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Additional info, example images, and demo scenes to be added.

Table Of Contents

Overview


Motion Blur 

Enabled

Enables / Disables motion blur.


If a Motion Vector AOV is enabled in your scene all Redshift motion blur will automatically be disabled in the beauty render as this would be undesirable for a Motion Vector AOV.

For more information, please see here.


Transformation Steps

This controls the number of linear steps that Redshift will use to represent the trajectory of cameras, lights and objects for motion blur.

More steps means the trajectories will be more accurate and the motion blur will look smoother but more memory will also be used.


In the example images below notice how the trajectory of the moving lantern is more appropriately rendered as the Transformation Steps are increased. All renders were taken from the same animation, the only thing changed were the Transformation Steps count.


Motion Blur: Disabled

Transformation Steps: N/A

Enabled

2

Enabled

4

Enabled

10

Deformation Blur

Enables / Disables deformation motion blur, disabled by default.

Deformation Blur tracks the motion of individual vertices and can be memory-intensive especially for high-poly or displaced geometry, if your objects do not have animated deformation this parameter can be left disabled for increased performance. For more information please see this page.

 If your objects do not have animated deformation (like skinned character animation) this parameter can be left disabled for increased performance. For more information please see this page.

Deformation Steps

This controls the number of linear steps that Redshift will use to represent the trajectory of moving vertices on deforming objects.

More steps means the trajectories will be more accurate and the motion blur will look smoother but more memory will also be used.

Frame Duration

Controls the number of frames for which the camera's virtual 'shutter' will stay open.

As in real-life, the larger this value the blurrier the motion blur results.

Since this parameter has to do with frame duration, it is affected by the animation frame rate set in your modeling program.


Shutter


The Shutter settings allow the user to fine-tune the time range of motion blur for the specified frame range (remember that the total number of frames used for motion blur is controlled by the 'frame duration' setting).

The smaller the difference between the shutter start and end, the shorter the blur - and vice-versa.

For this reason, start/end pair values of 0.0/0.5 and 0.5/1.0 would produce the same amount of blur because the difference between them is 0.5 in both cases. However, the motion blur will be 'offset' near the start and end of the frame range respectively.

Start

Sets the start point of the motion blur within the frame duration relative to the frame position.

This value can range from 0.0 to 1.0. A value of 0.0 corresponds to the very beginning of the frame duration and a value of 1.0 corresponds to the very end of the frame duration.

Below are some example values and their resulting behaviors if you were rendering frame 10 of an animation with a Frame Position of Center and with an End value of 1.0.

Start valueMotion Blur Start FrameBehavior
0.0Frame 9.5

Motion blur begins at the very beginning of the frame duration, starting as early as possible and resulting in the most motion blur possible within the frame duration.

0.5Frame 9.75Motion blur begins half way through the frame duration resulting in half as much motion blur possible within the frame duration.
1.0Frame 10.5No motion blur because there is no difference between the start and end values.

End

Sets the end point of the motion blur within the frame duration relative to the frame position.

This value can range from 0.0 to 1.0. A value of 0.0 corresponds to the very beginning of the frame duration and a value of 1.0 corresponds to the very end of the frame duration.

Below are some example values and their resulting behaviors if you were rendering frame 10 of an animation with a Frame Position of Center and with an Start value of 0.0.

End valueMotion Blur End FrameBehavior
0.0Frame 9.5

No motion blur because there is no difference between the start and end values.

0.5Frame 10.25Motion blur stops half way through the frame duration resulting in half as much motion blur possible within the frame duration.
1.0Frame 10.5

Motion blur stops at the very end of the frame duration, ending as late as possible and resulting with the most motion blur possible within the frame duration.

Frame Position

Controls the offset of the motion blur within the frame duration relative to the rendered frame.

  • Start - Starts motion blur at the rendered frame. 
    • For example: No motion is visible from any frames prior to the rendered frame.
  • Center - Centers the motion blur on the rendered frame.
    • For example: Motion is visible both in front of and after the rendered frame.
  • End - Ends motion blur at the rendered frame.
    • For example: No motion blur is visible from any frames after the rendered frame.


In the example images below is a 100 frame animation and the rendered frame is frame 50. The dragon is moving upwards and the motion blur frame duration setting is set to 50 (i.e. 50 frames).

Frame Position: Start

Center

End

Efficiency

Controls how fast the shutter opens and closes.

Real-life camera shutters don't open instantaneously – they open gradually. A setting of 1.0 (the default) means the shutter will open instantly, while a setting of 0.0 means that it will open as gradually as possible.

The images below show how the shutter efficiency parameter efficiency affects the shutter opening speed.


Efficiency 1.0

Efficiency 0.3

Efficiency 0.0


The shutter efficiency parameter affects the look of motion blur trails as shown in the example pictures below. Notice how the motion blur trails appear smoother when the Efficiency is set to 0.

Efficiency 1.0

Efficiency 0.7

Efficiency 0.0