> For the complete documentation index, see [llms.txt](https://technical.geometrygym.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://technical.geometrygym.com/rhino-grasshopper/structuralanalysis/geometry-gym-model/materials.md).

# Materials

## Materials

Materials are generally defined as either standard or explicit (user defined) materials

### Standard Materials

Standard materials relates to materials which are available within the specific programs standard library of materials. To be able to use this correctly it is required that you have a good understanding on how the program names and stores materials within the application.

### Explicit Materials

{% hint style="info" %}
Explicit materials are defined by the **create** keyword.
{% endhint %}

When you require to provide a user specific material there are components which can create this for you under each of the plug-in types. Generally create components will allow you to create materials of these different types (depending on the application you are using):

* Elastic Isotropic
* Elastic Orthotropic
* Fabric

Some programs allow for specific material types such as timber, which require further input values or specific design parameters. Where this is available we provide additional components specific to the application.


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