Hi 👋
I'm trying to model a Y split ellipse profiled object, and while this thread helped, I'm now facing a similar problem with a slightly different situation. I must be missing guide rails to avoid tolerance issues I guess for the mirror join to work.
Patches are going nuts, though it was working perfect for the other method. I want a flat patch between extruded surfaces.
Interested to see how one of you can figure this one out !
Best wishes,
There aren't surface edge to join. There are only point connections.
Also, the way you designed this geometry I wonder how you imagine for a loft, or patch to connect the different parts.
See if this is what you desire. I stitched it together into a solid at the end, you can remove this is you want surfaces only. Model attached.
John Hackney, Retired
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Thanks for the answer ! I'm still not able to patch the gap though.
I must be modelling this incorrectly. Here's a working version that I slightly modified and shows better what I want to do, but it's still not looking as I would expect it to. The red line shows what I would expect:
Did you look at the timeline in my supplied model? For the surfaces you indicate, I did not use the Patch command, I used Surface Sweep with Guide Rails. I did use Patch to finish off the ends and make a solid. Go back and take a look.
John Hackney, Retired
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I mentioned in the other thread that the patch was already approaching problematic because of the way the patch edges come together at those tight angles, and that techniques could be improved as design intent becomes clearer. to get these patches to work better, you could split and loft your ellipses differently to open up the corners a bit. split them like this-
and just loft then either end together, then draw a spline here-
extrude it into a surface so yo can use the edge for a patch. now you will have a 5 sided patch with less problematic corners.
I'd actually approach this differently. If you first create the half-elliptical lofts, you'll have to use the patch command to fill in the triangular area.
If you model the triangular sections first, they can be trimmed NURBS and have much better properties.
then you can use their edges to guide the elliptical lofts and and up in general with a much better model.
Currently the elliptical lofts are deforming as there is only one rail to guide them.
Good luck! I've looked too far down a bottle of Pinot Grigio to try that tonight 🙂
