The fix for RT-9504 created some general methods for creating and projecting pick rays to support the work to project clip rectangles in Decora. These methods were based on the 3D event code in PrismScene, but modified to be independent of a Scene object. The 3D event code in PrismScene should be modified to use these new methods to share more code. (Also, the new methods require a lot less data copying and transform inversions on each operation so they should prove more efficient in any case).