Random start or activation of sim objects

[art3mis]

Using this excellent example as a starting point to staggger the start of simulation objects in a bullet solver

http://www.tokeru.com/cgwiki/index.php?title=HoudiniDops#RBD_inherit_.40v_and_.40w_after_initial_frame

 

But how would I modify this example so that the start is random instead of staggered?

 

This gif illustrates my original problem. Notice the tiles under the sphere clump and fall together.

 

 

Edited July 19, 2017 by art3mis

[Noobini]

what about this timed release by mestela ?

http://www.tokeru.com/cgwiki/index.php?title=HoudiniDops#RBD_packed_prims_and_deforming_geo

[art3mis]

Thanks. But I need a random, not any type of staggered effect.

Did a bunch of searching and think I'm closer. This thread in particular http://forums.odforce.net/topic/16867-per-fracture-object-density/

The key find for me in this thread I think is use of the Active Value DOP with default operation = Set Always. I then simply need a proper expression in the Active field, I'm guessing using $OBJID, that will evaluate to 1 at a random frame between say 1 and 100 using the OBJID as a seed for the random frame interval.

Thoughts?

[Sean-R]

If you're working with packed objects you can set an active attribute on each objects in the SOP level.

I wrote this expression in a Point Wrangle to randomise the activation:

int randomF = ceil(fit01(rand(@ptnum), 1,30));
if(@Frame>=randomF){
    i@active = 1;
    }
    ;

Then under the rbdpackedobject1 node in the dopnet I checked "Overwrite attributes from SOPs"

randomActivation.hipnc