symbolic offset name 符号区距名
Each Position has a length and offset, and a TypedPosition also has an associated name.
每一个Position都有一个长度及偏移量，而TypedPosition还有一个与之关联的名称。
The third parameter is the name of the output array, and the fourth is an offset into the output array.
第三个参数是输出数组的名字，第四个是输出数组中的偏移。
The timeshift shader has the parameter "Data Name" to determine from which user data the offset is taken.
时间偏移着色器具有参数“数据名称”，以确定从哪个用户数据获取偏移量。
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