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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Tue, 17 Oct 2000 19:10:01 GMT
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Viewed:
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637 times
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In lugnet.cad.dat.parts, koen wrote:
> Hello,
> Does anyone have more information about those 9 numbers that make up the
> rotation matrix for a part in the dat file?
Could you be more specific?
> I would also like some information about edgelines.
Like what? Again, could you be more specific.
> especially those found in axlehol8.dat since i'm using those measurements to
> create my own flexible axes, yet haven't figured out more than how to draw
> triangles.
>
> Also , is there a limitation in filesize for ldraw parts?
There's no general limit.
> My file for 1 bendable axle is approximately 200 Kb.
> Here's what I'm talking about, it's about 7 pieces of the 100 used in one
> axle.
That looks very nice. It's not too surprising you're getting a big file.
Have you checked your file for duplicate or extraneous codes? That can
happen with big files.
A couple of things you might be able to do to control filesize:
0. Make each segment *really* short, and just use axlehol8.dat for each
segment.
1. Put repeated segments into a subfile. If you got a section of the part
that's got a fixed angle, each segment should be the same shape. If you
turn this segment into a subfile, you can reuse the subfile as much as you
want, while only adding one line to the main file.
2. One thing I've done with bent cylinders is to build each straight
segment out of two sloped cylinders with a regular cylinder in the middle.
Each segment ends up looking something like this:
_________
\ | | /
\|___|/
Except the sloped parts aren't usually that extreme. After each segment is
constructed, it's a simple matter of arranging the segments so the angled
ends meet cleanly.
This approach could work on a crossaxle, except that you would need to
construct the 'sloped crossaxle' subpart. And as long as you are either
bending in 2 dimensions, or you have a very regular curve.
Steve
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Message has 1 Reply:
 | | Re: rotation matrices
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| (...) Well, I copied the coordinates of one side of the axlehol8 dat. This gives me a plane that is perpendicular to the Y-axis. I then had to position this plane on points of the curves and perpendicular to that curve. To get the direction I (...) (24 years ago, 17-Oct-00, to lugnet.cad.dat.parts)
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Message is in Reply To:
| | rotation matrices [DAT]
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| Hello, Does anyone have more information about those 9 numbers that make up the rotation matrix for a part in the dat file? I would also like some information about edgelines. especially those found in axlehol8.dat since i'm using those measurements (...) (24 years ago, 16-Oct-00, to lugnet.cad.dat.parts)
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