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In lugnet.cad.dat.parts.primitives, Don Heyse wrote:
> In lugnet.cad.dat.parts.primitives, Niels Karsdorp wrote:
> > When using the 2-4cyli primitive I noticed one conditional line missing, so I
> > compared all different cyli primitives. Some have conditional lines at both
> > ends, some have not.
>
> This thread pops up from time to time and never seems to get
> resolved.
>
> http://news.lugnet.com/cad/dat/parts/primitives/?n=350&t=i&v=a
>
> I think the problem is this: If you fix the all the primitives, then
> you really must check all the parts that use them. So we end up
> ignoring it and moving on. If you're truely motivated, you can
> fix all the cylinders to have conditional lines on both ends matching
> the red ones in Travis' diagram. But then the real work begins.
I checked a few official parts that use the 2-4cyli primitive.
And all the parts I have checked so far are missing the conditional line at one
end of the cylinder. So I suspect that part authors expect that all partial
cylinder primitives have conditional lines at both ends and don't check if these
have to be added to the part manually.
How bad is it when two conditional lines overlap?
I assume it is not a problem, since this will happen when a 1-4cyli and a
1-16cyli are used together (both these primitives have conditional lines at both
ends).
Often cones with irregular radii are created using different cones in a row.
When a 1-4con10 and any other 1-4con primitives are used together (like in part
6127.dat) the edge of the 1-4con10 is missing a conditional line.
Of all official primitives the following ones are missing a conditional line at
one end:
* 1-8cyli
* 2-4cyli
* 3-4cyli
* 3-8cyli
* 1-4con10
* 48\1-4con5
* 48\1-4con6
* 48\1-4con9
For consistency, I would say that these primitives are updated with conditional
lines at both ends.
Niels
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Message has 1 Reply:
 | | Re: cylinders missing conditional lines?
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| (...) Actually, if you use conditional lines that follow the red tangent lines, as in Travis' diagram, then you want them to overlap. You get partial coverage from each of them that adds up to the total coverage you'd get from the original style of (...) (20 years ago, 4-Nov-04, to lugnet.cad.dat.parts.primitives)
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