/// <summary>
/// Ray/PlaneBoundedVolume intersection test.
/// </summary>
/// <param name="ray"></param>
/// <param name="volume"></param>
/// <returns>Struct that contains a bool (hit?) and distance.</returns>
public static IntersectResult Intersects(Ray ray, PlaneBoundedVolume volume)
{
List <Plane> planes = volume.planes;
float maxExtDist = 0.0f;
float minIntDist = float.PositiveInfinity;
float dist, denom, nom;
for (int i = 0; i < planes.Count; i++)
{
Plane plane = planes[i];
denom = plane.Normal.Dot(ray.Direction);
if (MathUtil.Abs(denom) < float.Epsilon)
{
// Parallel
if (plane.GetSide(ray.Origin) == volume.outside)
{
return(new IntersectResult(false, 0));
}
continue;
}
nom = plane.Normal.Dot(ray.Origin) + plane.D;
dist = -(nom / denom);
if (volume.outside == PlaneSide.Negative)
{
nom = -nom;
}
if (dist > 0.0f)
{
if (nom > 0.0f)
{
if (maxExtDist < dist)
{
maxExtDist = dist;
}
}
else
{
if (minIntDist > dist)
{
minIntDist = dist;
}
}
}
else
{
//Ray points away from plane
if (volume.outside == PlaneSide.Negative)
{
denom = -denom;
}
if (denom > 0.0f)
{
return(new IntersectResult(false, 0));
}
}
}
if (maxExtDist > minIntDist)
{
return(new IntersectResult(false, 0));
}
return(new IntersectResult(true, maxExtDist));
}
/// <summary>
/// Tests whether this ray intersects the given PlaneBoundedVolume.
/// </summary>
/// <param name="volume"></param>
/// <returns>
/// Struct containing info on whether there was a hit, and the distance from the
/// origin of this ray where the intersect happened.
/// </returns>
public IntersectResult Intersects(PlaneBoundedVolume volume)
{
return(MathUtil.Intersects(this, volume));
}