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See the follow file for details: https://www.filedropper.com/filemanager/public.php?service=files&t=757744643cd3d3972ae382af4a4deb91 . I create a spiral structure which is smooth and beautiful, then scale it up by a factor of 10. Once it's scaled up, the geometry has changed. Can anybody tell me why, and if there is a way of avoiding it? Thanks!

operations original_geometry changed geometry edit: scale dialogue

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  • $\begingroup$ This looks like a bug to me... Certainly not the behaviour I'd expect. Can you include a screenshot of the Scale dialog, and maybe attach the file so I can try scaling it in my 2018 install, and also in 2019? $\endgroup$
    – Jonathan R Swift
    Commented May 20, 2020 at 18:38
  • $\begingroup$ scale dialogue added. note it's around the centroid, if I make it from the origin, the final object doesn't fit within the modeler limits (1000m). the original file has already been provided :-) $\endgroup$
    – juggler
    Commented May 21, 2020 at 3:03
  • $\begingroup$ (in the first line of text of the question) :-) $\endgroup$
    – juggler
    Commented May 21, 2020 at 3:11
  • $\begingroup$ Nope - click the link, it takes you to the image again... $\endgroup$
    – Jonathan R Swift
    Commented May 21, 2020 at 8:01
  • $\begingroup$ Looks like you have multiple bodies that are all scaling about their respective centroids? Can you merge them? Or why not make a reference point in the middle of the structure (since origin causes you trouble), and scale from that? $\endgroup$
    – Jonathan R Swift
    Commented May 21, 2020 at 8:03

1 Answer 1

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See below. As I said in my comment - the problem that you're having is that each body scales about its own centroid. If the origin is not OK for you, then you will need to add another coordinate system.

See the .gif below showing how to do this.

enter image description here

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  • $\begingroup$ accepting this answer on the word of john that it represents the answer he already gave, in the comments, which worked. he's awesome. :-D -as for -why- scaling on the centroid causes the problem.. I haven't the foggiest. it makes no sense to me. :-S ;-) $\endgroup$
    – juggler
    Commented May 21, 2020 at 17:19
  • $\begingroup$ @juggler scaling many things from many different positions isnt the same thing as scaling all from same point. $\endgroup$
    – joojaa
    Commented May 21, 2020 at 18:16
  • $\begingroup$ @joojaa -you're right, but if you look at the pictures of the effect being produced, you will agree with me, I hope, that there is no way that such a simple explanation could explain the effect I'm seeing. the parts of my thing are just rotated around an axis, so the centroids could at most be tracing a circle.. ...ahhh... I begin to see how the effect might originate.. $\endgroup$
    – juggler
    Commented May 21, 2020 at 19:01
  • $\begingroup$ @juggler Object centroids for an object like this are hard to predict form the image and their compound action too. To me the effect is perfectly plausible, but then i am into studying emergent behaviors, that literally make surprising outcomes form simple rules that can not be predicted by humans. So I might be biased to the result. $\endgroup$
    – joojaa
    Commented May 21, 2020 at 19:05
  • $\begingroup$ @joojaa fascinating! ..at some point we'll have to get together for a (root)beer with a solidworks programmer and work it all out! ;-) $\endgroup$
    – juggler
    Commented May 21, 2020 at 22:49

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