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How to make a plane well defined before, always well defined after ?

Question asked by Pet Peever on Sep 6, 2012
Latest reply on Sep 7, 2012 by Alin Vargatu

I thought at first that offsetting a spline of 10mm would be easy and smart to modify a whole part.


It's awful, with this SW12.


I define a plane with 3 points.


I make after that a surface cut.


So, 2 points out of 3 are eaten with this cutting.


And then, the plane turns out in red : "the point to define the construction plane is no longer in the model !!!!"


What is this kidding ? Of course the point is in the model, since there is a surface cutting of something, the something appearing on my screen.


So how can I keep up this plane, after any cutting ?