On 05/03/2016 01:02 PM, clipka wrote:
> Am 03.05.2016 um 18:32 schrieb William F Pokorny:
>
>> And down the rabbit hole we go. :-)
>
> See what I meant when I said I wouldn't have the time right now? ;)
>

Certainly beginning to get the picture! Guess I'm still trying to figure 
out whether there is some tactical, near term parser checking changes 
that could be made to make the lathe more friendly to users.

To that end I have been working on test cases. I'm not done and work 
will slow as I have family in town for a long weekend starting later today.

However, I'll to post a couple images in response to your question about 
Lanuhum's lathe in particular. Here the blue are inside out and 
correspond to LanuHum's original ordering. The red have been flipped in 
order to the bezier spline.

The two rows at top have been modified so there are no negative 
coordinates in x but the shape still closes to x==0 at top and bottom. 
The bottom to rows are the original points.

So! Depending on the angle of the ray relative to the lathe, it looks 
like the x<0 control point does indeed sometimes cause a flip in normals 
at one end.

In other news the ordering of X as in Y can also flip normals - suppose 
expected mostly.

Bill P.

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