[some follow up ideas]
Hello,
Carsten Neumann wrote:
> where I don't have a good solution yet (but really need one, so ideas
> very welcome), is the blending of multiple animations; I see two
> difficulties this introduces:
> 1) the output of multiple interpolators has to be temporarily stored
> somewhere and there needs to be a trigger to perform the actual blending
> and storing of the final value. Alternatively something has to know that
> it is the first thing to write to a field in this frame and sets an
> absolute value, while all subsequent writes in this frame make relative
> changes. The latter sounds fairly brittle to me though.
> 2) since the blend weights change over time (e.g. to fade one anim out,
> fade another in) the natural choice seems to control the weights with an
> animation of their own, but then there is an ordering dependency between
> animations.
ok, so here is one idea how to solve this in a fairly general fashion:
When adding a field connection we add attachments to source and
destination (SrcConnAtt/DstConnAtt). DstConnAtt stores the sources and a
sequence number, which is computed as max(sequence number of sources) +
1 and a source without a DstConnAtt has sequence number 0.
When a field is changed, the SrcConnAtt (registered as a changed
callback) notifies the DstConnAtt that updated data is available and the
DstConnAtt puts itself in a priority queue on the FrameHandler. After
firing all FrameTasks the FrameHandler goes into a loop until the
priority queue is empty. In each round of the loop it triggers the
DstConnAtt with the lowest sequence number which means that it will only
modify the destination field if all inputs for this frame are available.
Random other things:
- DstConnAtt with a single source can write data immediately
- we can keep the current type of connection and call the new ones
ManagedConnection ?
- managed vs. unmanaged connection can not be freely mixed, as I don't
see a way to preserve the sequence numbers without a destination
attachment (the current connections can target a plain FieldContainer,
managed connections require an AttachmentContainer as target).
comments/ideas ?
Thanks,
Carsten
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