Reversed Selection Behavior

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Reversed Selection Behavior

Postby plot-paris » Fri Apr 21, 2017 10:55 am

Hi Thomthom,

when modelling a sofa with your superb plugin I came across a peculiar behavior, that seems to occur with any geometry generated with SUbD, whether it is a live SUbD object or a plain mesh generated from it...

Surely you are familiar with the excellent trick of SketchUp, where the direction in which you draw a selection frame influences what is being selected.
  • When you draw from left to right, only geometry completely enclosed by the selection frame is being highlighted
  • When you draw from right to left, all geometry touched by the selection frame is being highlighted.

Now, with a SUbD mesh, selectin in such a manner does work. If however you press SHIFT / CTRL or both to add or subtract from a selection, this behavior is reversed (or behaves in another, unpredictable manner). Can you reproduce this?

To make things easier, I have attached a file with a SUbD mesh on the left and an ordinary object on the right. Here you can easily see the difference when selecting using the modifier keys.

This is not a big issue, of course. But interesting nontheless ;-)
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Re: Reversed Selection Behavior

Postby thomthom » Fri Apr 21, 2017 11:54 am

When you have a subdivided mesh and you perform selections SUbD will try to expand the selection of the sub-entities to match the original control-entities.

Unfortunately the API was lacking some feature to implement this to match SU's original behaviour. However, recently I think this has become possible. I have an issue logged to improve the box-selections.
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Re: Reversed Selection Behavior

Postby plot-paris » Fri Apr 21, 2017 2:30 pm

Ah, I see. That does make sense.

However, this behavior seems to stay with the geometry, even if you convert it to a plain mesh and explode the group. Could you find a way to undo this on conversion?
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Re: Reversed Selection Behavior

Postby thomthom » Fri Apr 21, 2017 8:45 pm

Hmm... that is strange, if you convert to plain mesh SUbD should not be interfering...

Can you show a video/gif of what you observe? Maybe we are talking about different things?
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