Dynamic Batching

Dynamic batching is a technique used in computer graphics and game development to optimize rendering performance by grouping together objects or meshes with similar rendering properties at runtime. Unlike static batching, dynamic batching allows for changes and updates to the objects while still benefiting from reduced draw calls and improved rendering efficiency.

Dynamic batching works by combining objects that share the same material, shader, or other rendering properties into a single batch. This grouping allows for more efficient rendering because multiple objects can be rendered with a single draw call, reducing the CPU-GPU communication overhead.

The process of dynamic batching occurs during runtime as objects are processed for rendering. The rendering engine analyzes the properties of the objects and determines which ones can be batched together. This can be done automatically by the engine or manually by the developer through API calls or specific coding techniques.

Dynamic batching offers several benefits:

1. Reduced Draw Calls: By grouping objects with similar rendering properties, dynamic batching reduces the number of draw calls required to render the scene. This reduces CPU-GPU communication overhead and can significantly improve rendering performance, especially in scenes with many objects.
2. Improved Rendering Efficiency: With fewer draw calls, dynamic batching can reduce the overhead associated with state changes, shader switches, and other rendering pipeline operations. This leads to improved rendering efficiency and a smoother rendering experience.
3. Flexibility for Dynamic Objects: Dynamic batching allows for objects that undergo changes or updates, such as moving or deforming, to be grouped together efficiently. This is particularly useful for objects that need to be modified or transformed frequently, as they can still benefit from reduced draw calls and improved performance.

It’s important to note that dynamic batching does have some limitations. As objects are grouped together, they need to have similar rendering properties to be efficiently batched. Objects with vastly different materials, shaders, or other rendering properties may not benefit from dynamic batching and might require separate draw calls.

In summary, dynamic batching is a technique used to optimize rendering performance by grouping objects or meshes with similar rendering properties at runtime. It reduces the number of draw calls and improves rendering efficiency while still allowing for changes and updates to the objects. Dynamic batching is beneficial for scenes with many objects and is particularly useful for objects that undergo frequent modifications or transformations.