public Camera(Vector pos, Vector lookAt)
{
this.pos = pos;
var down = new Vector(0.0, -1.0, 0.0);
this.forward = Vector.norm(Vector.minus(lookAt, pos));
this.right = Vector.times(1.5, Vector.norm(Vector.cross(this.forward, down)));
this.up = Vector.times(1.5, Vector.norm(Vector.cross(this.forward, this.right)));
}
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))));
}
}
Vector getPoint(double x, double y, Camera camera)
{
return(Vector.norm(Vector.plus(camera.forward, Vector.plus(Vector.times(recenterX(x), camera.right), Vector.times(recenterY(y), camera.up)))));
}
public override Vector normal(Vector pos)
{
return(Vector.norm(Vector.minus(pos, this.center)));
}