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1228 Chapter 15: Lights and Cameras

The f-Stop c an have a value less than 1.0. This is

not realistic in terms of an actual camera, but it

can help you adjust the depth of field for scenes

whose scale does not use realistic units.

Multi-Pass Depth of Field

Parameters for Cameras

Create panel > Cameras > Target button or Free button

>Parametersrollout>Multi-PassEffectgroup>Choose

Depth Of Field effect. > Depth of Field Parameters rollout

Multi-pass depth of fie ld

Top: Focus is in the middle distance, near and far objects

are blurred.

Bottom left: Focus on near objects, far objects are blurred.

Bottom right: Focus on far objects, near objects are blurred.

Cameras can generate depth-of-field effects.

Depth of field is a

multi-pass effect (page 3–76)

Youturnitoninthe

Parameters rollout (page

2–1218)

for cameras. Depth of field simulates a

camera’s depth of field by blurring areas of the

frame at a distance from the camera’s focal point

(thatis,itstargetortargetdistance).

You can preview dept h of field i n viewports.

Previewing mu lti-p ass depth of field in a shaded and a

wireframe viewport

Impor tant: This effect is for the default scanline

renderer. The

mental ray renderer (page 3–77)

has its

own depth-of-field effect. See

Depth of Field Parameter

(mental ray Renderer) (page 2–1227)

Tip:

To reduce the visible effect of multiple camera

passes, try sett ing the antialiasing filter to Blend,

withaWidthvalueintherange4.0to5.0,and

a Blend value in the neighborhood of 0.1. (You

choose the antialiasing f ilter and adjust its settings

in the

Default Scanline Renderer rollout (page

3–37)

.) Also, try reducing the Dither Strength

value,intheeffect’sPassBlendinggroup,tothe

neighborhood of 0.2.

Note: There is also a

depth-of-field rendering effect

(page 3–265)