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On Wed, 12 Jan 2000, John VanZwieten wrote:
> [SNIP]
> Type 5 lines are "optional" point A to point B line segments. Here's how
> they
> work:
> The first two columns are line type and color, as usual. The next 6
> columns
> are the x,y,x coordinates of point A and point B. Then the last 6 columns
> are
> x,y,x of points C and D, which are used to determine whether or not the
> optional line gets drawn. If, in the rendering view, points C and D lie on
> the same side of a line through points A and B, then the optional line gets
> drawn, otherwise not. Type 5 lines are used for curved surfaces so that only
This made me go look at the FAQ, and I found the following inconsistencies
in the FAQ.
in Topic "LINE TYPES" we have (the FAQ has):
> ...
> 0: comment or meta-command
> 1: Part-file reference
> 2: Line
> 3: Triangle
> 4: Quadrilateral
> 5: Draw a line between the last two points, if both points are on the
> same side of the line between the first two points.
which I think its wrong in the line starting with "5: Draw ...."
and further ahead in the FAQ (section "COMMANDS"), we have:
> Optional-Line command.
> Draws a line between the first two points, if the projections of both
> points onto the screen are on the same side of an imaginary line between
> the projections of the last two points onto the screen.
which is correct (IMO) and contradicts what was said earlyer, so I propose
that the first paragraph I mentioned should be changed to :
...
4: Quadrilateral
5: Draw a line between the FIRST two points, if both points are on the
same side of a line DEFINED BY the LAST two points.
P.S.
If agreed, can you do this Jacob ?
Rui Martins
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Making Ldraw Parts
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| Andrew Hull <taxihamster@hotmail.com> wrote in message news:Fo7G6D.oA@lugnet.com... (...) out (...) for (...) anyone (...) I started on a tutorial, but never finished it. Notably absent is an explanation of using primitives. Here's what I had (Tim, (...) (25 years ago, 12-Jan-00, to lugnet.cad.dev, lugnet.cad.dev.org.ldraw)
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