public RayIntersection FindFirstIntersection(Ray ray)
{
IList<RayIntersection> intersections = new List<RayIntersection>();
foreach (IRenderObject o in renderables)
{
RayIntersection intersection = o.FindFirstIntersection(ray);
if (intersection != null)
{
intersections.Add(intersection);
}
}
RayIntersection closestIntersection = null;
float minDistance = float.MaxValue;
foreach (RayIntersection ri in intersections)
{
float distance = Vector3f.Distance(ri.Position, ray.Start);
if (distance < minDistance)
{
minDistance = distance;
closestIntersection = ri;
}
}
return closestIntersection;
}
public RenderData CastEyeRay(Ray ray, Scene scene)
{
RayLifetimeManager rayManager = new RayLifetimeManager(ray, scene, renderModel);
RenderData rayCastResult = rayManager.DoRayCast();
if (rayCastResult == null)
{
return new RenderData(new Color(0, 0, 0));
}
return rayCastResult;
}
public RayIntersection FindFirstIntersection(Ray ray)
{
Vector3f dist = ray.Start - position;
float a = ray.Direction * ray.Direction;
float b = 2.0f * (dist * ray.Direction);
float c = (dist * dist) - (radius * radius);
float d = b * b - (4.0f * a * c); //Discrimant of quadraditic equation
if (d < 0.0f)
{
return null; //No collision
}
float t = (-b - d) / (2 * a);
Vector3f collision = (t * ray.Direction) + ray.Start;
return new RayIntersection(ray, this, collision, (ray.Start), materialData);
}
