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How to Optimise Your Unity Game With Static Batching

Greetings, in this Unity tutorial we shall be looking at how to add static batching to your Unity game to reduce draw calls and improve your frame rate.

Static batching is a draw call batching method that combines meshes that don’t move to reduce draw calls. It transforms the combined meshes into world space and builds one shared vertex and index buffer for them. Then Unity performs a single draw call that uses this combined mesh to draw all objects in the batch at once. Static batching can significantly reduce the number of draw calls.

Static batching works best when you will have a lot of objects that will be staying still in your game. Like a city or maybe a forest. A static object is not allowed to change its transform. So a static object must not move, rotate or change scale. Moving a static object will break your static batching, meaning you won't benefit from the reduced draw calls and thus not improve the frame rate.

To static batch, you need to firstly mark objects or prefabs as static. You can do so in the inspector for the object by clicking on the tick box in the top right corner next to the text static. You can double check the object was flagged as static by clicking the drop down arrow next to text static and ensure the flag in the drop down menu batching static is ticked. If it isn't click on it.

You can mass flag objects as static if you make the parent static. When doing so you will be asked if you want to make the children objects static. This can save a lot of time implementing static batching.

That is all you need to do to implement static batching in Unity. When testing your game in the editor, you can use the stats window to see how many draw calls Unity is doing per frame to render the current frame, but also how many batches Unity has saved by implementing static bathcing. This is a great way to see if static batching is helping optimise your game.

Static bacthing in some cases will not result in performance gains, it depends on the type of game. But it is worth giving a try. Static batching is especially useful when performance matters, such as with mobile games and webgl games.

Thanks for watching this Unity optimization tutorial on static batching.

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How to Optimise Your Unity Game With Static Batching

Extra notes: Using static batching requires additional CPU memory to store the combined geometry. If multiple GameObjects use the same mesh, Unity creates a copy of the mesh for each GameObject, and inserts each copy into the combined mesh. This means that the same geometry appears in the combined mesh multiple times. Unity does this regardless of whether you use the editor or runtime API to prepare the GameObjects for static batching. If you want to keep a smaller memory footprint, you might have to sacrifice rendering performance and avoid static batching for some GameObjects. For example, marking trees as static in a dense forest environment can have a serious memory impact.

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