At this time, I experiment collision for accident situation. The original two objects are normal cube and the collision is breaking accidentally by vornoi rule. The accident will be outside solid and the result fragments will be inner side void. The two objects are same size and have same velocity in this situation. This is the collision between same things.
Breaking in voronoi
The selected frame shapes are converted to maya with obj file form. These will making final form with solid and void. But the original part have breaking fragment originally, It needs making one shape in model. Otherwise, it may make the error in extracting surface step. So I am working on trimming in original parts.
Two selected frame shapes
Making form
Trimming inner surface