# 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 ![](https://777932824-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJXK0YXrcDUpbe_Du_o%2F-MkC3TkHbsmQ0Z98TfiZ%2F-MkCufIo_kDQ2IdQXFcg%2Fgenerate_in_model.gif?alt=media\&token=19b1216c-cc64-4c82-b9e7-187f4b1bfea2) ## "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 ![](https://777932824-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJXK0YXrcDUpbe_Du_o%2F-MkC3TkHbsmQ0Z98TfiZ%2F-MkCuis9dgEpGneihUyQ%2Fgenerate_render_only.gif?alt=media\&token=cda53e13-7807-417f-b84a-aad8dfb301c0) {% 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.