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Render problems – collapsed transformations on 3D layers and precomps
I’m having some weird issues with rendering out a fairly simple motion graphic… In the render various layers do weird things for one frame here and there that they are not supposed to, and don’t do in a RAM preview OR a file>export – eg. disappear, duck ‘below’ a layer they are on top of, change opacity (or could be transfer mode), act like a matte for another layer and so on. Sometimes for a frame or two and sometimes for half a second. Only when I render – they behave normally when I preview and export. This suggests to me its something in the render engine – but what?
Basically there’s about 15 illustrator layers in a comp, each using another (parented layer) as a luma matte to add texture, These graphic elements are static but have animated masks which reveal them. Mostly they have no effects. They are 3D but all at z depth 0.0 . This is a big 1600 x 1000 px comp which is then precomposed and collapsed transformed into another 720 x 576 comp where a camera zooms out and rotates over them all. It was rendering fine until I collapsed the transformations and then had to make all the graphic layers 3D
Any ideas?
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5 Replies
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I’ve just noticed that the disappearing layers are something to do with motion blur… My exported video has no motion blur anywhere – presumably its disabled when using file>export command. However, when I make motion blur visible in the project I can see the problems during previewing now… so its not a render issue specifically but somethign to do with motion blur – when is motion blur rendered in the masks – transform – effects order?
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I think your problem is in the z depth. I know you said that the layers are all at zero and thus you would think that stacking order would determine which is on top but if you have changed x or y or even scaled a layer you can have intersection problems. You might check the comps 3d render settings (it’s in the advanced tab).
I’m not understanding why you made the layers 3D, if you can go without – the problem should go away.
TonyTony
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I had to make them 3D when I collapsed transformations in the upper comp, otherwise the camera move in that comp had no effect on them and they looked 2D. I’ll try giving them all a tiny amount of z depth and see how i get on, but I need to keep their size in the frame the same so I can’t go moving them back or forward too much.
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I’ve given all the layers in all sub comps a little z depth (ranging from 0.000 to 0.0050 or so ) and it has helped somewhat – now the problems only occur where there are really a lot of layers on at once.. still able to eradicate probs by disbling motion blur but I want that on… Must be just a render pipeline nightmare.
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Well, I seem to have more or less solved my own problem, but somebody might find it useful to know how in the future… I enabled ALL the individual layers motion blur switches in ALL comps and sub comps. Coupled with the separation in z space I gave them last night, the problems have gone away. For anyone who’s interested I didnt have the motion blur checked on for the layers that were track mattes before as I wanted them as crisp as possible, but it seems that I needed to have them on as well. Thanks for listening.
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