/// <summary>
/// Test if a sphere intersects at least one plane in in the frustum.
/// </summary>
/// <returns>true when the sphere intersects.</returns>
internal bool IntersectsOne(BoundingSphere c)
{
foreach (Plane2d p in this.planes)
{
double distancePlaneToPoint = p.A * c.Center.X + p.B * c.Center.Y + p.C * c.Center.Z + p.D;
if (distancePlaneToPoint * distancePlaneToPoint > -c.RadiusSq)
// 1 radius inside the plane = outside
return true;
}
//else it's in view
return false;
}
/// <summary>
/// Test if a sphere intersects or is completely inside the frustum.
/// </summary>
/// <returns>true when the sphere intersects.</returns>
public bool Intersects(BoundingSphere c)
{
foreach(Plane p in this.planes)
{
float distancePlaneToPoint = p.A * c.Center.X + p.B * c.Center.Y + p.C * c.Center.Z + p.D;
if(distancePlaneToPoint < -c.Radius)
// More than 1 radius outside the plane = outside
return false;
}
//else it's in view
return true;
}