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Blur Rendering Effect 257
Object before and a fter adding midrange Blur effec t.
Inter face
Blur Parameters rollout, Blur Type panel
Unifor m—Applies the Blur effect evenly across the
entire rendered image.
Pixel R adius—DeterminestheintensityoftheBlur
effect. Increasing the v alue increases the number
of surrounding pixels that each pixel will use to
compute its bl ur. The more pixels used means a
greaterblurfortheimage.
Affect Alpha—Applies the Uniform Blur effect to
the alpha channel when turned on.
Directional—Applies the Blur effect in any direction
according to the Directional parameters. The U
Pixel Radius and Trail blur the pixels horizontally
while the V Pixel Radius and Trail blur the pixels
vertically. Rotation is used to rotate the axis of the
horizontal and vertical blurring.
UPixelRadius—Determines the horizonta l
intensity of the Blur effect. Increasing the value
increases the number of surrounding pixels that
eachpixelwillusetocomputeitsblur.Themore
pixels used means a greater horizontal blur for the
image.
U Trail—Adds “direction” to your blur by weighting
more blur to either side of the U axis. This adds a
streaking effect and creates the illusion that your
objects or your camera are rapidly moving in a
part icular direction.
VPixelRadius—Determines the vertical intensity
of the Blur effect. Increasing the value increases
the number of surrounding pixels that each pixel
will use to compute its blur , and creates a greater
vertical blur for the image.
V Trail—Adds“direction”toyourblurbyweighting
more blur to either side of the V axis. This adds a
streaking effect and creates the illusion that your
objects or your camera are rapidly moving in a
part icular direction.
Rotation—Rotates the axis of the U and V pixels
that will be blurred by the U and V Pixel Radius
spinners. By using Rotation with the U and V
Pixel R adius spinners you can have the Blur effect
applied to any direction in your rendered image.
When rotation is 0,Ucorrespondstotheimage’s
X axis and V corresponds to the image ’s Y axis.
Affect A lpha—Applies the Directional Blur effect to
the Alpha channel when turned on.
Radial—Applies the Blur effect radially . U sing
the Radial parameters you can define a point
w ithin your rendered image to u se as the center
of the Radial Blur. You can use an object as the