# Explode geometry issue

**URL:** <https://forum.dynamobim.com/t/explode-geometry-issue/14863>\
**Category:** Geometry\
**Tags:** revit, dynamo\
**Created:** [September 16, 2017, 9:36am UTC](https://forum.dynamobim.com/t/explode-geometry-issue/14863 "2017-09-16T09:36:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![talbimam](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/talbimam/32/32376_2.png) [@talbimam](https://forum.dynamobim.com/u/talbimam)\
**Post date:** [September 16, 2017, 9:36am UTC](https://forum.dynamobim.com/t/explode-geometry-issue/14863/1 "2017-09-16T09:36:39Z")

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![Capture](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/8/9/8966ec80478f6e023d351a3b8243e6ad4b1544d2.png)  
Hello everybody ! i have an issue when i try to offset the boundary of a room with circular wall.  
at first i get the boundaries then i use the PolyCurve.ByJoinedCurves node to join them, after that i make the offst and use Explode geometry node to have a multiple curves again ! but the forth curve is not an arc anymore and i get an error when it comes to generate Wall.ByCurveAndHeight, if some could help it would be great 🙂

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [September 16, 2017, 10:16am UTC](https://forum.dynamobim.com/t/explode-geometry-issue/14863/2 "2017-09-16T10:16:48Z")

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The curve appears to have become a nurbs curve. Try using a Curve.ApproximateWithLineAndSegments node to recreate as wall buildable geometry.

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**Author:** ![talbimam](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/talbimam/32/32376_2.png) [@talbimam](https://forum.dynamobim.com/u/talbimam)\
**Post date:** [September 16, 2017, 11:17am UTC](https://forum.dynamobim.com/t/explode-geometry-issue/14863/3 "2017-09-16T11:17:47Z")

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JacobSmall, Thank you very much it worked well with Curve.ApproximateWithArcAndLineSegments node !! even if there is a little bit of rumpus when visualising the final results

 ![Capture](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/8/68ae89b673f04f52a201483e21b549d1e84855f9.png)