FMovieSceneInverseSequenceTransform

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API > API/Runtime > API/Runtime/MovieScene > API/Runtime/MovieScene/Evaluation

References

Syntax

USTRUCT ()  
struct FMovieSceneInverseSequenceTransform  
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USTRUCT () struct FMovieSceneInverseSequenceTransform

Remarks

The inverse of a FMovieSceneSequenceTransform representing a transformation from transformed, to untransformed space. This uses a different class and API because the algorithms for computing the inverse of non-linear are different, often more complex, and can fail. Whereas an FMovieSceneSequenceTransform can only represent a 1:1 mapping from outer to inner space, its inverse is a (sometimes empty) many:many mapping.

Consider a looping transform with a duration of 10 frames: [0, 10). Every time in the outer space maps to a time in the inner space, but the opposite is not true. Only frames 0-10 exist in the inner space, and each frame in that time maps to an infinite number of solutions in the outer space. Conversely, any inner time outside the loop range, ie, [-inf, 0)..(10, +inf] cannot be transformed into the outer space.

For this reason, the API only has functions for attempting such computations (TryTransformTime), and iterating the solutions for any given time within a range.

The inverse of an inverse transform is the original transform such that T*(1/T)=I theoretically holds true, although transform multiplication is not actually supported by the API.

Functions