[Sidefx-houdini-list] DOPs

Sean Lewkiw sean.lewkiw at framestore-cfc.com
Fri Mar 31 05:14:25 EST 2006

I'd have to agree with Ben. 

What DOPs really needs is more documentation, (the usual refrain).  One 
other problem we came up against was how to break things up, Ben put 
together a clever cookie based DA that worked well, but it's still a 
huge pain.  He also came up with a stamping based way to loop through 
all your primitive groups and perform operations on them, (so, for 
example, you can orient all of your geo along an axis so that the SDFs 
can be created nicely, or to replace your high-res geo with bounding boxes).

Some things do need to be a lot easier, like telling DOPs when to 
release something into a sim.  It's possible now, but again, not easy.  
There also needs to be some way to pre-flight geo to make sure it is not 
going to freak out when it gets released into a sim.

Having said all that, it does provide really nice, realistic, and 
relatively fast results once everything is set up. 


Ben Schrijvers wrote:
> Hi Rafal,
> Yes a one click solution would be very wrong. What if you have 500+ 
> objects, do you really want to do 500+ clicks?
> DOP's have been set up to be input independant so you can set up a sim 
> network without knowing exactly how the final input objects look.
> So a setup that works with 3 objects will work with 300 as well, you 
> just change the input. This is in line with the rest of Houdini.
> Because of that you only need to do the setup one time and just reuse 
> the same network later to do other sims.
> I must admit that in the learning process over the past months I've 
> gebuild my DOP networks a couple of times. But once you know what 
> you're doing that's no problem.
> Actually the biggest part of the setup was done in SOP's. Creating 
> primitive groups and finding ways to process each group as a single.. 
> chunk of geometry.
> Setting attributes that where used in DOP's to trigger something or 
> set initial parameters.
> We didn't do a lot with constrains... yet. They do seems a bit strange 
> but I can't compare with other 3D apps.
> Check out Xmen3 when it comes out. There's some large scale 
> destruction that we used DOP's RBD for.
> We were not planning to do a lot but as people saw the result we were 
> overloaded with work.
> cheers,
> benS
> rafal wrote:
>> Hi people.
>>    I would like to hear your opinion about new dynamics in Houdini. I 
>> have much more experience with other 3d app but really would like to 
>> do some cool stuff with DOPs but... After few days of playing with it 
>> I get enough. Maybe it's just me but in my opinion it takes too much 
>> time to set all these stuff to work correct. In example in other 3D 
>> app I just select geo and set it as rigidBody active or passive or 
>> just can apply gravity to geo and it follows down. Is this approach 
>> (just one click and make it rigid) wrong?
>>    Also rigidBodyConstraints are strange to me. What U people think 
>> about DOPs comparing it to another dynamics engines/solutions in 
>> other apps?
>> Have U more advanced Houdini users plan to use it in any movies?
>> r|m
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Sean Lewkiw
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