public static Vector norm(Vector v)
{
var mag = Vector.mag(v);
var div = (mag == 0) ? double.PositiveInfinity : 1.0 / mag;
return(Vector.times(div, v));
}
Color addLight(Color col, Light light)
{
var ldis = Vector.minus(light.pos, pos);
var livec = Vector.norm(ldis);
var neatIsect = this.testRay(new Ray(pos, livec), scene);
var isInShadow = (neatIsect == null) ? false : (neatIsect <= Vector.mag(ldis));
if (isInShadow)
{
return(col);
}
else
{
var illum = Vector.dot(livec, norm);
var lcolor = (illum > 0) ? Color.scale(illum, light.color)
: Color.defaultColor;
var specular = Vector.dot(livec, Vector.norm(rd));
var scolor = (specular > 0) ? Color.scale(Math.Pow(specular, thing.surface.roughness), light.color)
: Color.defaultColor;
return(Color.plus(col, Color.plus(Color.times(thing.surface.diffuse(pos), lcolor),
Color.times(thing.surface.specular(pos), scolor))));
}
}