# Solid.ByLoft operation fails

**URL:** <https://forum.dynamobim.com/t/solid-byloft-operation-fails/41744>\
**Category:** Geometry\
**Created:** [October 12, 2019, 11:17am UTC](https://forum.dynamobim.com/t/solid-byloft-operation-fails/41744 "2019-10-12T11:17:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![iart\_kore](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/iart_kore/32/82673_2.png) [@iart\_kore](https://forum.dynamobim.com/u/iart_kore)\
**Post date:** [October 12, 2019, 11:17am UTC](https://forum.dynamobim.com/t/solid-byloft-operation-fails/41744/1 "2019-10-12T11:17:55Z")

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Greetings Dynamo Forum,

i am currently trying to create “excavation solid volumes” starting from the perimeter boundary of lean concrete floor. After i offset - translate - offset the polys i try to Solid.ByLoft but unsuccessfully i get the msg : “Unable to Loft - Bad\_Wires” for some of the polys, while most of them do create successfully.

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/9/5/957df597e1107dd9dd469a078a1840a527adc12a.png)

please check the files at this link google drive [rvt file is large and cannot be uploaded here]

[https://drive.google.com/drive/folders/10ImfZ12MiYiNWLRNtDXJYGXpho9J\_piQ?usp=sharing](https://drive.google.com/drive/folders/10ImfZ12MiYiNWLRNtDXJYGXpho9J_piQ?usp=sharing)

dyn core : 2.2.1.5175  
dyn revit : 2.1.0.7733  
revit 2020.1

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<div class="post-metadata">

**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:** [October 12, 2019, 12:05pm UTC](https://forum.dynamobim.com/t/solid-byloft-operation-fails/41744/2 "2019-10-12T12:05:39Z")

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Try building the edges the lofts would have using a PolyCurve.ByPoints node. This often identifies the issue which the loft is facing.

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<div class="post-metadata">

**Author:** ![iart\_kore](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/iart_kore/32/82673_2.png) [@iart\_kore](https://forum.dynamobim.com/u/iart_kore)\
**Post date:** [October 12, 2019, 12:08pm UTC](https://forum.dynamobim.com/t/solid-byloft-operation-fails/41744/3 "2019-10-12T12:08:47Z")

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just found out that dynamo does not like the seat backs created by auto join / auto cut of elements ![err2](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/5/c/5c04732de98e23e7fb49c75956f3790d4161894d.png) .  
i unjoined the elements (now they clash but the scripts works !!!)

 ![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/5/65d97de9557e36497d85b5e67c363542aa08c08f.png)