Subject:
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Re: Flattened Primitives (was Re: 1x1 and 2x2 chess sets)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 3 Mar 1999 18:25:57 GMT
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Viewed:
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1649 times
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On Wed, 3 Mar 1999 16:36:43 GMT, "Lars C. Hassing" <lch@ccieurope.com>
wrote:
> Steve wrote:
> > What'd be *really* great is if the substitution wasn't hard-coded in
> > L3P, but was stored in an external file. That way, LGEO (or even
> > L3G0) parts could be easily substituted in for LDraw parts, if the user
> > was willing to go through the work of editing the translation file.
>
> It's not that simple. Together with the POV substitution string I also
> have other data like the BoundingBox of the primitive, which is used
> e.g. in the automatic camera positioning. I think it is troublesome
> to have this kind of info in the external file too.
(I didn't claim it would be easy) Of course, the more information
stored in a translation, the harder it is to customize. And load into a
program to use the information.
> > Let's see: L3P reports four other part files with singular matrices:
> > 352.dat, 6043.dat, 4285.dat, and 3741.dat. I think these may be
> > mistakes -- in each case, the singular matrix is flattening either a
> > N-Mcyli.dat or stud4.dat. Even if they aren't mistakes, there are
> > other ways to write those codes.
(BTW, I meant 'mistake' as in a typo or a sub-optimal approach to
modeling.)
> I think they are mistakes too.
> Actually there are lots of singular matrices! So many that I decided
> not to burden the innocent user. L3P has a list over xz-primitives
> (like 4-4disc.dat) and silently fixes singular matrices for these
> primitives. You can see warnings for this if you run "l3p -check -w3"
> "WARNING \"%s\" Line %d: Row %d all zeros: %s"
> "WARNING \"%s\" Line %d: Y column all zeros: %s"
Ah. I thought there would be more than four instances of this behavior.
> I don't like having this list (and having to keeping it up-to-date),
> but it seems that many part authors are lazy or ignorant and write
> lines like "1 16 x y z 10 0 0 0 0 0 0 0 10 4-4disc.dat"
Lazy? Ignorant? That would be an oversimplification. LDraw doesn't
care about the extra zeroes, it happily crunches the numbers anyway.
And it seems like the FPU might occasionally short-cut multiplications
by 0, thus speeding up rendering (that's just a guess on my part).
> If L3P didn't fix these lines, you would just have a lot of warnings
> from POV, which would only confuse the ordinary user. The goal of
> L3P is to not have POV issue any warnings at all.
> Please let me know if you experience any.
I'll be sure to.
Steve
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