First, a papercut: Why can’t rebuild automatically select the current CV density by default? I always have to waste time entering the current counts manually. Second: Since I’m not changing any CVs in the U direction, shouldn’t they be unaffected by the rebuild? [bild] Not sure if this is re…

[image] eobet: Why can’t rebuild automatically select the current CV density by default? I always have to waste time entering the current counts manually. Except… imagine the opposite paper cut - you are rebuilding surfaces and you always want say, a 5 by 6… [image] eobet: Since I’m not …

[image] pascal: Except… imagine the opposite paper cut - you are rebuilding surfaces and you always want say, a 5 by 6… Ok, so that sounds like there should be a button to copy the current CVs to those boxes… hmm… I think we’ve discussed this already once before… :slight_smile: Thanks for th…

Hello - [image] eobet: the difference, The difference is that in the rebuild direction you can only get degree 3. That is a significant limitation in many cases… -Pascal

I rarely use “Rebuild surface” (usually only to simplify a surface to become Point count 2 and Degree 1). Instead, I prefer “Rebuild surface UV”, because it preserves the structure of the control points in the opposite direction. You may also want to play with the several types of rebuild in the com…

This particular bug have been discussed in several topics over the past few years, but I think that the programmers at “McNeel” should take it seriously and try to fix it, because “Rebuild surface” is known for producing highly distorted, unusable conversion of single-span surfaces. That’s pity, bec…

I’ve removed that this topic is solved because although RebuildUV might produce better results, Rebuild is still borked when it comes to usable CV distributions and it’s the only thing which works on curves: [image] Ideally, I’d like an option similar to “preserve end tangend directions” to also …

[image] Bobi: Rhino fails to do the math properly and places the control points in a chaotic fashion which is basically unusable. [image] eobet: In other words, if a curve’s control points all lean towards the same direction, a rebuild result should never be allowed to zig-zag. These c…

Often times the idea is to reduce the number of control points (usually they are a much greater number) while converting the curve or surface to single-span Degree 5. This is where Rhino fails a lot.

In this situation - a workaround I often use is to do a BlendCrv using the end points of the curve as the input, and then flip the directions of each end. Then you can have much more control over the distribution of the points and it doesn’t do…yeah that thing.

[image] Bobi: Often times the idea is to reduce the number of control points (usually they are a much greater number) while converting the curve or surface to single-span Degree 5. This is where Rhino fails a lot. In that situation Rebuild can result in aig-zags/oscillations in control point …

Rebuilding surface produces weird CV distribution

Rhino Rhino for Windows

sgreenawalt (Sky G) February 16, 2024, 1:49am 15

These two videos might be helpful:

-Sky

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Rebuilding surface produces weird CV distribution

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