Subject:
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Re: Chrome Parts
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 8 Aug 2002 22:49:02 GMT
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Viewed:
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691 times
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In lugnet.cad, Steve Bliss writes:
> I generate them with LDLite, scaled up 3x, with thick edges. Then I run
> them through ImageMagick to reduce by 3x (and convert to gif). Finally, I
> 'batch convert' them with Paint Shop Pro, because ImageMagick doesn't
> compress the gifs (I assume there's a patent/licensing issue between Unisys
> and ImageMagick).
>
> It's the 3x reduction that blends the dithered pixels, resulting in smooth
> colors. The dithering was supposed to give some indication of the chrome-ness.
Looking at the images, it doesn't appear to matter much, but you might get
better results if your initial rendering were at 4x (or possibly even 2x).
The reason for this is that a 3x3 sample of a checkerboard pattern will
result in two slightly different shades. For instance, if the two blended
colors are blue and green, one pixel will sample 4 blue and 5 green, while
the pixel next to it will sample 5 blue and 4 green. If you did 2x or 4x
rendering, all the pixels would line up with the checkerboard and they would
all sample to exactly the correct color.
> I emailed Travis about the possibility of actually producing a chrome-like
> finish on parts in LDView, he seemed cautiously optimistic. But I'll let
> him explain what he was thinking, if he wants.
Hmm ... "cautiously optimistic" ... that's a pretty good interpretation of
my response :-). One thing I didn't mention in my response is that it will
almost certainly be a post-2.0 feature, assuming I get it working at all. I
think 2.0 is rapidly approaching, though; 1.9.6 had more bug fixes than new
features, I think, which is hopefully a good sign of stabilization.
Oh, and for LDView to be used in Partsref, I'm guessing you'd want to have
an orthographic mode (which is on my list of things to try).
--Travis Cobbs (tcobbs@REMOVE.halibut.com)
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Message has 2 Replies:
 | | Re: Chrome Parts
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| (...) Which leads us back to ldglite. Since I let opengl do the linewidths it supports 2x or 4x or even 2.5x (any floating point will do). On the other hand, while I think you'll be satisfied with the gold and silver colors, I'm not sure I (...) (22 years ago, 9-Aug-02, to lugnet.cad)
| | | Re: Chrome Parts
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| (...) Actually, my intent was that the color variation would simulate the variable appearance of highly reflective surfaces. (...) I sometimes often try to carefully choose my precise wordiage. (...) *Sigh*. OK, I'll stop holding my breath. ;) (...) (...) (22 years ago, 9-Aug-02, to lugnet.cad)
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Message is in Reply To:
| | Re: Chrome Parts [DAT]
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| (...) I generate them with LDLite, scaled up 3x, with thick edges. Then I run them through ImageMagick to reduce by 3x (and convert to gif). Finally, I 'batch convert' them with Paint Shop Pro, because ImageMagick doesn't compress the gifs (I assume (...) (22 years ago, 8-Aug-02, to lugnet.cad)
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