Camera IMBlur Operator

Path

Particle View > Click Camera IMBlur in an event or add a Camera IMBlur operator to the particle system and then select it.

The Camera IMBlur operator corrects a problem in which Image Motion Blur applied to a Particle Flow system might not render properly when the camera is animated. The operator adjusts the particle speed, accounting for camera motion, before it's passed to the viewport display and/or the renderer. Internally, the Particle Flow engine continues to use the true particle speed for the animation.

TIP: Using the Lines display type makes it easy to see the effect that the operator has on particle motion in the viewports.

Add the Camera IMBlur operator to any event to which you've applied Image Motion Blur. Alternatively, to apply Image Motion Blur to the entire animation, add the Camera IMBlur operator to the global event (by default, PF Source 01), and turn on Image Motion Blur for the global event (via Properties) as well.

Interface

Use Active Camera - When on, uses the camera assigned to the active viewport. When off, you can assign a different camera to the operator. Default=on.

Camera - Click the "None" button and then select a camera in the scene whose motion the operator will use. Thereafter the camera name appears on the button. Available only when Use Active Camera is off.

Use Event IMBlur Multiplier - When on, uses the event's Image Motion Blur multiplier for the camera motion. With this option on, it's not necessary to synchronize the operator's Multiplier value when changing the event's motion blur properties.

Alternatively, you can exaggerate the camera motion by setting up a specific Multiplier value in the interface. Default=on.

Multiplier - Sets a blurring value specific to the operator. For example, you can reduce the relative amount of camera motion blur by setting the operator's Multiplier value to less than 1.0. Available only when Use Event IMBlur Multiplier is off.