Thanks but yes I thought I might have chosen a poor example as I agree it is easy to just trim this shape from the side but Michael is right I was refering to this type of situation that would work whatever the shape, so it would work in situations where you couldn't get an exact side elevation to trim along as is often the case with roads/terrain layouts. N sided Patch sounds like the answer, any ideas on when this might emerge? Is it a V3 thing or a V4 thing?

Cheers