## siRenderShutterType

### Introduced

v6.01

### Description

Controls when the camera's shutter opens and closes when generating motion blur for render.

### C# Syntax

    siRenderShutterType.siRenderShutterCenterOnFrame                            // 0
    siRenderShutterType.siRenderShutterEndOnFrame                               // 1
    siRenderShutterType.siRenderShutterStartOnFrame                             // 2

Constant | Value | Description
--- | --- | ---
siRenderShutterCenterOnFrame | 0 | The mid-point of the shutter open period is centered on the frame being rendered, with the open and close shutter equally distant on either side of the frame.
siRenderShutterEndOnFrame | 1 | The shutter should close on the current frame, and open at "shutter speed" frames before the current frame.
siRenderShutterStartOnFrame | 2 | The shutter should open on the current frame, and close at "shutter speed" frames past the current frame.

### Applies To

ShutterType context attribute (Process callback) Custom Renderers