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In lugnet.cad.dat.parts.primitives, Steve Bliss writes:
> In lugnet.cad.dat.parts.primitives, Travis Cobbs wrote:
>
> > Well, based on comments in some other threads, I came to the conclusion that
> > the type 5 lines I had around the edge of my original primitive where wrong.
> > I have now updated them accordingly.
> >
> > This version is the same as the last other than that. The only difference
> > lies in the control points that hang out in space off the edges of the
> > sphere. In the previous version, I used a continuation of the sphere for
> > these control points. In this version, I used a point projected along one
> > of the axes.
>
> Is that true for all three edges of the sphere?
Yes. The standard sphere primitive has type 5 lines on all three edges.
They are all necessary in order to work right (with the axis-aligned edge
control points). My updated type 5 lines project along a different axis for
each edge, of course.
> [snip]
> > 3 16 1.000 -0.000 0.000 0.991 0.000 0.131 0.991 0.131 0.000
> [snip]
>
> I thought you were generating to 4 decimals? You know, like this:
>
> > 5 24 1 0 0 0.9914 0.1305 0 1 0 -1 0.9914 0 0.1305
> [snip]
Now don't I feel stupid :-). Especially given that not having the edges
exactly match the triangles would lead to rendering problems. I have posted
a fixed file as a reply to my original message.
For technical reasons, I can either generate the triangles or the type 5
lines with my code, but not both at the same time. The reason for the
screwup is that I used a previously generated file for the triangles, and
newly generated file for the type 5 lines and then just pasted the two files
together. Obviously the original file was generated with different accuracy.
--Travis Cobbs (tcobbs@REMOVE.halibut.com)
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