Animation Settings and Motion Blur

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Animation Settings and Motion Blur

Postby abreukers » Tue Oct 17, 2017 11:09 am

abreukers Tue Oct 17, 2017 11:09 am
(Standalone Edition v3.06 and v3.07)

The Animation Settings Node is used to control the shutter interval which is specified relative to the frame time that is set in the time slider via the FPS option. The node exposes the attributes at which shutter time, shutter alignment and subframe portions in animated frames set. In turn, these attributes control blurring effects in animated frames and also affects the look of a volume that has motion blur.
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Motion Blur In OctaneRender
Blurring is a phenomenon common in photography especially when capturing fast-moving objects, it may result either when the camera has moved thereby the focal point when the camera shutter opened is no longer the same by the time the shutter is closed (camera blur) or when the object is moving too fast that the camera’s shutter speed is not fast enough to capture a sharp image of it (object motion blur).
In CG where objects are simply modelled and rendered, the images may be all sharp since the computer is actually able to generate all frames. Blurring effects are generally simulated through a variety of settings during the rendering.
In OctaneRender Standalone, blur effects are applied through the Animation Settings Node and there needs to be animated geometry provided by an alembic geometry scene node.

The timeline contains the following:

Frame Rate
Specifies the number of frames per second, where a frame is a rendered image each processed and shown consecutively to simulate motion within a scene.
Slider units
Specifies in which units the time slider is displayed with, the time slider units can be in frames (the frame number), or in units of time (in seconds).
Time Slider
This provides the user a view of the entire length of the animated scene and allows the user to specifically inspect a frame along the animation.

Additional attributes are provided by the Animation Settings Node.

Shutter Alignment (Trigger)
The shutter alignment specifies how the shutter interval is aligned to the current time.
This determines when the camera shutter is triggered. This can be before, symmetrical or after, and applicable to each frame thereafter relative to the given frame rate.

Shutter Time
This specifies the shutter time percentage relative to the duration of a single frame. Shutter Time controls how much time the shutter stays open, this can be set to any value above 100% manually.

Subframe start and Subframe end (Subframe interval)
Specifies the approach, in terms of proportion (%) to simulate the camera’s shutter speed for that particular frame. Subframe start and end percentages are used to only render a portion of a particular frame. So if the scene has a lot of motion blur, users can choose to render only a piece of that motion blur, and then shift the start and end times. That way users need not rebuild the geometry at all. 0% to 100% is the whole frame (Default).
These two pins, subframe start and subframe end, allow users to reduce the rendered shutter interval to a sub-interval. This is useful if there is a need to double or triple the frame rate without having to re-compile the scene 2 or 3 times more often. In the Standalone, this can be done very easily by increasing the subframes value in the batch render script.

For example, Given that Shutter Time = 100%, the shutter is open during the entire frame:
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