| contacts | 用于获取这些结果的 ContactPoint2D 数组。 |
int
返回放置在 contacts 数组中的接触数。
获取在 collider 与 otherCollider 之间接触的所有接触点。
When retrieving contacts, you should ensure that the provided array is large enough to contain all the contacts you are interested in. Typically the array would be reused therefore it would be a size to return a reasonable quantity of contacts. This function also means that no allocations occur which means no work is produced for the garbage collector.
You can check how many contacts are available using contactCount.
See Also: Physics2D.GetContacts, Collider2D.GetContacts and Rigidbody2D.GetContacts.