Surface3D.project returns nulls when points are outside bounding box

[Jacoby6000]

An exception or something should be thrown here... Otherwise everything that ever manages the lists of Point3D produced will have to do error checking on the nulls. Not throwing an error here also leads to confusing stack traces where you have to track down where the null point was generated, or just decide to code a case to ignore null points.

[Jacoby6000]

If nulls are an expected and desired result, then perhaps we should use an optional type instead of a null value.