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Subject: 
Re: Reiterate: How to make a squish matrix?
Newsgroups: 
lugnet.cad, lugnet.cad.ray
Date: 
Wed, 25 Apr 2001 00:20:58 GMT
Viewed: 
816 times
  
i thought you just had to multiply your matrix with something like
1 0 0
0 2 0
0 0 1

this would make Y 2 times as long.
Not?

Koen


Don Heyse <dheyse@hotmail.spam.go.away.com> schreef in berichtnieuws
GCBD52.3qI@lugnet.com...
A quick keyword search turns up this page which states that it is NOT
possible (in one of the first few paragraphs).


http://www.google.com/search?q=cache:enphilistor.users4.50megs.com/matrix.ht
m+matrix+cylinder+cone+shear&hl=en

Sorry,

Don


In lugnet.cad, Jeremy H. Sproat writes:
In lugnet.cad, Jeremy H. Sproat writes:
Is there a way I can make a matrix that will "squish" an object?

Whoops!

Thank you Rui for helping me straighten this out -- I'm not doing this in
LDraw.  I'm just looking for a way to do this with a 4x4 matrix.  My • target
app is POVRay, but I figured this question would be generic enough for
people in the .cad group.

So, to reiterate:  I'm looking for a 4x4 transform matrix that "squishes" • an
object; e.g. a cylinder into a truncated cone.

I don't know if it's possible to get this transformation from a matrix. • I
thought I've seen one before, but I can't find any reference to one now.

Cheers,
- jsproat



Message has 1 Reply:
  Re: Reiterate: How to make a squish matrix?
 
(...) 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. Steve (24 years ago, 25-Apr-01, to lugnet.cad, lugnet.cad.ray)

Message is in Reply To:
  Re: Reiterate: How to make a squish matrix?
 
A quick keyword search turns up this page which states that it is NOT possible (in one of the first few paragraphs). (...) (24 years ago, 24-Apr-01, to lugnet.cad, lugnet.cad.ray)

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