Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: HELP: transformation of primitive causes BFC to stop working
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 18 Dec 2002 15:55:25 GMT
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Viewed:
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400 times
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In lugnet.cad.dev, Lance Hopenwasser writes:
> In playing with making a part (3648) BFC certified I have ran into a
> problem. The following line is in the original file:
>
> 1 16 10 10 2 0 0 8 8 0 0 0 1 0 2-4ndis.dat
>
> This line transforms the primitive such that the front face is inside the
> part (I'm using L3Lab with mytest6 option turned on to check BFC). Rather
> than use the INVERTNEXT meta-command, since the primitive is in a single
> plane (and just to test my knowledge of how the transformation matrices
> work), I decided to try flipping it over:
>
> 1 16 10 10 2 0 0 8 -8 1 0 0 0 0 2-4ndis.dat
>
> Unfortunately, this causes L3Lab to turn the primitive blue (indicating BFC
> not working at all). I am sure I am doing something wrong, but I am not
> sure what (although the fact that the last triad is all zeros strikes me as
> a little suspicious). Any help on this would be very much appreciated.
>
> Thanks!
> --Lance--
I think this line is what you want:
1 16 10 10 2 0 0 8 -8 0 0 0 -1 0 2-4ndis.dat
Let me know if I'm right.
-Orion
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Message has 1 Reply:
 | | Re: HELP: transformation of primitive causes BFC to stop working
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| Yep, that did the trick. Now that you gave me the coordinates, I can see that I wanted the original y vector (0,1,0) to go to -z (0, 0, -1), instead of staying y like I had it. This rotating and scaling stuff can be kind of tricky to visualize, (...) (22 years ago, 18-Dec-02, to lugnet.cad.dev)
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