An animation curve is comprised of multiple segments.
The curve information is stored in multiple key frames in these segments.
Three types of data formats have been prepared for the animation segment information, and the method of key frame interpolation is different for each.
| Name | Image | Description |
| Step format |  |
In these kinds of segments, values change discontinuously. |
|---|---|---|
| Linear format |  |
In these kinds of segments, values change linearly. Values between keys are calculated using linear interpolation. |
| Hermite format |  |
In these kinds of segments, values change smoothly. Values between keys are calculated using Hermite interpolation. |
In frame-format animation, key frames are not utilized, and instead the evaluation result for the entire frame of animation is stored.
This format is used for the purpose of lightening the animation computation process.
In NW4C, this process is conducted during binarization, and the only thing described in the intermediate file is the flag that enables the making of frames (the IsFrameFormat attribute of <BinarizeOption>
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