September 11, 2022 Hana Trieu

Motion Blur advanced render settings in Redshift for Cinema 4D

A real-life camera captures images by opening its shutter for a short period of time and exposing the film or digital sensor to light. When the camera or the objects or lights in the scene move, the image becomes blurry depending on the shutter speed. Motion blur in Redshift simulates that type of blurring effect. In today’s article, iRender is going to introduce you to the Motion Blur and walk you through the advanced render settings of this effect in Redshift for Cinema 4D. Let’s dive into the detailed instruction!

Introduction to Motion Blur in Redshift for Cinema 4D

Redshift supports 03 types of motion blur:

      • Camera motion blur: Blurring happens because of camera movement
      • Transformation motion blur: Happens because of rigid-body motion (object or light transforms)
      • Deformation motion blur: Blurring happens because the object vertices got deformed (due to morphing/skinning, etc)

In order to simulate motion blur, Redshift must track the trajectories of cameras, objects/lights, and vertices, respectively. Redshift renderer uses a sequence of linear segments (referred to as “steps”) to represent curves when motion blur is present. The trajectory simulation is more precise with more steps. Nonetheless, it also consumes more memory. In Redshift, camera blur and transformation blur can have a maximum of 31 steps, and deformation blur’s limitation is 2, 3, 5, 9, and 17 steps.

Motion blur advanced render settings in Redshift for Cinema 4D

The image below shows the advanced render settings of motion blur in Redshift. 

Let’s cover all the settings in Motion Blur and Shutter parts.

Enabled Motion Blur

Firstly, you should enable or disables motion blur in Redshift.

Note: All Redshift motion blur will be automatically disabled in the beauty render if you enable a Motion Vector AOV in your scene. Reason: this would be undesirable for a Motion Vector AOV.

Transformation Steps

Transformation steps control how many linear steps Redshift will use to simulate the trajectory of cameras, lights, and objects. And the more steps, the more accurate the trajectories will be. As a result, the motion blur will look smoother, but more memory will also be used.

Let’s see how Transformation Steps influence the render in the example images below. (Note: All renders come from the same animation. The only thing that changed was the Transformation Steps count.)

Image Credits: help.maxon.net

As you can see, the trajectory of the moving lantern is more appropriately rendered when increasing the Transformation Steps.

Deformation Blur

Enables or Disables deformation motion blur.

Deformation Blur tracks the motion of individual vertices. And it can be memory-intensive, especially for high-poly or displaced geometry. If your objects do not have animated deformation, you can leave this parameter disabled for increased performance. For more information, please visit this page.

Deformation Steps

This controls the number of linear steps that Redshift uses to represent the trajectory of moving vertices on deforming objects. Like transformation steps, the more deformation steps, the more accurate the trajectories will be, resulting in a smoother motion blur. However, this also causes more used memory

Frame Duration

Frame duration determines how many frames the camera’s virtual “shutter” will stay open for. As in real life, the greater this value, the more motion blur is produced.

Note: Because this setting parameter has to do with frame duration, it is affected by the animation frame rate in your modeling program.

Next comes the Shutter settings. These settings allow us to fine-tune the time range of motion blur for the specified frame range. (Note: 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 values, the shorter the blur, and vice versa. For this reason, the pair values of start/end at 0.0 & 0.5 and 0.5 & 1.0 will create the same amount of blur. (The value difference between them is 0.5 in both cases). The motion blur, however,  will be ‘offset’ near the start and end of the frame range respectively.

Start

Start sets the motion blur’s start point relative to the frame position within the frame’s duration. This value may range from 0.0 to 1.0. A value of 0.0 represents the very beginning of the frame duration, while the 1.0 value corresponds to the very end of the frame duration.

End

End sets the motion blur’s end point relative to the frame position within the frame duration. This value can also range from 0.0 to 1.0 as Start. While 0.0 corresponds to the very start of the frame duration,  1.0 represents the very end of the frame duration.

Frame Position

Frame position controls the motion blur’s offset relative to the rendered frame during the frame duration. There are three options: Start, Center, and End. 

      • Start: Starting motion blur at the rendered frame. For instance,  prior to the rendered frame, there is no visible motion.
      • Center: Centering the motion blur on the rendered frame. For example, motion is visible both in front of and after the rendered frame.
      • End: Ending motion blur at the rendered frame. For example, there is no visible motion blur from any frames after the rendered frame.

Below is a 100-frame animation. The rendered frame is frame 50. As you can see, the dragon is moving upwards and the motion blur frame duration setting is 50.

Image Credits: help.maxon.net

Efficiency

Efficiency setting controls how fast the shutter opens and closes. In reality, camera shutters open gradually rather than instantly. A setting of 0.0 causes the shutter to open as gradually as possible, whereas a setting of 1.0 causes it to open instantly (the default). The following picture demonstrates how the shutter efficiency parameter impacts the shutter opening speed.

As seen in the examples of the motion blur trails below, the shutter efficiency parameter influences how motion blur trails appear. If you set the Efficiency to 0, you’ll see that the motion blur trails look smoother.

Image Credits: help.maxon.net

Above are all the information regarding motion blur and it’s advanced settings in Redshift. Hope you find it useful for your rendering optimization.

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Reference source: help.maxon.net

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Hana Trieu

Hello everyone, I'm Hana, working as a Customer Support at iRender. Being interested in Computer Graphics, I admire CG artists around the world and always look forward to learning and sharing new things with them.
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