/// <summary>
/// Determines whether a given ray intersects with any scene objects (other than excludedObject)
/// </summary>
/// <param name="ray">The ray to test</param>
/// <param name="scene">The scene to test</param>
/// <param name="excludedObject">An object that is not tested for intersections</param>
/// <param name="intersection">If the intersection test succeeds, contains the closest intersection</param>
/// <returns>A value indicating whether or not any scene object intersected with the ray</returns>
private bool TryCalculateIntersection(Ray ray, Scene scene, DrawableSceneObject excludedObject, out Intersection intersection)
{
var closestDistance = float.PositiveInfinity;
var closestIntersection = new Intersection();
foreach (var sceneObject in scene.DrawableObjects)
{
Intersection i;
if (sceneObject != excludedObject && sceneObject.TryCalculateIntersection(ray, out i))
{
if (i.Distance < closestDistance)
{
closestDistance = i.Distance;
closestIntersection = i;
}
}
}
if (closestDistance == float.PositiveInfinity)
{
intersection = new Intersection();
return(false);
}
else
{
intersection = closestIntersection;
return(true);
}
}
/// <summary>
/// Constructs an intersection
/// </summary>
/// <param name="point">The point at which the intersection occurred</param>
/// <param name="normal">The normal direction at which the intersection occurred</param>
/// <param name="impactDirection">The direction the ray was traveling on impact</param>
/// <param name="obj">The object that was intersected</param>
/// <param name="color">The object's raw color at the intersection point</param>
/// <param name="distance">The distance from the ray's origin that the intersection occurred</param>
public Intersection(Vector3 point, Vector3 normal, Vector3 impactDirection, DrawableSceneObject obj, Color color, float distance)
{
this.Point = point;
this.Normal = normal;
this.ImpactDirection = impactDirection;
this.ObjectHit = obj;
this.Color = color;
this.Distance = distance;
}
