Subject:
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Re: Black seems wrong in ldconfig.ldr
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 13 Jan 2004 18:31:08 GMT
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Viewed:
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1746 times
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(I switched to FTX due to an unusually long link.)
In lugnet.cad.dev, Steve Bliss wrote:
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In lugnet.cad.dev, Travis Cobbs wrote:
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The ldconfig.ldr file currently being distributed with the parts library
seems to have the wrong definition for black. It uses 33,33,33 as the RGB
color, when the official color chart uses 51,51,51.
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(er, which official color chart?)
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I was referring to the one at ldraw.org
here (LDraw definitions at the bottom).
I believe that the LDraw color definitions there came from some version of the
LDraw FAQ. When I said “official”, I meant “official in the context of LDraw”.
I was under the impression that this chart met that criterion. I understand
that different color values are appropriate in different circumstances, but I
thought this particular one seemed like a reasonable choice for the ldconfig
file. If I’m wrong about this, though, that’s fine. Perhaps these colors are
simply the original colors used by LDraw itself. If so, they obviously don’t
make a particularly good color reference.
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Two things to note. First, 33,33,33 comes out quite dark, and (in my
opinion) 51,51,51 looks better. (It’s very difficult to make out any detail
with the 33,33,33 color.) Second, 33 is 51 in hex, so I think it was just a
mistake, and 51 was the desired value.
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Uh, Travis, it’s *black*. It’s *supposed* to be dark. People have
questioned/complained that it’s not ‘true black’ (ie, 0,0,0).
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I understand that on the computer, people have a tendency to want black objects
to be as black as their monitor can make them. However, when it comes to 3D
objects, this doesn’t work, as black produces a black region with absolutely no
internal detail.
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You might be right about the origin of the 33 value, but I believe I was using
that definition for black before there was an ‘official’ color chart. So
maybe the 51,51,51 value is a mistake. ;) Either way, I’m sure 33,33,33 and
51,51,51 are related as you said.
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I would be curious to know people’s opinion on this particular color. I think
that most (non-raytraced) rendering programs will produce a result where the
details are very difficult to see when using the 33 version of black. On the
other hand, if edge lines are turned on, then this doesn’t necessarily hurt
anything. I’m not sure what would look better in POV Ray, and it could well
depend on the radiosity settings.
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The bottom line is that the ldconfig.ldr file (and the color definitions it
provides) are a starting point, not necessarily the perfect colors for all
occasions. I’m open to applying tweaks to it, but I don’t think there is
really one set of values that will make everyone happy.
BTW, thanks for adding support for ldconfig.ldr to LDVIEW! :)
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You’re welcome. It turned out to be fairly easy, since I had recently redone my
color handling code to be more dynamic. Unfortunately, now that it’s there I
think I need a way for users to override certain colors, while not overriding
all colors. I haven’t decided yet whether to give the user control over which
ones get overriden.
I think black is a reasonably good example, but the metallic colors are even
better examples. My special lighting for metallic colors (only really evident
with specular is turned on in LDView) only work when ldconfig isn’t processed.
I think I’m leaning toward only having the ldconfig file update colors that I
haven’t already included settings for in LDView. Color definitions in model
files will always update the colors.
--Travis
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Message has 1 Reply:
 | | Re: Black seems wrong in ldconfig.ldr
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| (...) Why not use the optional MATERIAL bits from this old discussion (URL) come up with a modified ldconfig.ldr? Then implement some code in LDVIEW to enable your metallic lighting goodies when ldconfig.ldr contains the proper MATERIAL settings. (...) (20 years ago, 13-Jan-04, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Black seems wrong in ldconfig.ldr
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| (...) (er, which official color chart?) (...) Uh, Travis, it's *black*. It's *supposed* to be dark. People have questioned/complained that it's not 'true black' (ie, 0,0,0). You might be right about the origin of the 33 value, but I believe I was (...) (20 years ago, 13-Jan-04, to lugnet.cad.dev)
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