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after I did "Wanding&Solving" and "Setting the Ground Plane",I proceed the next step "The Skeleton Wizard", there are many extra markers in the space, especially when the actor is moving, but if I do not set the gound plane, this problem does not exist, can any body help me out,thank you!

Hello,
"Extra Markers" in your capture volume usually means that you did not wand the entire volume correctly. One of the Optitrack's dirty little secrets is you can get all excellents and still have issues...whereas if you get 5 greats and a good you might end up with great results. Make sure to wand the entire capture volume. Medium speed circular motions work pretty well. Stay within the volume when you are wanding and keep you body out of the way of the cameras as much as possible. Hope this helps.
Best Regards,
Andre O'Brien
Anakele Vision and Design

thank you very much，I wiil try that！