# IGES Export Error?

**URL:** <https://discourse.shapr3d.com/t/iges-export-error/11784>\
**Category:** Modeling Questions\
**Created:** [March 10, 2021, 3:24am UTC](https://discourse.shapr3d.com/t/iges-export-error/11784 "2021-03-10T03:24:13Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Yepher](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/yepher/32/8902_2.png) [@Yepher](https://discourse.shapr3d.com/u/Yepher)\
**Post date:** [March 10, 2021, 3:24am UTC](https://discourse.shapr3d.com/t/iges-export-error/11784/1 "2021-03-10T03:24:13Z")

</div>

Cad file formats are completely new to me but I am trying to learn the `IGES` file format. I exported a simple cylinder from Shapr3D as `IGES`.

[cyl.shapr](https://discourse.shapr3d.com/uploads/short-url/pMqujMwDmUIAJBiHuXsdU2tQcw7.shapr) (4.3 KB)

As I read through the spec and compare that to the `IGES` file produced by Shapr3d something does not look correct. Either Shapr3D has a bug or I misunderstand how Hollerith format works (which is very possible, I am no FORTRAN expert):

This is the **G** lobal Section from the IGES file:

```auto
1H,,1H;,89H/var/folders/cg/xpwdhpv9635ctpsvh4w5rl900000gn/T/4204B791-548G 1
9-43AB-8ACF-5920E0F3EA0E.tmp,67H/var/folders/cg/xpwdhpv9635ctpsvh4w5rl90G 2
0000gn/T/export/temp_export,7HShapr3D,3H3.0,32,24,8,56,15,89H/var/folderG 3
s/cg/xpwdhpv9635ctpsvh4w5rl900000gn/T/4204B791-5489-43AB-8ACF-5920E0F3EAG 4
0E.tmp,1.,2,2HMM,1000,1.,13H210309.191307,1D-05,1000000.,,,9,0,13H210309G 5
.191307; G 6

```

As a concrete example of the issue, shouldn’t:

`89H/var/folders/cg/xpwdhpv9635ctpsvh4w5rl900000gn/T/4204B791-548G 1 9-43AB-8ACF-5920E0F3EA0E.tmp`

be encoded like this instead?

`98H/var/folders/cg/xpwdhpv9635ctpsvh4w5rl900000gn/T/4204B791-548G 1 9-43AB-8ACF-5920E0F3EA0E.tmp`

I believe all the length values are reversed (or something). I expect a “strict” IGES parser will blow up on that and has a big potential for data frame alignment issues if the values are actually parsed.

This is another export from iPad version:

```auto
1H,,1H;,129H/private/var/mobile/Containers/Data/Application/74E1F485-0FAG 1
9-4366-BC85-7F9A102E31C7/tmp/45F0381F-3B85-4A03-9D9E-BB53A645FBEB.tmp, G 2
107H/private/var/mobile/Containers/Data/Application/74E1F485-0FA9-4366-BG 3
C85-7F9A102E31C7/tmp/export/temp_export,7HShapr3D,3H3.0,32,24,8,56,15, G 4
129H/private/var/mobile/Containers/Data/Application/74E1F485-0FA9-4366-BG 5
C85-7F9A102E31C7/tmp/45F0381F-3B85-4A03-9D9E-BB53A645FBEB.tmp,1.,2,2HMM,G 6
1000,1.,13H210309.213201,1D-05,1000000.,,,9,0,13H210309.213201; G 7

```

`129H/private/var/mobile/Containers/Data/Application/74E1F485-0FAG 1 9-4366-BC85-7F9A102E31C7/tmp/45F0381F-3B85-4A03-9D9E-BB53A645FBEB.tmp`

should be

`138H/private/var/mobile/Containers/Data/Application/74E1F485-0FAG 1 9-4366-BC85-7F9A102E31C7/tmp/45F0381F-3B85-4A03-9D9E-BB53A645FBEB.tmp`

---

<div class="post-metadata">

**Author:** ![Koko\_Shapr3D](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/koko_shapr3d/32/1703_2.png) [@Koko\_Shapr3D](https://discourse.shapr3d.com/u/Koko_Shapr3D)\
**Post date:** [March 10, 2021, 1:42pm UTC](https://discourse.shapr3d.com/t/iges-export-error/11784/2 "2021-03-10T13:42:39Z")

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Thanks, we will look into this.

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<div class="post-metadata">

**Author:** ![Koko\_Shapr3D](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/koko_shapr3d/32/1703_2.png) [@Koko\_Shapr3D](https://discourse.shapr3d.com/u/Koko_Shapr3D)\
**Post date:** [March 10, 2021, 1:54pm UTC](https://discourse.shapr3d.com/t/iges-export-error/11784/3 "2021-03-10T13:54:32Z")

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The file seems correct, because the part `G 1` is not part of the content (just formatting). For example  
`/var/folders/cg/xpwdhpv9635ctpsvh4w5rl900000gn/T/4204B791-5489-43AB-8ACF-5920E0F3EA0E.tmp` has exactly 89 characters.

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<div class="post-metadata">

**Author:** ![Yepher](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/yepher/32/8902_2.png) [@Yepher](https://discourse.shapr3d.com/u/Yepher)\
**Post date:** [March 10, 2021, 3:15pm UTC](https://discourse.shapr3d.com/t/iges-export-error/11784/4 "2021-03-10T15:15:43Z")

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> [@Yepher](#):
>
> /private/var/mobile/Containers/Data/Application/74E1F485-0FAG 1 9-4366-BC85-7F9A102E31C7/tmp/45F0381F-3B85-4A03-9D9E-BB53A645FBEB.tmp

Oh, I did not remove the framing before counting! you are right. Sorry for the false alarm