Video: 0076_assemble_puzzle_2
Phase transition: merge
State before: solid:non_particulate:rigid body
State after: solid:non_particulate:rigid body
Object: In the process of assembling the puzzle, the black puzzle piece which is not being held in the initial frame
目标物体: 在拼图过程中，位于初始帧中没有握住的黑色拼图块