public static bool IsPointOnRay(HPoint p, HRay ray)
{
if (!HAccuracy.DoubleEqual(0, ((p - ray.Source) * (ray.Direction)).Length())) //is not on line(colinear)
{
return(false);
}
return(HAccuracy.DoubleGreater((p - ray.Source) % (ray.Direction), 0)); //is codirectional
}
public Color TraceRay(HRay ray)
{
var collisions = new List <KeyValuePair <HPoint, ICollider> >();
foreach (ICollider collider in Colliders)
{
HPoint collisionPoint = collider.CollisionPoint(ray);
if (collisionPoint != null)
{
collisions.Add(new KeyValuePair <HPoint, ICollider>(collisionPoint, collider));
}
}
collisions.Sort(
(KeyValuePair <HPoint, ICollider> a, KeyValuePair <HPoint, ICollider> b) =>
(ray.Source - a.Key).Length().CompareTo((ray.Source - b.Key).Length()));
return(collisions.Count == 0 ? Color.White : collisions[0].Value.ProcessCollision(this, collisions[0].Value, ray));
}
public HPoint CollisionPoint(HRay ray)
{
HPoint intersectionPoint = HGeometry.OldIntersectPlaneLine(A, B, C, ray.Source, ray.Source + ray.Direction);
if (intersectionPoint == null) //no intersection point with plane
{
return(null);
}
if (!HGeometry.IsPointOnRay(intersectionPoint, ray)) //point is invisible
{
return(null);
}
double firstSquare = HGeometry.TriangleSquare(A, B, C);
double secondSquare = HGeometry.TriangleSquare(A, B, intersectionPoint) +
HGeometry.TriangleSquare(A, C, intersectionPoint) +
HGeometry.TriangleSquare(C, B, intersectionPoint);
return(HAccuracy.DoubleEqual(firstSquare, secondSquare) ? intersectionPoint : null);
}
public HPoint CollisionNormal(HRay ray)
{
throw new System.NotImplementedException();
}
public Color ProcessCollision(HRender render, ICollider collider, HRay ray)
{
return(Shader(render, collider, ray));
}
public Color ProcessCollision(HRender render, ICollider collider, HRay ray)
{
throw new NotImplementedException();
}
public HPoint CollisionPoint(HRay ray)
{
throw new NotImplementedException();
}
public static Color SimpleRedShader(HRender render, ICollider collider, HRay ray)
{
return(Color.Red);
}
public static Color SimpleBlackShader(HRender render, ICollider collider, HRay ray)
{
return(Color.Black);
}