2009

Bias Changes the blurring so that it appears to derive more from frames before
or after the current frame. Range=0.01 to 0.99. Default=0.5.
By default, the blurring comes equally from frames before and after the current
frame; that is, a blurred object appears at the center of the blurred area. This
is the closest to what an actual camera would capture. Increasing the Bias
value moves the blurring behind the blurred object, in relation to its direction
of motion. Decreasing it moves the blurring in front of the blurred object.
Extreme values move most of the blurring very close to the blurred object,
which makes it difficult to see. For best results, use intermediate Bias values
in the range 0.25 to 0.75.
Pass Blending group
The multiple motion blur passes are blended by dithering, which you can
control by the parameters in this group.
These controls apply only to renderings of the motion blur effect, not to
previews in viewports.
Normalize Weights Passes are blended with random weighting to avoid
artifacts such as streaking. When Normalize Weights is on, the weights are
normalized, giving a smoother result. When off, the effect is a bit sharper but
usually grainier. Default=on.
Dither Strength Controls how much dithering is applied to the rendered
passes. Increasing this value increases the amount of dithering, and can make
the effect grainier, especially at the edges of objects. Default=0.4.
Tile Size Sets the size of the pattern used in dithering. This value is a
percentage, where 0 is the smallest tile, and 100 is the largest. Default=32.
Scanline Renderer Params group
These controls let you disable antialiasing or antialias filtering when you
render the multi-pass scene. Disabling these rendering passes can improve
render time.
These controls apply only to renderings of the motion blur effect, not to
previews in viewports.
Disable Filtering When on, disables the filtering pass. Default=off.
Disable Antialiasing When on, disables antialiasing. Default=off.
5238 | Chapter 18 Lights and Cameras