默认的碰撞检测在帧结束的时候计算特定联系点。
By default, the collision detector calculates contact characteristics at the end of the current frame.
提出了一种有效的帧同步和帧通信策略,在每帧结束时集中进行同步和通信。
Synchronization and communication are put together at the end of each frame.
每个消息(即帧)以一个命令开头,以一个表示null字符的ASCII符号结束。
Each message, or frame, starts with a command and ends with the ASCII sign for a null character.
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