Spencer Tweed
Forum Replies Created
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Dear All,
I figured it out! I thought I’d post this, because it is purely genius! (I can’t take all of the credit, a gaffer gave me the idea.)
All I did was stick 3 plates of glass on the top of the table side-by-side (repurposed from some picture frames in the studio), that way the actors can do whatever they want and the glass will pick it up in the reflections. Then when I key it, I’ll roto the glass out and key it separately as a reflection and composite this back onto the CG table-top!
– Spencer
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Thanks Steve, but this only works on layers that are totally flat. For example if the actor leans forward on the table and you are shooting a medium shot from directly in front of him, there is a bit of perspective between his hands and his elbows. If I roto these out and then apply AK’s plug-in to it, it will look as if only his hands touch the table and his arms are floating or something.
Thanks for the suggestion though, maybe there is a way to build on this idea. I was thinking that if I did some sort of 3D distort on the arm I could then rotate it down in 3D and get a reflection. But that would involve camera-mapping the footage onto a 3D card that is placed at about the same position as his arm, then applying the plug-in to it and placing it back into the comp – something that would be too complicated for the time involved.
– Spencer
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use the matte layer with inverted alpha to remove artifacting and isolate multiple passes. plus use vectors 100%, smoothing 28. filter extreme. you can try RSMB as a trial and see if you like it better. nothings perfect, after all:)
I applied Unmult to my matte layer and just put MotionBlur after it; this definitely served to clean up the blur a little bit but it still isn’t perfect. It is much better though!
Well all of this has certainly served to muddle my decision further… I think that the deciding factor is that Twixtor is around $600 and RSMB is $80, while Kronos is $100 and includes both.
Our editor would seriously appreciate Kronos over Avid’s Timewarp, so I should probably get it anyway…
Thanks everyone!
– Spencer -
I see… I tested it out and though this worked better, it had a little bit of artifacting. And you are right, it is a little funky (plus, what happens if you want to blur everything, and not just one object?).
Does anyone know if RSMB will give you perfect results if you export motion vectors?
– Spencer
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So you are saying it will just have half of the data to interpolate with?
– Spencer
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What you are saying is that if you collapse transformations on a pre-comped layer that has time remapping it will basically adjust keyframes instead of interpolating new images? I’ve wondered about this but haven’t had a chance to test it.
– Spencer
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Hey Dave,
Sorry to throw this back at you, but what does any of that matter? Interlaced or progressive doesn’t make a difference as long as he is interpolating it correctly because After Effects just builds whole frames out of the fields anyway. Frame rate shouldn’t change anything unless he is working with something crazy (as far as I know, anyway. Correct me if I’m wrong). Other than that the only thing I can think of that would throw off the pixel blending is a 3:2 pulldown, which I haven’t tried before but I would hope that After Effects could handle this in a similar way that it deals with fields.
Progressive segmented frames don’t apply because the only time you would see this in After Effects is during rendering; in other words after the time remap has been calculated.
All that said, you are right – it would be easier if we knew the exact situation and footage involved.
– Spencer
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Hey Chris,
kronos can add motion blur to a layer based on the movement in another layer.
This sounds like regular old optical flow data, how does it differ? Also, what kind of pass is this? I have 3DS Max and want to check it out.
Wow reverse motion blur? That sounds kind of cool! I don’t know if you know 3DS Max, but I currently render my motion blur with the ‘HDR Motion Blur’ camera shader and sometimes it wiggs out and renders some overly blurred pixels…
– Spencer
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Thanks Walter,
I have a quatro 4800, which renders Kronos almost realtime (a hell of a lot faster than the Timewarp plug-in).
RE:Vision Effect’s Reel Smart Motion Blur Pro (not the standard version) allows you to use a motion vector pass from your 3D app to drive the motion blur.
How does this compare to not having motion vectors; in other words what kind of improvement do you see when using motion vectors? I have 3DS Max 2011. Also, doesn’t Kronos support something like this?
Thanks,
– Spencer
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It is quite simple. To elaborate on what the Adobe guy said, you take all of those and stick them in comp A. Then put comp A into comp B (precompose it, in other words). Inside comp B you animate the time-remap values.
Andrew Kramer (videocopilot.net) has a few tutorials on this. Check them out, you can always learn a few things from him.
– Spencer