Create a layer of corroded material and a layer of concrete material. Place the corroded material outside the concrete and then cause the outer layer to corrode until it is gone. Timestamp 00:00​ ...

Turn object into pieces and then combine them into other object. Using Quick Explode Modifier. This is a Quick Blender tip Timestamp 00:00​ Introduction 00:14 Create Objects 01:01 Quick Explode 01:50 ...