Triaxial ellipsoid, DirectEdit fail

[revyakin]

Hi all,

I am trying to create a triaxial ellipsoid (a sphere squashed/stretched along 3 axes). Therefore,

I created a sketch and made an ellipse in the XY plane.

I drew a line across the Y axis and trimmed it to create a half-ellipse.

I revolved it along the Y axis and got a rotationally symmetrical ellipsoid (like one would get in a lathe).

I then tried to 'squash' it along the X axis by scaling non-uniformly by 0.5.

AI showed me the desired shape during preview, but then showed an error message saying DirectEdit failed. No further information. I observed this kind of behaviour with other features as well (i.e. the preview showing the desired result, but then failing w/o further explanation when the tool applied).

I have attached my IPT file, if it helps at all. Tried to locate the log, but failed... for now at least 😞

Autodesk Professional 2016 Student Edition, W7 Pro

[WHolzwarth · Accepted solution]

That's been caused by an inaccurate sketch for the ellipse.

2016 file attached

[revyakin]

Hi Walter,

Thanks a lot for responding. I cannot open the file in my 2016 AI, I need to reinstall the newer build, did not get around to doing it yet.

May I ask to briefly point out what was imprecise in my sketch? I thought it was 'just an ellipse', but I may be wrong

[JDMather · Accepted solution]

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@revyakin wrote:

May I ask to briefly point out what was imprecise in my sketch? I thought it was 'just an ellipse', but I may be wrong

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Line does not have a vertical constraint.

Line does not have coincident constraint between midpoint and origin.

Ellipse does not have a coincident constraint between centerpoint and origin.

Missing two size defining dimensions.

[WHolzwarth]

Oh, oh. I've added the 2018 file before. Now 2016