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I am trying to create a 3D surface from three lines - one border profile (green) and two intersecting u,v lines (cyan and yellow) (see screenshot below). Does anyone have an idea how to achieve this? I have attached a dwg with the 3 lines.
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Another method would be to generate intermediate Ellipses, then loft all of those to a central point.
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I like the "intermedia ellpises" method a lot because the end geometry is very clean and simple. Just one question, when you are finishing the loft command, what option do you choose from the list below:
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I used Cross Sections Only. That happens to be the default, so a user can just hit 'Enter'.
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Its interesting that when I execute the loft command I get a "Surface (Loft)" as and end result and in your example file the result was "Surface (Nurbs)". Did you do anything else with the surface after the loft command?
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Leaving it as a "Loft" would allow for cross section modification at some later date, if the need should arise. Converting to NURBS, especially if the surface is rebuilt to a lower Control Point density, reduces the data footprint to the file.
Doing one or the other sort of depends on what the eventual plan is for the geometry.
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May your cursor always snap to the location intended.