Bug: False Loop Warning

Not really a bug, just an inconsistency.

The warning message about the loop not accepting bitmap components is present, but the loop still works (as it should).

It arises from the "position" slave component inputting into the rotation just before the motion blur.

Spin and Smudge.ffxml

Well this is what I see (Build release March 18). The blur and loop DOES render (you can see the warning icon next to the loop). I hope this functionality hasn't been lost.

I'll download the hotfix to see if anything changes...

Isn't it because the motion blur component is a bitmap component? I thought all bitmap components weren't usable??

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Isn't it because the motion blur component is a bitmap component? I thought all bitmap components weren't usable??

Yes, and yes.

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Vlad, I wanted the direction of motion blur to be a function of iteration (via the position component)

Alas, impossible, due to Motion Blur being a bitmap-based component.

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the filter DID RENDER, even though the motion blur was inside the loop! Look closely at my screenshot.

I'm sure it didn't render correctly. Perhaps Motion Blur was using the input / output cache it calculated for the first iteration, or something like that.

The correct behavior you'd expect is simply not possible because we don't recalculate bitmap caches for every Loop iteration. As long as there is a rendered cache block, Motion Blur will return it to the output without recalculating anything (and, consequently, without taking its inputs into account).

The assumption that the values on component's inputs don't change during the sampling process was true in old times, before the Loops era, but it isn't true now. So any component that caches its output into bitmap blocks and doesn't look at inputs again after a block has been rendered simply does not fit into the new scheme of things.

Thank you for explaining, I understand the gist of it. No wonder the filter rendered unusually fast...the motion blur only processed once! I'll try faking motion blur with a nested loop.