# Materials
Randomly assign different materials to the instances to introduce variations.
It works the same way as applying a material to a component or a group in SketchUp: only the blank faces in the components will receive the material. If faces already have a material, their material cannot be replaced.
{% hint style="info" %}
When using "[Render-only](/manual/generating.md#render-only-generation)", this feature is supported by V-Ray and Thea, but not Enscape at this time.
{% endhint %}
Click on the 
icon to select materials in a list, or click the 
icon to pick the materials directly in the viewport.
| Parameter | Description |
| ------------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Probability | Relative probability of the object to be assigned |
| Compatible objects | Objects that can be assigned this material.
By default, all the objects can be assigned all the materials but it can be useful to be more restrictive in some cases.
|
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