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 18:57:23 GMT
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Viewed:
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310 times
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In lugnet.cad, Koen Jordens writes:
> 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.
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 cylinder.
Dan ;)
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Message is in Reply To:
 | | Re: Reiterate: How to make a squish matrix?
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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 (...) (25 years ago, 25-Apr-01, to lugnet.cad, lugnet.cad.ray)
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