How to achieve a directional crumble effect.....

Does anyone know how to achieve this effect where a building crumbles and collapses into itself?? (30 seconds in)…

I have been using the fracture add on which is great. But not sure how to achieve a gradual crumbling from the top to the bottom like in the vid. All I can get is all the shards falling at the same time.



Moved to Support / Particles & Simulations forum.