第四价值，透明度，像素控制都是奠定在像素之上。
A fourth value, opacity, controls how pixels blend with pixels laid over them.
最近，LOD技术也被阴影管理系统中的复杂像素控制。
Recently, LOD techniques included also shader management to keep control of pixel complexity.
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。
The next loop section controls setting pixels coordinates only if the frame at that position is greater than the start frame.
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