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Optimization

Simple (?) Problem finding a distance from a B Spline Surface

Oliver D
Posted 9 years ago

Hi all, I'm having a problem with the following code. I have a list of points (conpts) to build a BSpline Surface. I want to find the minimum distance of that surface from a given ponit (test). NArgMin works on the norm of the surface, but not when substracting a vector "test" (last line). Why not? Any help would be welcom!

RScreeshot
POSTED BY: Oliver D
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I get the same problem (of course with different data)! I checked the bspline function with ParametricPlot3D to make sure there were no kinks, intersections or such that would spoof NArgMin (NMinimize). Also tried defining/submitting: func[u?NumericQ, v?NumericQ]:= Norm[...] to NArgMin to no avail.

POSTED BY: Frank Iannarilli 
func[u_?NumericQ, v_?NumericQ] := Norm[srffn[u, v] - test]
POSTED BY: Frank Iannarilli
Oliver D
Oliver D
Posted 9 years ago

Thanks, Frank! Seems like a bug. All I can do is write a manual loop to minimze the distance from a test point to the surface. Back to low level programming! :-(
POSTED BY: Oliver D
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