Use the multiframe rendering API
Use the multiframe rendering API to record frames that HDRP accumulates. The multiframe rendering API contains the following calls:
BeginRecording: Call this when you want to start a multi-frame render.PrepareNewSubFrame: Call this before rendering a new subframe.EndRecording: Call this when you want to stop the multi-frame render.
The only call that takes any parameters is BeginRecording. Here is an explanation of the parameters:
| Parameter | Description |
|---|---|
| Samples | The number of sub-frames to accumulate. This parameter overrides the number of path tracing samples in the Volume. |
| 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. |
| 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. |
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.
Limitations
The multi-frame rendering API internally changes the Time.timeScale of the Scene. This means that:
- You can't have different accumulation motion blur parameters per camera.
- Projects that already modify this parameter per frame aren't be compatible with this feature.