forked from BilalY/Rasagar
55 lines
3.2 KiB
Markdown
55 lines
3.2 KiB
Markdown
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# Use the GPU Resident Drawer
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The GPU Resident Drawer automatically uses the [`BatchRendererGroup`](https://docs.unity3d.com/Manual/batch-renderer-group.html) API to draw GameObjects with GPU instancing, which reduces the number of draw calls and frees CPU processing time. For more information, refer to [How BatchRendererGroup works](https://docs.unity3d.com/Manual/batch-renderer-group-how.html).
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The GPU Resident Drawer works only with the following:
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- [Graphics APIs](https://docs.unity3d.com/6000.0/Documentation/Manual/GraphicsAPIs.html) and platforms that support compute shaders.
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- GameObjects that have a [**Mesh Renderer** component](https://docs.unity3d.com/Manual/class-MeshRenderer.html).
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Otherwise, Unity falls back to drawing the GameObject without GPU instancing.
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If you enable the GPU Resident Drawer, the following applies:
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- Build times are longer because Unity compiles all the `BatchRendererGroup` shader variants into your build.
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## Enable the GPU Resident Drawer
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To enable the GPU Resident Drawer, follow these steps:
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1. Go to **Project Settings** > **Graphics**, then in the **Shader Stripping** section set **BatchRendererGroup Variants** to **Keep All**.
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2. Go to the active [HDRP Asset](HDRP-Asset.md), then in the **Rendering** section set **GPU Resident Drawer** to **Instanced Drawing**.
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If you change or create GameObjects each frame, the GPU Resident Drawer updates with the changes.
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To include or exclude GameObjects from the GPU Resident Drawer, refer to [Make a GameObject compatible with the GPU Resident Drawer](make-object-compatible-gpu-rendering.md).
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## Analyze the GPU Resident Drawer
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To analyze the results of the GPU Resident Drawer, you can use the following:
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- [Frame Debugger](https://docs.unity3d.com/Manual/FrameDebugger.html). If the GPU Resident Drawer groups GameObjects, the Frame Debugger displays draw calls called **Hybrid Batch Group**.
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- [Rendering Debugger](rendering-debugger-window-reference.md)
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- [Rendering Statistics](https://docs.unity3d.com/Manual/RenderingStatistics.html) to check if the number of frames per second has increased, and the CPU processing time and SetPass calls have decreased.
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- [Unity Profiler](https://docs.unity3d.com/Manual/Profiler.html)
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## Optimize the GPU Resident Drawer
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How much the GPU Resident Drawer speeds up rendering depends on your scene. The GPU Resident Drawer is most effective in the following setups:
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- The scene is large.
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- Multiple GameObjects use the same mesh, so Unity can group them into a single draw call.
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Rendering usually speeds up less in the Scene view and the Game view, compared to Play mode or a final built project.
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The following might speed up the GPU Resident Drawer:
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- Go to **Project Settings** > **Player**, then in the **Other Settings** section, disable **Static Batching**.
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- Go to **Window** > **Panels** > **Lighting**, then in the **Lightmapping Settings** section enable **Fixed Lightmap Size** and disable **Use Mipmap Limits**.
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## Additional resources
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- [Reduce rendering work on the CPU](reduce-rendering-work-on-cpu.md)
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- [Graphics performance fundamentals](https://docs.unity3d.com/Manual/OptimizingGraphicsPerformance.html)
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- [GPU occlusion culling](gpu-culling.md)
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