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Thank you! The only problem I've notice is that the centroid is the same for every new sphere emitted, so it gives a direction more than an impulse from it's center. I've achieved I think in some way, but I'm not sure is the best way to do it, as I'm farily new in houdini. What I did was with a sopSolver inside rbdBulletSolver connected to the presolve output dopImport->attRandomize @v min(-1,-1,-1) max(1,1,1) ->attWrangle: int was_active = point(1, "active", @ptnum); int now_active = i@active; if (now_active == 1 && was_active == 0) { v@v *= chf("impulse_strength"); } Now my problem is to create smoke from the debris, as DebrisSource is not reading the incoming geometry as they are not in the scene from the beginning, so the rest frame is not working. Any suggestion is welcome   

Hi, insert an attribute wrangle into connection wire of the rbd bullet solver sop first input, copy and past this code: vector centroid = getbbox_center(0); vector vel = normalize(@P - centroid) * ch("scale"); v@v = vel; It should work in your scene without other changes.

untitled.mp4  something like that ?   just create veloctiy from the center and control the intensity by age ramp  

happy that i could help        

This is not the same effect but thank you.