I have some 3D solids (cylinders) that are sloping and running horizontally representing pipes in a trench with their World Z values at 1% grade. I need to get the invert depth of the pipe (bottom) at any arbitrary picked location. I have found no way to snap to any geometry except for a construction line in the center. Does anyone know of a way that I can find the invert elevation without having to select the construction line? I've tried everything I know. Thanks, Don