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Juddery 3D animation in AFX
Hi
I’m bringing in some 3D animations of trucks driving across the screen – left to right and right to left – against a plain gray BG. They’ve been properly produced in Lightwave by my usual supplier and have motion blurring. When I render these they look really steppy/juddery despite trying lots of different combinations of settings.
The only thing that helps is speeding them up (at the Lightwave stage not in AFX) so that they cross the frame in around 40 frames. At this speed it’s less noticeable but still there.
At around 75 frames to cross the screen (1024 pixels wide) they look crap. Both I and my 3D guy are mystified – maybe it’s the plainess of the BG?
We’ve done lots of 3D animations that look smooth as silk?
Any ideas – or a way to smooth them out?
They’re being shown as WMVs as well as DVD video – I’ve yet to see if an interlaced version on DVD looks better so it might just be a progressive thing?
Thanks
Andy
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4 Replies
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when i work in 3d and composite in ae, i prefer to render the 3d at 60p… the progressive allows me a greater ability to manipulate the 3d footage in ae and 60 fps allows me to render interlace if needed.
there is a plugin called reel smart motion blur by re:vision that does a good job of creating motion blur on footage that needs more motion blur. it may help too.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW -
Did he field render the Lightwave scene. Try reinterpreting the the fields on the clip. I’ve had weird experiences with fielded stuff out of Lightwave where the fields flipped dominance in the middle of a clip. That aside, the motion blur in Lightwave looks like crap. See if your guy can render without motion blur and fake it in AE ideally with Reelsmart Motion Blur. If not use the standard directional blur or CCVector blur. If that doesn’t look good enough have your 3D guy up the number of motion blur passes in his render and render without fields. That’ll really drive up his render times tho.
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the movement might also be at a critical panning speed. anyone that’s shot 24p or film for that matter knows that there are certain speeds where motion just stutters. it’s called stroboscopic effect and the only way around it is to change the speed of the move or increase the blur.
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Thanks All
The 3D was rendered as frames not fielded. We tried different amounts of motion blur but that really made no difference. We have speeded up the movement of the graphics in Lightwave and it looks better but still mot as smooth as I’d like.
I’ll take a look at the other things you mentioned.
Andy
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