forked from BilalY/Rasagar
24 lines
1.7 KiB
Markdown
24 lines
1.7 KiB
Markdown
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# Use the multiframe rendering API
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Use the multiframe rendering API to record frames that HDRP accumulates. The multiframe rendering API contains the following calls:
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- `BeginRecording`: Call this when you want to start a multi-frame render.
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- `PrepareNewSubFrame`: Call this before rendering a new subframe.
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- `EndRecording`: Call this when you want to stop the multi-frame render.
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The only call that takes any parameters is **BeginRecording**. Here is an explanation of the parameters:
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| Parameter | Description |
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| ------------------- | ------------------------------------------------------------ |
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| **Samples** | The number of sub-frames to accumulate. This parameter overrides the number of path tracing samples in the [Volume](understand-volumes.md). |
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| **ShutterInterval** | The amount of time the shutter is open between two subsequent frames. A value of **0** results in an instant shutter (no motion blur). A value of **1** means there is no (time) gap between two subsequent frames. |
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| **ShutterProfile** | An animation curve that specifies the shutter position during the shutter interval. Alternatively, you can also provide the time the shutter was fully open; and when the shutter begins closing. |
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Before calling the accumulation API, the application should also set the desired `Time.captureDeltaTime`. The example script below demonstrates how to use these API calls.
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## Limitations
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The multi-frame rendering API internally changes the `Time.timeScale` of the Scene. This means that:
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- You can't have different accumulation motion blur parameters per camera.
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- Projects that already modify this parameter per frame aren't be compatible with this feature.
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