Hi Max, I think that Rhino's one is based on intersecting curves with one another, while MoI's one is based on following a curve and using a pixel depth buffer to determine whether things are hidden or not.

So yeah they use a different approach and that's part of why they have different abilities too, like Rhino's one does not have any method for generating an outline or silhouette lines out to AI or PDF format like MoI's does.

I think it could be possible for me to increase the accuracy of MoI's one in the future, by incorporating some more detailed analysis of things when a curve is entering or exiting from the hidden state.

- Michael