Simple unreal plugin that exposes an engine function to blueprints to disable the rendering of the viewport.
Since Unreal 5.5 it is possible to output the Viewport directly to NDI, thus avoiding rendering the scene 2 times. So the plugin doesn’t make much sense now. Here is a sample project in Unreal 5.6.1 showing how to do it, it also shows how you would use the plugin with a SceneCapture2D without using third party plugins.
Useful for when you want to render the scene using a SceneCapture2D to a RenderTexture which is then being sent in real-time to another software using a protocol like NDI, Spout or Texture Share.
You can see an improvement in performance of around 20% by disabling the viewport rendering.
Copy the DisableRendering folder to your projects Plugins folder. If it doesn't exist, create it.
I included a BP_DisableEditorRendering blueprint in the plugin's content folder that uses the function for the aforementioned use case. Drag that blueprint to your scene and set the properties in the Details Panel to your liking.
It sets the bDisableWorldRendering property of the UGameViewportClient. More information.
This also stops the rendering of SceneCapture2D components, but you can manually call CaptureScene() every frame to get them to render anyway. BP_DisableEditorRendering does this automatically.
Tested on Unreal 5.6.1