What do the red rectangles on points mean?

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 From:  futagoza (STEFAN)
6473.1 
Hi Michael,

just curious what those red rectangles in MoI mean, after i used show points, because i never have seen them before. It's just an .iges exported hair curve (from Hair saloon) in Shade.

Best regards
Stefan


EDITED: 30 Oct 2016 by STEFAN

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 From:  futagoza (STEFAN)
6473.2 In reply to 6473.1 
Ok, just examined the spline and it seems that those are overlapping points, because when i move one it reveals another one and then the red rectangle disappears.

Regards
Stefan
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 From:  Michael Gibson
6473.3 In reply to 6473.1 
Hi Stefan, it means that there are multiple control points of the curve stacked up right on top of the same location.

That can be problematic because it degrades some of the mathematical properties of the curve at those spots, it's not a bad idea to reconstruct curves that have those in it before you try to build surfaces from them. If you end up with surfaces that have a bunch of control points stacked on on the same location (other than the pole point for a sphere like one), that can prevent intersections from working very well.

That particular curve looks like it's pretty bad with every single point maybe being a stacked up control point.

- Michael
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 From:  futagoza (STEFAN)
6473.4 
Thank you very much for the explanation, Michael. Much appreciated!

Best regards
Stefan
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