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Clever usage can lead a viewer to certain parts of your image and increase photorealism by correctly mimicking a real-world lens.

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RenderMan provides controls for realistic and compelling images with depth of field. There are also options that are non-physical but great for creating art-directed imagery.


  • F Stop: Like a real camera lens, this setting controls the strength of the effect. Lower values increase blur while higher values decrease blur.
  • Ratio: Depth of field aspect.
  • Blades: This determines the shape of the bokeh effect. If you choose fewer than three sides (triangle) the bokeh will be circular.
  • Rotation: This controls the angle where sides meet for non-circular bokeh shapes (Number of Sides is greater than 2).
  • Roundness: Values from 0 to 1 make the shape bow or flex outwards making it more rounded. Values from 0 to -1 bow inwards and make for sharper points.
  • Density: This controls the brightness across the bokeh shape. 0 to 1 makes it brighter at the outer edge like a catadrioptic lens (look it up, quite interesting). 0 to -1 makes it brighter in the center and falloff towards the edges.

For more information on the various aperture controls, see Bokeh.


  • Distance: The distance to the object or location you want in-focus (sharp) measured in scene grid units. This is referred to as the Focal Plane.
  • Focus Object: You can also select an object from the scene to be your distance. RfB will use this value over the value set for Distance.

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