MatchSrf moves control points too much

Rhino
1

Green is the original surface, red is the MatchSrf result:

image
image1038×802 111 KB

I don’t see why the control points needed to move in any other direction than the normal direction here, but unfortunately there’s no option to restrict this?

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2

hard to tell what is going on from an image and not knowing how you have your options set, but I’m quite sure something similar was reported by at least @sgreenawalt and logged

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3

maybe check if the edges have kinks or aren’t merged?

also maybe check the closest or nearest point option?

if using curves maybe check composition of those curves…

4

Sub optimal MatchSrf behavior like this is so far down the stack of stuff that should be massaged/fixed, I would not expect it to ever be addressed. However, your surfaces are not over-defined to the point that you can’t simply manually adjust your verts in U/V to achieve the desired point distribution. It’s 10-20X faster to do this with the Cyberstrak Control Point Editing tool than MoveUVN, so that would be my suggestion.

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5

Cyberstrak is definitely far faster to do these actions. Unfortunately, MatchSrf is a great function that does great matching, but seemingly seems to have a Joker function that randomly makes the surface maximum entropy, by just launching the points everywhere into the maximum chaos it can get away with while providing an aesthetically/functionally correct solution!

While not perfect, I also find that Cyberstak already often outperforms MatchSrf in actual match requests, to the point that I frequently find zero surface tangency and curvatures using GlobalEdgeContinuity.

6

I’m finding a combination of Rhino’s match surf, Cyberstrak’s realtime deviation tools and then Cyberstrak’s CP editing tool to be a handy combo in cases like this.

The realtime deviation tools help you massage the shape back as close as you can to the original in double quick time.

7

I’ve said this before but I don’t think one should have to rely on 3rd party plugins to achieve basic functionality in Rhino… but I guess they have to keep the price down somehow.

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