An annular groove is at the outer surface of the insulated loopframe, which requires a vertical parting of the mould along the axis.
线圈绝缘框外侧有一圈凹槽，要求成型模具沿轴线垂直分型。
2
The next loop section controls setting pixels coordinates only if the frame at that position is greater than the start frame.
循环的下一部分控制像素坐标的设置，条件是当前时间帧在起始帧之后。
3
Then, each pass of the main loop checks for events, resets the draw state, draws the circular "portal" windows, then animates their distortion back to the current time frame.