Hi, is there a way to make surface thicken more robust. I thicken slightly for direct shaping but the top surface fails a lot, which the the topo below copied up, then a solid at the top to get the right area intersects it top chop the area I want. Not sure if theres a way to simplify or make the poly surface easier to use for thickening? @Ewan_Opie 
I dont direct shape the surface cause it looks terrible in Revit
Feel like dynamos turning me into a wacko again. The solid that intersected the surface area I wanted above. I cut that twice with the offset topo surface to get a slither…..
Hey, good to hear from you.
Is that a trench in the topography element?
There is already another way of doing things, but can you detail what your workflow is trying to achieve, inputs, expected output, purpose. Glad to help if I can. Also what version of Revit, because that can give some benefits when dealing with geometry.
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