Depth of Field
Depth of Field (DOF) lets you focus the camera on a particular object, blurring those closer and further away from the camera's focal point. You can control the Lens Radius and Focal Length numerically or you can have Bryce calculate these values based on a selected object.
The Lens Radius determines how much or little of the scene is rendered with DOF. The larger this number, the more of the scene is blurred. The default Bryce Lens Radius is 0.10 which is usually too large for most renders. You'll probably find that 0.01 or 0.02 is more than enough DOF.
Focal Length determines the focus of the DOF - what the camera focuses on. You can set the focal length automatically by selecting an object and clicking on Set To Current Selection. To set the focal length manually, you need to determine how far the object is from the current camera.
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