but it's a pretty clever way.
Btw, another way would be to construct the top and bottom points and then use the loft tool.
I was actually inspired by ulrich1a, who uses construction geometry in sketches in a much cleverer way than I. His geodesic pentagon
I didn't even think of using the Part Loft tool! A Draft Rectangle and a Draft Point would be all that would be needed to make a pyramid, then mirror it.
Robocut wrote:Can this be done such that changing a parameter will cause it to update correctly?
No, you would need to manually change the Z height of the point, and that would require you to calculate its correct Z coordinate.
With my method, you don't need to.
bejant wrote: guess you can see the answer is usually not to do the calculations unless you have to - let FreeCAD do them for you instead.
I wholeheartedly agree with that! I hate having to get the calculator.