Subject:
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Re: Parts for LDraw or parts for POV-Ray? (was: Re: i admit i was wrong)
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 13 Aug 1999 19:41:39 GMT
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Viewed:
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959 times
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Steve Bliss <blisses@worldnet.att.net> wrote in message news:37b46776.17418038@lugnet.com...
> On Fri, 13 Aug 1999 14:56:39 GMT, "John VanZwieten"
> <john_vanzwieten@email.msn.com> wrote:
>
> > IMHO, the improvement to the POV output justifies modeling curved edges where possible. The baseplate with hard edges just won't
> > have that picture-perfect quality, even though it will be fine for LDraw.
>
> I disagree on this point.
Perhaps we should take this debate to a more appropriate group: lugnet.cad.dev.on-topic :-)
> LDraw parts should be primarily focused on optimizing rendering in
> LDraw-tools. Among other things, this means that small-radius curved edges
> are better drawn as sharp edges. Heck, when you get right down to details,
> *all* edges on LEGO parts are rounded. So what's the cut-off radius?
In general the cut-off for details is 1 LDU, or so I've been told. For small-radius curves, 2 LDU might make more sense in some
situations. The baseplate in question probably has curves of radius > 4 LDU, just guessing from memory.
> IMO, for LDraw parts, if a detail is shown in LEGO instructions, it should
> be part of the LDraw part file. If a detail is explicitly skipped in LEGO
> printed instructions, it can be skipped in the LDraw part. This is a
> guideline, not a hard-and-fast rule. There are too many differences
> between the two media (printed instructions and LDraw renderings) for
> everything to be identical.
This certainly makes sense as a guideline. Those click-hinges are shown squared off with edgelines--but then again they're also
shown with a hole all the way through the indentations. I'll have to go look at the instructions for the Ice Station Oddessy.
> High-quality parts should be modeled directly in POV-Ray. There are
> details that can be captured in POV-Ray that would never be practical in an
> LDraw file. For example, those rounded edges have been part of raytrace
> libraries since at Paul Gyugyi's L3G0.
>
> And this leads us back to the tantalizing, captivating possibility of
> L3P-meets-L2P. Oh, if only it were so. Hmm, did Lars publish the source
> to L3P? Hmm. No, I'm too busy this year. Maybe *after* the next update
> to LDAO is put to bed.
That would be pretty awesome. I started with POV only after L3P was introduced, so I've never taken the time to set up L2P. But
the idea of using those truly quality parts with the limitless possibilities of L3P is certainly intruiging.
-John Van
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Message has 1 Reply:
 | | Re: Parts for LDraw or parts for POV-Ray?
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| (...) Good idea, we shouldn't be discussing this in lugnet.flame.flame :) and Steve said: (...) I've done that to LeoCAD a few months ago, when you export a file to POV-Ray it first searches the LGEO library for the parts and then if it cannot find (...) (25 years ago, 13-Aug-99, to lugnet.cad.dev)
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