Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: rotation matrices
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Thu, 19 Oct 2000 20:43:44 GMT
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Viewed:
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808 times
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> I'm pretty sure that should be:
>
> A D G 0
> B E H 0
> C F I 0
> X Y Z 1
Are you really sure?
cause I looked at this file from Fredrik Glockner as an example about the
studs to ad in the beginning and end of my curve and it says:
1 16 -90 40 0 0 5 0 -1 0 0 0 0 1 STUD3A.DAT
1 16 20 0 -90 0 0 1 1 0 0 0 5 0 STUD3A.DAT
this would put the scaling factor 5 in the second row which is contradictory
to your explanation of scaling.
Or does LDraw uses colums for vectors?
I am confused now.
BTW, isn't this stud3A a little to big?
I mean, it doesn't fit inside a technic angle connector and those on my
supercar do.
Koen
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Message has 1 Reply:
 | | Re: rotation matrices
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| (...) No, the STUD3A has the correct diameter, 8LDU. The problem is the inside of the cross axle holes on the angle connectors. You'll note that a real life LEGO cross axle hole has a rounded internal cross section, which means that you can stick a (...) (24 years ago, 20-Oct-00, to lugnet.cad.dat.parts)
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Message is in Reply To:
| | Re: rotation matrices
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| (...) I'm pretty sure that should be: A D G 0 B E H 0 C F I 0 X Y Z 1 So multiplying (used fixed-pitch font for proper viewing): (x y z 1) (A D G 0) (B E H 0) (C F I 0) (X Y Z 1) gives (Ax + By + Cx + X Dx + Ey + Cz + Y Gx + Hy + Iz + Z 1) (...) (...) (24 years ago, 18-Oct-00, to lugnet.cad.dat.parts)
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