neatIsect.Value <= ldis.Length();
if (isInShadow)
{
colors.Add(Color.defaultColor);
}
else
{
var illum = Vector3.Dot(livec, norm);
var lcolor = (illum > 0) ? Color.scale(illum, light.color) : Color.defaultColor;
var specular = Vector3.Dot(livec, Vector3.Normalize(rd));
var scolor = (specular > 0) ? Color.scale((float)System.Math.Pow(specular, thing.surface.roughness), light.color) : Color.defaultColor;
var outc = Color.plus(Color.defaultColor, Color.plus(Color.times(thing.surface.diffuse(pos), lcolor), Color.times(thing.surface.specular(pos), scolor)));
colors.Add(outc);
}
}
var cl = new Color(0, 0, 0);
foreach (var c in colors)
{
cl.r += c.r;
cl.g += c.g;
cl.b += c.b;
}
return cl;
}
