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# 1 08-01-2006 , 01:14 PM
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Join Date: Oct 2005
Posts: 37

Strange lofting problem between 3 curves.

Hi,

I'm doing a loft between the three curves in the first picture; they are all perfectly straight in z, but have curvature in y. The outer two curves are identical copies, and the center one is similar but with no hump in the middle. (They are the outer and center profiles of a skateboard.)
When I loft between them I get a strange bulging outwards which spills beyond the confines of the curves (See second picture.)

I've tried all the loft options settings to no avail. The problem is reduced if I ensure that all the curves have the same number of CVs, but it's still there a little.

In the end I found a workaround by doing two seperate lofts (curve1 -> curve2, then curve2 -> curve3).

But I'd really like to understand why it's failing between 3 curves???
I find that I use lofting a lot, so if someone could give a technical explanation of when it's likely to fail like this, I might be able to avoid some pitfalls.

Thanks

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