Dear Everybody
several times i come across similar issues like the one (a reduced / simplyfied version) you find attached. how to fill the hole between the surfaces with a G2 surface / surface combination?
In the .3dm file you will find a t-spline - solution.
rhino patch fails.
i managed to get some acceptable but painful solutions with some of the blend commands.
How about something like this: G2handle.3dm (296.8 KB)
Personally, I think one could make a lot nicer looking model (and more robust model too) if G1 transitions were used.
. Making G2 transitions between a bunch of planar surfaces seems silly, but that’s just my opinion.
I notice the Tsplines version doesn’t come close to matching the input curves and some surfaces don’t match.
@pascal@jim
thanks a lot for your suggestions.
I hoped that there could be a solution with a topology similar to the t-spline sketch ( wich i just include to show roughly what i am searching.)
(@) jim:
i agree that g1 vs g2 can be discussed - but the problem is more an extract / reduced version of a larger context - with curved surfaces.
I don’t think you are going to find an acceptable looking Class-A solution to this form. I had to use another Cad modeler to do the 5 sided patches. Rhino’s patch command just can’t handle them. It’s not perfect but it produces a clean flowing form. I would modify the topology to get a clean result. Without the need for complex trim surfaces or n-side patches. Hopefully this will spark someone to come up with something better.
this is the solution i will finally use - the pity is, that it is not a bush of one / a few buttons - solution.
i started with a _sweep1 (simple sweep) for the main surface and then stepwise added more Knots and moved the CVs…
Gave it some more thought and came up this better simpler result. I tried to do a cordial/constant width fillet/blend. The results looked a little wonky as it went over the accelerated blend surfaces. I decided it looked better with a rolling ball style.
I got this one, by starting diagonally from the red corners, and BlendCrv/Isocurves (Tangent) which I pulled out a bit in the lower end (arrow head). Finished off with MatchSrf.
But I noticed one thing which I don’t understand how it is configured. I tried to show isocurves, but I found no way to display them, not in any display mode. What is the magic behind that?
My model is in the same location and orientation as the original.
If the view angle and cplane orientation has some relevance to the problem posed I would appreciate if somebody would explain that relevance so that I might avoid whatever problem my failure to understand the relevance is causing.
