# Generating instances
Skatter offers two modes for generating instances: [**In model**](#in-model-generation) and [**Render Only**](#render-only-generation).
## "In Model" generation
*In Model* is the default mode. It will create instances directly in the model, as regular SketchUp geometry.
The benefits of In Model generation are:
* ✔️ Instances are directly visible in the SketchUp viewport
* ✔️ No need for an external render engine
* ❌ It can significantly slow down the SketchUp viewport when generating thousands of instances
## "Render Only" generation
In *Render Only* mode*,* instances will not be created in the model. Instead, the data will be directly handed to the render engines.
The benefits of Render Only generation are:
* ✔️ Better performance when creating large compositions with thousands of instances
* ❌ The instances are not visible in the SketchUp viewport after you close the Composition Editor
{% hint style="success" %}
Render Only mode is currently supported by V-Ray 5, Enscape, Thea, Octane, Indigo, Shaderlight, IRender nXt, Twilight Pro, Raylectron, and Kerkythea.
{% endhint %}
## Preview before generating
By default, Skatter automatically displays a preview in the SketchUp viewport when you work on a composition. When working on very complex compositions, the preview can take a little while to compute, so you can disable it by clicking the 
icon.
When working on a composition, you might want to preview another composition at the same time. Click on the arrow next to the 
icon and select the other compositions that you want to display.
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