Question about surface control points . The way I modeled attached shape ( a small part of bigger model split by isocurves , shrinked) was :
- I drew outline of one half and center line with equal amount of points .
- Lofted the to curves “straight” to get two control point surface and arranged the curve control points .
- Changed the degree of the surface to U=5 V=3 .
- Mirrored the shape and raised the center 6 control points (three U from both sides) to get continuity and tweaked them to follow a curve .
- Added few knots to define the approximate shape I wanted .
As a result I have few unnecessary control point stacked very close to other points in center line that cause small warp in zebra and curvature analyses and they can’t be deleted .
I can join or match or merge the two halves , joined or merged it is watertight with no bad objects .
I can also stack some pair of points ( or all four pairs ) on top of lower pair of three highlighted pairs of points in the attached picture to reduce the warping .
The problem is probably the way I made the surface - closely stacked points in the start of the center line where the loft goes from vertical to diagonal and finally horizontal . I found a tutorial suggesting this , very easy and small amount of control points for easy shaping . In the actual model I added few knots where I needed more refinement after basic shaping.
Is there a way to delete individual surface control points afterwards or should I construct the shape other way (or try damage control with stacking control point pairs in top of other pairs) ?
Attached is the surface test 3dmRhino6_eval_test.3dm (203.9 KB) with zebra and surface analysis picture where the pairs of closely stacked control points are highlighted ( points on the center line) .