帮助文件对过滤点数是如此描述的:
Using the look ahead parameter
The look ahead parameter specifies how many points Mastercam will consider at a time when attempting to simplify a toolpath. You should consider the toolpath geometry when trying to figure the optimal look ahead value. For example, if the original toolpath has a linear motion that contains 100 different blocks and the look ahead is set to 10, Mastercam will create at least 10 different blocks for the filtered toolpath. If the look ahead is set to 50, it will create only two blocks. A too small number hampers simplification by limiting the number of moves that can be replaced at any one time. A large number will result in a simpler toolpath but may also slightly increase processing time. The same approach is used when filtering arc moves. The larger the look ahead, the more time Filtering will take.