[Sidefx-houdini-list] rotating a rotation

Peter Robbinson probbins at corefa.com
Tue Oct 17 09:30:02 EDT 2006


I vaguely remember many moons ago you could switch what axis is up in 
one of the startup scripts.
I could be imagining things though.

PeterR

Ben Schrijvers wrote:

>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
>>
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>>
>
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>

-- 
Peter Robbinson
Trainer
robbinson at coredp.com
probbins at corefa.com

Core Digital Pictures
http://www.coredp.com/




								"gravity is not a force, it is a boundary layer"
                                                                           "everything is coincident"
                                                                    "Love: a state of suspended anticipation"




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