[Sidefx-houdini-list] rotating a rotation

Ben Schrijvers ben.schrijvers at guerrilla-games.com
Wed Oct 18 05:35:56 EDT 2006


Hi Gerome,

Yes matrixes are your friend.. they are like the bacteria in your belly. You
didn't know they existed, it's scarres you once you know, but you would be
dead without them..
But in my case the matrix would only have 1's or 0's so that would be a
waist of precious matrix time.

a plus,
benS


-----Original Message-----
From: sidefx-houdini-list-bounces at sidefx.com
[mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of g m
Sent: Wednesday, October 18, 2006 12:16 AM
To: sidefx-houdini-list at sidefx.com
Subject: RE: [Sidefx-houdini-list] rotating a rotation

Well Matrix are scarry and they have a "cant be bother" look but they do 
solve a lot of problem. It  is just a matter to get your head around it. I 
think the way that ... ( sorry forget the name ) said could be the solution

Gerome.


From: "Ben Schrijvers" <ben.schrijvers at guerrilla-games.com>
Reply-To: sidefx-houdini-list at sidefx.com
To: <sidefx-houdini-list at sidefx.com>
Subject: RE: [Sidefx-houdini-list] rotating a rotation
Date: Tue, 17 Oct 2006 10:34:01 +0200

Hi Dan,

Uhm.. yes obviously it was the most obvious. Indeed same swapping and
inverting as the translate channels. I didn't swap the rotation order though
which made me think the solution would be a lot more complex and maybe need
a matrix.

Uhm.. I couldn't find it so I gave up hope already but anyone able to
confirm that you can't switch Houdini to a Z-up system?

Having fun over here? Well as my question is about DOP's and converting
coordinate systems you can geuss I do feel at home :-)

Cheers,
benS

-----Original Message-----
From: sidefx-houdini-list-bounces at sidefx.com
[mailto:sidefx-houdini-list-bounces at sidefx.com] On Behalf Of Dan Seddon
Sent: Monday, October 16, 2006 7:33 PM
To: sidefx-houdini-list at sidefx.com
Subject: Re: [Sidefx-houdini-list] rotating a rotation

Hi Ben

Hope you're having fun back in the Nether Netherlands.

If you can do a channel swapping trick for the translation you should be
able to do if for rotation too - though you'll need to swap the rotation
order around too. Without checking I would imagine you should
interchange your rotation orders in the same order you interchange each
of your transforms (given that you ts rs and ss should match too),
though you'll need to make sure you get your signs correct for the
rotations (which is determined by the handedness or your coordinate system).

Hop that gives you enough to play with, if you're not already there.

Dan

 > Hi there,
 >
 >
 >
 > I've got to rotate some channels that where generated in DOP's.
 >
 > As it's quite a simple rotation I can rotate the translation channels by
 > swapping them.
 >
 > But that doesn't work for the rotation channels.
 >
 > I've tried the Transform Chop which does give me new rotation values but 
I
 > can't find the right ones.
 >
 >
 >
 > Anyone?
 >
 > benS
 >
 > _______________________________________________
 > Sidefx-houdini-list mailing list
 > Sidefx-houdini-list at sidefx.com
 > https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
 >

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