[V8i C# / VBA] - generating connections between points

Hello

I am trying to create a macro which should generate connection between 2 points in 3D. The biggest issue is that line has to use only 90° angles.

To be precisely understood - the lines must be delineated only at XYZ coordinates at 90 °.

Any ideas how to implement this crucial issue?

Thanks a lot for any answers. :)