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This node is for Depth Of Field (DOF) postprocess. Note, its not a true dependency node, it has attributes but no computePlug. DOF can be evaluated by calling computeDOF. Don't bother trying to hook this up in a network, it only makes sense when it is connected to the postProcesses node.

Node nameParentsClassificationMFn typeCompatible function sets
dofnodeauxiliary/camera:postprocesskDOFkBase
kNamedObject
kDependencyNode
kDOF