As you can see Direction 2 curves are not normal to profile. But Normal To Profile is selected from drop down menu and displayed in call out. What does it mean now?
actually, those direction 1 curves do look to be normal to your direction 2 curves, at the points where they meet...
... (assuming they are on a plane).. they are normal to that parent plane
When Dir1 curve is selected "Normal To Profile" a pop up window appears. What does it mean?
it is letting you know that your direction 2 curves are NOT normal to your direction 1 curves, and that the difference from the normal direction will propagate along the curve.
..yeah,.. the sketches are not normal to be allowed tangent... here's a example of what it would need to be normal/tangent..
...maybe this will help?
If the profiles are 2d sketches (or planar edges/curves), the "normal to" is referring to the sketch plane or the plane of the curve. If the profile is a 3d spline or a non-planar edge or curve, the option isn't available.
If you are getting that error message, it means the constraints you have set up are contradicting the existing geometry. The feature may "work" (as in not fail), but it won't satisfy the constraints you have set.
It seems confirmation to Paul Salvador's explanation.
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