[Sidefx-houdini-list] Maya .anim curves in Houdini

Craig Zerouni craig at zerouni.com
Wed Feb 21 16:08:26 EST 2007


Does collada solve this problem? That would be (welcome) news to me.

CZ


Andrew D Lyons wrote:
> Yep - we have some tools to sample values out per frame, but ideally
> we can hand channels back and forth between Maya and Houdini once or
> twice with no (major) precision problems. We also don't want to bring
> in Maya key frame animation and hand back a sample per frame channel.
> Animators aren't going to be happty about that if they need to tweak
> some curves...
>
> Hmmm. Collada?
>
> Cheers
>
>
> On 21/02/07, Lucio Flores <dogboy_l at yahoo.com> wrote:
>>
>> --- Andrew D Lyons <tstexture at gmail.com> wrote:
>>
>> > Hi Lou,
>> >
>> > I implemented something like that, but when I was comparing sampled
>> > Maya and Houdini keyframes in CHOPS, I found minor numeric differences
>> > (+/-0.003 for extreme slopes). That's a big problem for camera
>> > rotation channels.
>> >
>> > I wrote the converter in python using functions from the math module.
>> > Python uses doubles exclusively, so I'm guessing the problem is deep
>> > somewhere in the keyframe functions, or the way they are evaluated.
>> >
>> > How accurate was the one you wrote, and how did you implement it?
>> >
>> > Cheers
>> >
>>
>> It worked enough that we could look at the raw values, and they would 
>> be dead
>> on. But come to think of it, when translating bewteen different 
>> packages, we
>> would always sample it down to a sample per frame, just to eliminate 
>> *any*
>> cause for suspicion. You could get something working 99% of the time, 
>> then at
>> the 11th hour, some characters are sliding against a plate or other 
>> elements,
>> and they call you into that meeting and everyone is sweating. It just 
>> buys you
>> a piece of mind for yourself, and it doesn't take up much disk space.
>>
>>
>>
>> -------------------------------------------
>>
>> God, how much more profitable would it be,
>> if the Thinker would learn from the Drunk?
>>
>>                                    - Kafka
>>
>>
>>
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>
>



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