| shapeIdx | 要检索的物理形状的索引。 |
| physicsShape | 所选物理形状中点的有序列表，用于存储这些点。 |
int 存储在给定列表中的点数。
按索引从精灵获取物理形状。
物理形状 是在定义精灵（用于物理效果）轮廓的各点之间的线段的循环序列。精灵可能有孔和不连续部分，因此其轮廓不一定由单个物理形状定义。
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