This is a single surface but zebra stripes are not smooth. In the next screenshot shows same surface but seems smooth. Which is the true surface quality?
Depending on how critical your evaluation is for either aesthetic(visual). tactile (touch) or engineering (optics/friction),..Evaluating the curvature, topology or smoothness of a 3d surface will vary and combining the below can help with understanding what you see (subjective) and don't see (analytical).The Zebra Strips (horizontal/vertical) or using a Image/Environment (very helpful. imho) are a quick visual references.The Curvature (colors, radius of curvature) helps with how flat (black) and generally smooth (green or blue) the radial slopes of change are more drastic (red).The Surface Curvature Combs can be very helpful with graphical sectional changes.. the more dense.. the more critical.
anyhow.. the above surface you show is not very nice in either.. the zebra strips show a lot of distortion or tension... you want relaxed strips.
I think this is denpendig on the accuracy of the stripe . When you start to display the zebra stripes, you'll find some settings. The 3rd slider is for the accuracy -> drag it a little more to the right and you'll be fine.
Works for me and my surface.
Try to use Face Curves - perhaps 10 in each direction. If you show curvature comps on those, you might get an idea of the surface quality.
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