Time varying attributes

[dedoardo]

Time varying attributes - transforms, positions, normals or others we will need in the future - are sampled inconsistently and I think they should go behind the same interface similarly to HdCyclesSetTransform .

• You make no assumptions about the samples/times are received
• You approximate the input using a (configurable) number of samples which linearly interpolates them and formats them as Cycles like.

IMHO, this is something that should go inside Cycles and exposed through something like set_timevarying_attributes(times, samples).

I would say this has less priority than making the Sync process more parallel.