Subject:
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Re: LPub4 Alpha3 available
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Newsgroups:
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lugnet.cad
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Date:
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Fri, 27 Jun 2008 22:23:05 GMT
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Viewed:
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6838 times
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In lugnet.cad, Kevin L. Clague wrote:
SNIP
>
> Are any of the matrix coefficients negative?
>
> Kev
Had a look and yes. I'n not sure quite why though, the sub model in question
consists of 2 headlight bricks side by side with a 1x2 grill tile across the two
side studs. It is used with the grill facing out on both sides of a train it
could be considered a mirror but at the same time it is also just a rotation.
Tim
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Message has 1 Reply:
 | | Re: LPub4 Alpha3 available
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| (...) Actually, the matrix can have negative coefficients without being a mirror. If I remember correctly, mirror detection is a matter of checking if the determinant of the matrix is positive or negative. If the determinant is negative, then the (...) (16 years ago, 28-Jun-08, to lugnet.cad)
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Message is in Reply To:
| | Re: LPub4 Alpha3 available
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| (...) Yes, this is part of the plan. (...) LPub has to consider the rotation matrix for each submodel. If the rotation matrix includes negative numbers, then we're talking about mirror images which should not be put together in one callout. (...) (16 years ago, 27-Jun-08, to lugnet.cad)
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