private IntersectionObject intersectSphere(Ray ray)
{
if (!parameters.ContainsKey("radius"))
{
throw new Exception("Key radius is absent for sphere object");
}
IntersectionObject interObject = new IntersectionObject();
var radius = parameters["radius"];
var a = 1;
var b = 2 * Vector3.dot(ray.direction, ray.origin - position);
var c = (ray.origin - position).getNormSquare() - (radius * radius);
var delta = b * b - 4 * a * c;
if (delta < 0)
{
return(interObject);
}
var t1 = (-b - Math.Sqrt(delta)) / (2 * a);
var t2 = (-b + Math.Sqrt(delta)) / (2 * a);
if (t2 < 0)
{
return(interObject);
}
interObject.ray = ray;
interObject.obj = this;
interObject.hasIntersection = true;
interObject.distance = t1 > 0 ? t1 : t2;
interObject.intersectionPoint = ray.origin + ray.direction * interObject.distance;
interObject.iPointNormal = (interObject.intersectionPoint - position).normalized();
return(interObject);
}
private IntersectionObject intersectPlane(Ray ray)
{
if (!parameters.ContainsKey("normaleX"))
{
throw new Exception("Key normaleX is absent for plane object");
}
if (!parameters.ContainsKey("normaleY"))
{
throw new Exception("Key normaleY is absent for plane object");
}
if (!parameters.ContainsKey("normaleZ"))
{
throw new Exception("Key normaleZ is absent for plane object");
}
IntersectionObject interObject = new IntersectionObject();
Vector3 planNormal = new Vector3(parameters["normaleX"], parameters["normaleY"], parameters["normaleZ"]);
var denom = planNormal.dot(ray.direction);
double t;
if (denom == 0)
{
return(interObject);
}
t = (-(planNormal.dot(ray.origin - position))) / denom;
if (t < 0)
{
return(interObject);
}
interObject.hasIntersection = true;
interObject.intersectionPoint = ray.origin + ray.direction * t;
if (denom < 0)
{
interObject.iPointNormal = planNormal;
}
else
{
interObject.iPointNormal = -planNormal;
}
interObject.obj = this;
interObject.ray = ray;
return(interObject);
}
public MyColorClass getLighAt(IntersectionObject intersectionObject, double _distance, bool shadow)
{
var lightVector = intersectionObject.intersectionPoint - position;
lightVector.normalize();
var angle = intersectionObject.iPointNormal.dot(-lightVector);
if (angle <= 0)
{
return(new MyColorClass());
}
var newDistance = Math.Round(_distance / distance, 4);
var finalColor = intersectionObject.obj.material.diffuseColor * angle * intensity * color - newDistance;
if (shadow)
{
return(intersectionObject.obj.material.diffuseColor * angle * color * angle);
}
return(finalColor);
}
