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In lugnet.cad.dev, Rui Manuel Silva Martins writes:
> 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
Yes the correction is needed. The first two point define the line, the last two
are the reference points.
Chris
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Making Ldraw Parts
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| (...) 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): (...) which I think its wrong in the line starting with "5: Draw ...." and further ahead in the FAQ (section (...) (25 years ago, 13-Jan-00, to lugnet.cad.dev, lugnet.cad.dev.org.ldraw)
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