# Steve Barnhart

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1. ## Import Surfaces - not enough Knots

I have some surface geometry that was exported from PolyWorks in IGES format. When I import it into Evolve, it seems that knots are only being mapped to a small portion of the overall surface. Is there a way to control the knots extent or do I need to somehow split these up?
2. ## Surface Continuity - A Comparison

Thanks again Arjun. The surfaces are much closer with that method and it also eliminated the surface artifact I had observed. I understand that the arc length profiles and arc length rails options control how evenly the isoparms are spaced, but could you explain what this means? Is it an alternate set of constraints or a secondary solution for the NURBS calculations? Thanks!
3. ## Surface Continuity - A Comparison

Thanks Antonio - that does help clarify. For these three curves I would, of course, most easily get a nice surface by including all three. I'm trying to understand what will happen when I start adding additional curves to represent what will become a significantly more complex shape and if the loft tool is the best method to move forward. It's helpful to see that there's a difference between internal continuity of a surface and one applied after the fact by adjusting the edge constraint.
4. ## Surface Continuity - A Comparison

Thanks Arjun. It is attached. 2017-03-28_Test_Model.evo
5. ## Surface Curvature Range - Units?

Thanks Arjun!
6. ## Surface Problem

I think you want to add knots using the NURBS surface editing interface. Select the surface and switch to 'edit parameters' mode. That will list the existing knots and allow you to insert new knots. To insert one or more knots evenly spaced between existing, ctrl-pick the adjacent knots in the list, enter the number of new knots desired, and click on 'refine'. You can also remove individual knots and insert at specific locations (0 to 1) along the U and V direction of the surface. Does that help? example2_edit_v1.evo
7. ## Surface Problem

Greg, I'm pretty sure this isn't quite the result you're looking for, but maybe will give you an idea. I split the inner surface and applied a couple blend surfaces between inner and outer. The transitions need to be patched in. Could you post a version of the glasses with the surface still intact (nosepads not formed) so I can see what you're aiming for? example_edit_v1.evo
8. ## Surface Continuity - A Comparison

I also noticed a drastic increase in hull lines when adjusting to G2 continuity. Is that typical? Positional surface constraint: G1 Tangential surface constraint: G2 Curvature surface constraint:
9. ## Surface Continuity - A Comparison

Can anyone explain to me why these two loft methods result in different surface geometry? 1. Loft curve 1 to curve 2 (with rails), Loft edge to curve 3 (same rails), adjust continuity to g2. 2. Loft curve 1 through curve 2 to curve 3 (with rails) Resulting geometry is similar, but not quite. It looks like the second method allows the isoparms to be evenly spaced across the entire surface, and therefore smoother overall. Also notice the strange artifact on the left-hand side of method one.
10. ## Surface Curvature Range - Units?

In the surface curvature interface, the min and max range can be specified. What units are used? Is it radians/unit or something else? Also - can the color scale be modified?
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