Subject:
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Re: New parts and color definition
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 10 Nov 2009 00:29:13 GMT
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Viewed:
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11987 times
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In lugnet.cad, Travis Cobbs wrote:
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In lugnet.cad, Michael Heidemann wrote:
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Please see also the comments about this issue on
http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/73435.dat
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The key thing I think should be brought away from those comments is the
original LDraw handling of transparent colors. Colors 32-47 are simply
transparent versions of colors 0-15. So, color 39 is a transparent version
of color 7 (light gray), and color 40 is a transparent version of color 8
(dark gray). This seems to have caused the following two problems:
- Real parts don’t come in those two colors, so one of the two needed to be picked for smoke. Prior to the creation of ldconfig.ldr, color 39 (trans light gray) was picked. (I think this is what happened; someone please correct me if I’m wrong on this.)
- When ldconfig.ldr was introduced (apparently in 2003) it included color 40, but not color 39, even though the official parts library at that time included parts using color 39, but no parts using color 40.
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Sorry if maybe I repeat something already said about color 39, but this is how I
recall it:
In Original LDraw, clear looked better with dithered lightgrey than white, so
James and I decided to use color 39 for window “glass”, instead of 47, which
would have been the more natural choise. We would rather look for the best
output than follow a strict protocol.
Now that noone I know of uses Original LDraw anymore, and I believe most
renderers would make better result using 47 for plastic “glass”, there is no
reason to stick to that old standard anymore.
Correct me if I’m wrong here, it was well over ten years ago...
/Tore
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Message has 1 Reply:
 | | Re: New parts and color definition
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| (...) This explains a lot of things - thx Tore for sharing. I'm going to discuss this in the LDConfig workgroup and see if we find a solution for the problem. w. (15 years ago, 10-Nov-09, to lugnet.cad, FTX)
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Message is in Reply To:
| | Re: New parts and color definition
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| (...) LDraw handling of transparent colors. Colors 32-47 are simply transparent versions of colors 0-15. So, color 39 is a transparent version of color 7 (light gray), and color 40 is a transparent version of color 8 (dark gray). This seems to have (...) (15 years ago, 9-Nov-09, to lugnet.cad, FTX)
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