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Field Sequential Stereoscopy compositing for goggles
Hello All,
I was just wondering if anyone has any experience with making field sequential video composites for stereoscopic goggles. In my case, I am producing from Maya.
From what I understand, the process should go like this: Create animation (or video) with 2 cameras, each representing an eye. Render each sequence. Bring them both into AE. Composite so that the resulting video has one eye’s sequence on the even fields and another on the odd fields. Then you just play the video through the goggles and there you have it.
It is the final integration of fields that has me stumped. Is there a way in AE to combine 2 sequences into one video using fields?
Also, as I have said, this is how I understand the process to work, that is not to say that this is right. I would love to hear from someone who has experience in this, or even anyone how just has a theory. All suggestions are appreciated.Thanks!
Tim -
3 Replies
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My theory (ahem):
You could do this with two 29.97 progressive animations (left/right). Bring them both into a comp. Add a solid on top which consists of alternating black and white lines. Use that solid as a luma matte for one of the layers. Render with no fields — rendering as fields is only necessary when you’ve animated motion in AE. In this case, you haven’t – you’re just compositing images.Regarding field order, that is, whether left gets upper or lower, I don’t know. I recommend testing with the system, with “left eye upper” text or whatever on the video.
The black/white line solid could be made a few ways .. maybe 2 pixels high, full width, one black line, one white, then apply motion tile to repeat the lines. Or maybe use the venetian blinds transition, then use that solid as an alpha matte.
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thanks for the suggestions. I will certainly try this but I think there is an easier way to do it… maybe.
thanks again
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My error:
I couldn’t make “venetian blinds” work.
But if you made a matte layer, you’d have to dupe it, use luma mate for one footage layer, then use inverse luma matte for the other footage layer.
You could use the grid effect on the matte, with a border of 2, height of 2, and length of 720, with the anchor at 0,0. To get those values, you’d probably have to R-click on the values and use “edit value”.
But however you make the matte, you could always save it as a still and use it again.
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