Subject:
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Re: [LSC] Colour Definition meta-statement
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 6 Feb 2004 03:23:05 GMT
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Viewed:
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1690 times
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In lugnet.cad.dev, Travis Cobbs wrote:
> Specifically, I think it would be a royal pain to support color scoping on a
> line-by-line basis in a file. And to be perfectly honest, it doesn't really buy
> you anything in real life. How many people are going to use a color number
> early in the file and expect one color, and then re-define that number later in
> the file and then use it to represent a different color?
Actually, I was considering the possibility of (patterned) parts including custom
color definitions, which would only apply to that part.
> I also have a question. How do the scoping rules interact with color 16 and
> color 24? Specifically, if you define color 42 to be green in file A and file A
> is drawn in color 42 from file B, does the color definition hold if file A
> contains items drawn in color 16 or 24? I would say that it shouldn't, because
> the file B has no way of knowing that color 42 is going to be re-defined, and
> the file A has no way of knowing that it is going to be rendered with color 42.
That's a good question. Think about this: what if file A also has some surfaces
hard-coded to color 42. Should those lines be drawn with definition 42A or 42B?
I suspect a relatively simple solution is to pass complete color definitions to
subfiles, instead of a simple color code. The subfile doesn't really care if it's
drawing with color code 6 or 60, it just uses what it's given. That's really a
necessity for any renderer (like LDLite or MLCAD) that supports direct colors (ie,
allowing models to specify RGB values in place of color codes).
Steve
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Message is in Reply To:
 | | Re: [LSC] Colour Definition meta-statement
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| (...) When I first read, this, it seemed reasonable, but probably difficult to implement in a renderer. The more I think about it, though, the more I think the difficulty outweighs the niceness. Specifically, I think it would be a royal pain to (...) (20 years ago, 28-Jan-04, to lugnet.cad.dev)
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