> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/e3d-user-manual/interface/toc175916526/toc175916652/toc161393871/toc161393873.md).

# Rectangular Shells

How to quickly generate a rectangular mesh of shells using a distance list in the analysis module.

Create > Model Generators > Rectangular Shells prompts you with the following dialog.

![](https://560001759-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWNe8U6EBBBdUJHdb2X9G%2Fuploads%2Fgit-blob-a27a46fa5e49cc8e1c2197ed688822959d2e49df%2FFASTFR~1_img96.png?alt=media)

It allows you to quickly generate shells in a rectangle. The distance list is a comma separated list that specifies multiple distances. For example, a distance list of “12,2\@14,3\@10” will generate distances of 12, 14, 14, 10, 10 and 10 in length units. You may specify an insertion point to translate and rotation parameters to rotate the generated shells. The generated shells have the default thickness and material properties. You may assign them appropriate properties using commands in the Modify ribbon.

This command can only generate shells in a rectangle. To generate shells in a general quadrilateral, you may first define one quadrilateral shell and then use the command Modify > Sub-Mesh Shells to sub-divide it.

The following example shows a 10x10 rectangular mesh of shells generated using the input from the screen capture above.

![](https://560001759-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWNe8U6EBBBdUJHdb2X9G%2Fuploads%2Fgit-blob-47a5b64f2d7f7863ee84ccbe57db9d9ab0a17cc4%2FFASTFR~1_img97.png?alt=media)


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