Le 17/10/2012 15:40, HenryW a écrit :
> The first one consists of a lathe object shaped into a bulb, referenced with a
> negative scale component to create a hourglass shape then a scaled down version
> (0.995) is differenced from it. You can see banding which looks to me as if the
> glass does not have a uniform thickness.



Hint: if you scale, the object get a dilatation.

E.g. Value of 1 scaled 0.995 becomes 0.995
Value of 10 scaled 0.995 becomes 9.95
Value of 100 scaled 0.995 becomes 99.5

Width at 100 / scaled : 0.5
width at 10 / scaled : 0.05
width at 1 / scaled : 0.005

If you want a constant "horizontal" thickness, you need to translate the
curve of the lathe BEFORE rotating it. (assuming a vertical axis for the
lathe / sor )
(it's only horizontal : the slant of the curve might very well impact
the overall perception of thickness, you would need to draw a second
curve using fixed-width-discs along the first curve to really have a
uniform thickness: I can do it on a paper, but it's a nightmare to
program that for all possible curve )

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