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A mid plane is constructed from 2 planes, as an "average plane" (average of centroid coordinates and ±average(abs(vectors)), so you can't dimension the flatness, for example (nor the angularity) because there're no hits inside.
When a feature is constructed from intersection or projection, it's constructed from perfect associated features, and not from hits, so you can't dimension the form, only the size (example : circle on a cone at a height).
If you construct from hits, the plane has its own limits in terms of dimensionning, but the associated plane has no boundaries (you can intersect it with another feature wherever you want, even if it's out of the cmm !)
It's really clear in my brain, maybe not in my text...
A mid plane is constructed from 2 planes, as an "average plane" (average of centroid coordinates and ±average(abs(vectors)), so you can't dimension the flatness, for example (nor the angularity) because there're no hits inside.
When a feature is constructed from intersection or projection, it's constructed from perfect associated features, and not from hits, so you can't dimension the form, only the size (example : circle on a cone at a height).
If you construct from hits, the plane has its own limits in terms of dimensionning, but the associated plane has no boundaries (you can intersect it with another feature wherever you want, even if it's out of the cmm !)
It's really clear in my brain, maybe not in my text...
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