| I have found many things but not this very trivial! 
now i have visible this in movement - that is curious because my previous example seems make that!  
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i want visible in movement 
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So how draw in up and undraw in down ?
   
 i have refound it how to make that! :)
 
edit : sorry for the disturb! 
So from now i can make some funny things with a minimum native nodes! :)
 
Maybe a last difficulty will be to find a variating axes changing inside the object at each step for thing like twist, rotation etc  ...
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