Subject:
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Re: Reiterate: How to make a squish matrix?
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Newsgroups:
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lugnet.cad, lugnet.cad.ray
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Date:
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Wed, 25 Apr 2001 18:10:07 GMT
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Viewed:
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32 times
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that shouldn't be too hard either.
just operate the matrix on the points alone.
if your cilinder has it's axle around the Y axle.
L is the length of the cilinder
and if it starts at 0 0 0
you could use
(1-y/L) 0 0
0 1 0
0 0 (1-y/L)
this would turn the top circle located at y=L into a point and the bottom
circle would remain the same.
if you can actually do this in the program of your desire i don't know but
if you create your own C program it is possible .
Koen
Sproaticus <jsproat@io.com> schreef in berichtnieuws
GCCwzv.LBt@lugnet.com...
> In lugnet.cad, Steve Bliss writes:
> > Yes, but it's not what Sproat needs.
> > He needs to scale X and Z as a function of Y. Something like:
> > x' = xy
> > Which is something transform matrices cannot do.
>
> Yah. Bummer.
>
> Thanks, though, to Dan and Steve.
>
> Cheers,
> - jsproat
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Message has 1 Reply:
 | | Re: Reiterate: How to make a squish matrix?
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| (...) Yes, but you cannot put (1-y/L) into a transformation matrix. It is a *function* that changes for each 3D point. The purpose of a tranformation matrix is to precalculate a matrix of *numbers* that gets multiplied by all the points of the (...) (24 years ago, 25-Apr-01, to lugnet.cad, lugnet.cad.ray)
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