Editing General Tree Walker

There are currently several slightly different functions to recursively walk the CSG tree. This task would be to implement a new tree walking function capable of replacing them all and altering software that uses the old walkers to use the single new unified one.

Requirements
*Familiarity in C
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 There are currently several slightly different functions to recursively walk the CSG tree. This task would be to implement a new tree walking function capable of replacing them all and altering software that uses the old walkers to use the single new unified one.
-Time would be spent carefully designing a new interface that has the appropriate hooks and callbacks so it could replace all of the existing routines.  Then time would be spent updating and testing all of the various walkers as they're replaced with your new traversal routine.
+Requirements
+*Familiarity in C
-This one is prime for test-driven development.  Show what the interface will look like for a variety of cases, then implement to that interface.
-=References=
-* src/librt
-* include/raytrace.h (grep for tree or walk or recurse)
-=Requirements=
-*Familiarity with C