On 05/04/2016 12:09 PM, William F Pokorny wrote:
> 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.

Yep & sorry all. In rushing I posted two formats of the same image...

Perspective jpg attached.

Bill P.

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