[Sidefx-houdini-list] Sticking rigid bodies to animated geometry

Andy Nicholas andy at andynicholas.com
Mon Oct 29 08:55:57 EDT 2007


Cool, thanks for the tips. I'll give it a go :-)


> You can use the Point Position Dop exactly like the Copy Sop. Give your
> template points a normal and up vector. Very fast. Try using an
> expression like point("/o/geo1/someSop",opdigits($OBJNAME),"Cd",0)<.5 in
> the Activation field to animate the constraint where the Cd attribute is
> animated. Note you will have to explicitly set vel and angvel in an RBD
> State Dop because there is currently no Calculate Velocity Dop (which is
> a pity). You should also animate the active value. Do watch out for the
> set Always option as Ben points out..
>
> Ben Schrijvers wrote:
>> Hi Andy,
>>
>> You first need to get that object into DOP's.
>> As you only need it's transform you could create an Empty Dop object and
>> connect a position Dop or something to set (override) the transform.
>> Just use ch("/obj/my_anim_obj/tx") kind of expressions and set the
>> parameters to "Always".
>>
>> cheers,
>> benS
>>
>>
>> Andy Nicholas wrote:
>>
>>> Hi,
>>>
>>> I'm having a few difficulties getting a rigid body glue object to glue
>>> to
>>> an animated object in Houdini 8. Is this possible? Everything I try
>>> just
>>> leaves the rigid body objects behind. Any pointers would be great :-)
>>>
>>> Thanks
>>>
>>> Andy
>>>
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>>
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