# Weird constraint sketch behavior / bug

**URL:** <https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329>\
**Category:** Modeling Questions\
**Created:** [May 4, 2018, 9:32pm UTC](https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329 "2018-05-04T21:32:55Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nico\_h](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/nico_h/32/1790_2.png) [@nico\_h](https://discourse.shapr3d.com/u/nico_h)\
**Post date:** [May 4, 2018, 9:32pm UTC](https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329/1 "2018-05-04T21:32:55Z")

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Hi Shapr 3D Team

I am very impressed by the software and I wanted to create some replacement caps for my cloth dryer that are getting broken.  
The diameter of the tubing is 13.1 millimeter so I am trying to create an L shape with a 6.55 millimeter in the short leg.

While trying to create and adjust this L shape, I found 1 bug and 1 puzzling feature:

- when dragging the side of a rectangle, it is possible to make the opposite side move away. [https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/9/9b7e0d2e4edb9964b20bcd841c2699b68a789501.MOV](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/9/9b7e0d2e4edb9964b20bcd841c2699b68a789501.MOV) I think that one is a bug.
- when adding sub millimeter length constraint it seems the sketch
  - adjust the position of both points of the segment and not the last.
  - when dragging the segment around, the dragged segment will snap to grid with the same offset, the ends will not. Dragging from a selected end point to a grid point will switch subsequent segment dragging to have the end points snap to grid.
  - when adding a length constraint to a segment, perpendicular segment position will also be adjusted, and not the “free” end.  
[https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/6/6c99feb18aed382e2314cd7d795377ed248e656f.MOV](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/6/6c99feb18aed382e2314cd7d795377ed248e656f.MOV)

I don’t know if the above is a bug or a feature, but it is extremely annoying, as that can throw off a big sketch.

Using Shapr3D 3.1.3 on iOS 11.4 beta 2 iPad Pro 10.1”

Any comment would be much appreciated.

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [May 4, 2018, 9:34pm UTC](https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329/2 "2018-05-04T21:34:41Z")

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Our sketch engine is being replaced. It should be released in 3-4 weeks.

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**Author:** ![GeraldVowles](https://avatars.discourse-cdn.com/v4/letter/g/57b2e6/32.png) [@GeraldVowles](https://discourse.shapr3d.com/u/GeraldVowles)\
**Post date:** [May 5, 2018, 12:35am UTC](https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329/3 "2018-05-05T00:35:45Z")

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Does that mean you’re switching away from Parasolid, the same engine that powers SolidWorks, Siemens NX, Solid Edge and many more run on? That was a recent upgrade wasn’t it?

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**Author:** ![Istvan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/istvan/32/23668_2.png) [@Istvan](https://discourse.shapr3d.com/u/Istvan)\
**Post date:** [May 5, 2018, 4:35am UTC](https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329/4 "2018-05-05T04:35:17Z")

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No. That’s the geometric engine. Sketch engine is just the part that is used for the constraints. Parasolid rocks. 🙂

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**Author:** ![nico\_h](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/nico_h/32/1790_2.png) [@nico\_h](https://discourse.shapr3d.com/u/nico_h)\
**Post date:** [May 5, 2018, 6:40am UTC](https://discourse.shapr3d.com/t/weird-constraint-sketch-behavior-bug/2329/5 "2018-05-05T06:40:19Z")

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Wow, thanks for such a quick reply! Looking forward to the next revision.