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 meshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info
See in Glossary to draw all objects in the batch at once. Static batchingA technique Unity uses to draw GameObjects on the screen that combines static (non-moving) GameObjects into big Meshes, and renders them in a faster way. More info
See in Glossary can significantly reduce the number of draw calls.
Static batching is more efficient than dynamic batchingAn automatic Unity process which attempts to render multiple meshes as if they were a single mesh for optimized graphics performance. The technique transforms all of the GameObject vertices on the CPU and groups many similar vertices together. More info
See in Glossary because static batching doesn’t transform vertices on the CPU. For more information about the performance implications for static batching, see Performance implications.
This section includes information about the render pipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info
See in Glossary compatibility of static batching.
| Feature | Universal Render Pipeline (URP) | High Definition Render Pipeline (HDRP) | Custom Scriptable Render Pipeline (SRP) | Built-in Render Pipeline |
|---|---|---|---|---|
| Static Batching | Yes | Yes | Yes | Yes |
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 GameObjectThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject’s functionality is defined by the Components attached to it. More info
See in Glossary, 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.
Note: There are limits to the number of vertices a static batch can include. Each static batch can include up to 64000 vertices. If there are more, Unity creates another batch.