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Note OpenRAVE still is maintained and actively developed, but moved to github some time ago (https://github.com/rdiankov/openrave). What is true is that there hasn't been a official release for some time, however.

How much time ikfast computation takes is highly dependent on the kinematics of your manipulator. There are cases where computation takes few microseconds (typically 6DOF arm, nicely intersecting axes) and cases where it takes a few milliseconds (dealing with complicated kinematics, more or less than exactly 6DOF). In the "hard" cases, the success rate often is lower, too (or the ikfast generator fails to generate a solution at all). These are rules of thumb however, you really have to test this for the kinematics you're looking at to be sure.