if (collision.contacts[0].normal.y == -1) {
Debug.Log("++++++++++++++从上方碰撞");
} else if (collision.contacts[0].normal.y == 1) {
Debug.Log("++++++++++++++从下方碰撞");
}
else if (collision.contacts[0].normal.x == -1)
{
Debug.Log("++++++++++++++从左边碰撞");
}
else if (collision.contacts[0].normal.x == 1)
{
Debug.Log("++++++++++++++从右边碰撞");
}
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