[Sidefx-houdini-list] DOPS and scale

Alex Czetwertynski disciple1 at gmail.com
Tue Jan 18 16:50:24 EST 2011


Thanks for the answers...

What nodes are scene unit sensitive?

Thanks
Alex

On Jan 18, 2011, at 1:46 PM, Robert Kelly wrote:

> if your doing DOPs you want to set your unit scale before putting down
> any DOP nodes. They change values on the nodes that are scene unit
> sensitive on creation. So if your not careful you can make a scene
> with some values made for meters and some set for center meters.
> 
> On 18 January 2011 09:08, Michael K. O'Brien <mobrien at pixar.com> wrote:
>> Hola~
>> 
>> There are several constants in physics simulations that have dependencies on
>> distance that aren't exposed (like damping factors). If you try to do really
>> large or small scale simulations, float precisions starts to creep in as
>> well.
>> 
>> We usually scale the world down so something that is 1 unit == 1m when
>> possible. We've had problems with changing the units.
>> 
>> MO
>> 
>>> -----Original Message-----
>>> From: sidefx-houdini-list-bounces at sidefx.com [mailto:sidefx-houdini-
>>> list-bounces at sidefx.com] On Behalf Of Peter Bowmar
>>> Sent: Monday, January 17, 2011 8:19 PM
>>> To: sidefx-houdini-list at sidefx.com
>>> Subject: Re: [Sidefx-houdini-list] DOPS and scale
>>> 
>>> I believe 1 unit defaults to 1 metre and 1 weight unit is Kg (forget
>>> exactly). It's in the Preferences->Miscellaneous section. So the
>>> "smaller object" would have lower mass and therefor less force
>>> required to accelerate it.
>>> 
>>> Unless I've really badly forgotten my highschool physics :) in which
>>> case I blame the antibiotics...
>>> 
>>> Cheers,
>>> 
>>> Peter B
>>> 
>>> On 17 January 2011 19:00, Alex Czetwertynski <alex at franktheplumber.com>
>>> wrote:
>>>> When modeling objects to be used in DOPS, does one have to pay
>>> attention to scale?  I noticed a wind force had a much stronger
>>> influence on a smaller object, but I'm not sure what the rule of thumb
>>> is in terms of getting things to be in a good mid-range?
>>>> staying within the range of the initial grid maybe?
>>>> 
>>>> Thanks
>>>> Alex
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>>> 
>>> 
>>> 
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>> 
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