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Description
We currently have no reliable way to detect when there's animated attributes or animated transforms without bounds (no objects) at any location in the hierarchy of a SceneCache.
Our readers in Houdini and Maya rely on the boundSamples() as a hint for that, and set their outputs as dirty only when there are animated bounding boxes. This of course fails on the two situations described above...
If SceneCache writes sceneInterface:animatedTransform and sceneInterface:animatedAttribute tags we could distinguish these cases. But this means creating two new tags on the whole hierarchy when there's animation and we should check the file size and memory consumption before doing it.