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Thanks MrCATIA for your reply. I`m not professional enough to understand and answer your question (Have you joined each track to form 3 continuous curves?). appreciate if you make it more clear for me.
I`m trying to create movement (slide roll) but the cylinder stop rolling on the black dots and continuous to rotate on the track. i guess the reason is the black dot.
I did another example and made the track like a closed circles and no dots appeared then the roller was able to rotate on the track.