Hello,
I was was trying to follow Kyle’s tutorial on the pocket knife modeling. I did everything according to what he did but when I blended the upper and lower surfaces I got an extreme amount of points.
Ive included screen shots up to that point, what am I doing wrong?
Thanks,
John
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There is a bug which was reported in a previous thread:
How to turn off Isopram control points? Rhino 8: Pocketknife - #2 by theoutside
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this should be sorted for the 8.24 service release.
in the meantime, if you use odd numbers of control vertices in your surfaces it works without the complex rebuild- I just happened to use 9 cv’s per surface by chance or I would have hit this same bug while making the video.
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Thanks Kyle
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Tried it with 11 CVs and got the same result. Hopefully the next update will take care of it.
try shrinking the surfaces to make sure there are no extra points in the surface.
(split by iso makes 2 trimmed surfaces)
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Unless the option Shrink=Yes is set in Split when splitting by an isocurve. Then the results are automatically shrunk.
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Ran shrink trimmed surface and got the same result. Why is it reversing the UVs?
Sorry for all the dumb questions, I’m old and still trying to teach myself.
Thanks Kyle,
John
Hey Dave,
Getting the same results no matter what I do.
Thanks for getting back to me.
John
this was my experiment which uncovered the bug-
blend weirdo.3dm (366.9 KB)
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Weird, and it seemed to reverse the UVs on yours also or am I wrong?
there is a lot of weird going on here… 
grab 8.24 when it comes out and try it… this should be sorted in that release.
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OK thanks
Hey Kyle,
I just updated to 8.24 and the same thing happened trying to follow your pocket knife tutorial.
Attached are screen shots and when I added a straight shape, it transformed the object. Looks like they didn’t fix the bug.
Thanks
No the top and bottom point count is very low.
try rebuilding them so they match
Hey Kyle,
Attached is the knife I was trying to build. The points match up but I’m still getting the same results. Could it be because some of the vertices are inside the curve?
Thanks agin,
John
(attachments)
pocket knife.3dm (2.99 MB)
you have 2 trimmed surfaces. (_pointsOn or _untrimAll shows ist)
delete one of the 2 surfaces.
_untrimAll the remaining surface (you have back the originial surface)
_split IsoCurve Shrink = Yes Important: Snap with (Knot) at the iso-curve / edge.
now _blendSrf will do the job as expected:
pocket knife_tp.3dm (3.5 MB)
Hey Tom,
Thanks for getting back to me so soon! I did what you instructed and saw there were to surfaces one on top of another. I split it again at the seam and at the end of the opposite isocurve but the same thing happened. What am I doing wrong? File attached.
Thanks,
John
(attachments)
pocket knife.3dm (3.18 MB)