Can the geometry engine in 4.7 intersect a 3d line with a 3d polygon?

[RichardHughes2]

When using the geometry engine's intersect method and inputting a line geometry with z-values and a polygon with z-values, the result keeps returning a geometry identical to the input line.  

Is this a supported operation by the api?  While 3d is supported I cannot seem to find documentation on using the Geometry Engine with 3d features.

[RichardHughes2]

Just after reading through the snippet it looks like that it what we are thinking of.  Thanks for your help getting it going in the app.  If I find enough time to put towards writing the equations in javascript, I'd love to be able to calculate the intersection myself, but my Calc and Trig are rusty.