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#### Subsets of Animation Frames

`Subset_Start_Frame=`n | Set subset starting frame to n
`Subset_Start_Frame=`0.n | Set subset starting frame to n percent
`Subset_End_Frame=`n | Set subset ending frame to n
`Subset_End_Frame=`0.n | Set subset ending frame to n percent
`+SF` n or `+SF` 0.n | Same as `Subset_Start_Frame`
`+EF` n or `+EF` 0.n | Same as `Subset_End_Frame`

When creating a long animation, it may be handy to render only a portion of the animation to see what it looks like. Suppose you have 100 frames but only want to render frames 30 through 40. If you set `Initial_Frame=30` and `Final_Frame=40` then the clock would vary from 0.0 to 1.0 from frames 30 through 40 rather than 0.30 through 0.40 as it should. Therefore you should leave `Initial_Frame=1` and `Final_Frame=100` and use `Subset_Start_Frame=30` and `Subset_End_Frame=40` to selectively render part of the scene. POV-Ray will then properly compute the clock values.

Usually you will specify the subset using the actual integer frame numbers however an alternate form of the subset commands takes a float value in the range 0.0 <=n.nnn <=1.0 which is interpreted as a fraction of the whole animation. For example, `Subset_Start_Frame=0.333` and `Subset_End_Frame=0.667` would render the middle 1/3rd of a sequence regardless of the number of frames.

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