Shouldn’t “Rebuild” place nodes for the rebuilt curve on the original curve when the new requested degree is 1 ?
Curve.3dm (34.1 KB)
Curve.3dm (34.1 KB)
This is because you have chosen “Preserve tangent end directions”. If you untick that box, the control points will all lie on the original curve. With that option enabled, the first control point from the curve end will be placed on the curve tangent line.
Another option to do this is the Convert command where you can choose a tolerance and angle tolerance to divide your curve so that parts with little curvature get fewer points, and parts with more curvature get more points.
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That’s what I thought, and I tried unchecking it.
Seeing that it changed nothing, I decided to post.
The thing is, I needed to hit “Preview” to refresh. So this raises another question : why does the tool sometimes refreshes automatically and sometimes not ?
Same for the “Max deviation” : sometimes it is given, sometimes you neet to kick the dialog in the nuts to get it.
That should just work automatically - my question is why there is a Preview button at all, if changes automatically refresh the preview, but that is beside the point.
I’m not seeing that it stops refreshing the preview, no matter what I do. Can you give a series of steps that reproduces that problem? That will help in getting it fixed.
Yep. But not always.
Strangely, the updating is often sketchy with large amounts of curves or surfaces.
But I swear it happened to me on this very curve.
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Well, actually, no. It’s a very important question.
Maybe it’s here because sometimes, with many inputs the tool gets in “Lazy” mode and doesn’t update, requiring user input.
I would call that “Jamaican user interface design”.
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I think I got it without the outdated stereotype, thank you. It may take a while to update all curves, so it may look like it is not updating it is quite busy calculating all the new changes. Again, if you have a set of reproducable steps that triggers the preview from not updating, let us know.
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Weh yuh ah seh ?
Nope When it happens, its just sitting there, and by hitting “Preview”, it gets the job done rather quick.
Sure. But if you have never noticed this, you probably haven’t been using Rhino much.
lets keep it tidy guys.
Thanks ! Typo corrected.
like my daughter 
the entire room is a mess, she takes one sock and stuffs it somewhere underneath, proudly saying “done”
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To get back on topic: you are correct that with either a large number of curves and/or with a high number of points, the preview is not automatic. When the total number of points (no. points * no. curves) exceeds 500, automatic preview is disabled. This is done to keep the UI responsive while you are editing settings; it would not do to have to wait a long time every time you change a number or (un)tick a box.
The command dialog could be more explicit about that by, for example, only enabling the preview button if you need to press it for updating a preview. https://mcneel.myjetbrains.com/youtrack/issue/RH-82679/Rebuild-not-clear-when-preview-is-automatic
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Well, if you make preview an option, it becomes up to the user to choose whether he wants real time feedback or not.
Better than some obscure and arbitrary non-written rule.
Moreover, the responsiveness really depends on the user’s hardware.
It reminds me the silly warning issued when you want to explode a mesh.