Field Compositing With Cgi Elements

[user_deleted]

I have some backplates PAL res, that are interlaced.
I understand how to deal with this footage.
File in footage.
Set de-interlacing to fields at in the File In Source TAB, in this case ODD(pal).
Then set the increment in the timeline to 0.5
Then set the Field rendering option in the Globals,(render Controls) Tab to Odd.
Thats all Fine.

O.K Now i have to add CGI elements rendered with camera moves over them.

If im running therefore at 25fps, does the cgi stuff Have to come in at 25fps and equal the length of the Clip,
If so how do i handle it?
Should i give it fields or not?

Or should i have the CGI elements come in at 50fps twice the length, and the treat this by Which method.?
Add Fields, or put on two's. or what.

And Finally how should i mix the two, considering im working on a 0.5 frame increment in the timeline.

If anyone has any advice , i would be grateful to hear from you.

Remembering, eventually the final renders will be put onto Digi-beta, and therefore have to maintain a Field Rendering aspect. And that my timeline is set to 0.5.

A

[user_deleted]

Take a look in the re-timing tab of the file in node. you can convert your footage from interlaced to non-interlaced without having to set your timeline to increments of .5. this should allow you to use that non interlaced cg footage.

However, as you're going back to digi you might want to reverse what i just told you and set the cg footage to interlaced (if it hasn't been rendered yet)...the only catch is if there is lots of horizontal movement in your cg and it is rendered as progressive frames you'll get strobing and tearing.

Some CG packages allow you to render in full progressive frames in .5 increments, but it will probably be easier to just render with fields. you'll get basically the exact same lengh as your current pal footage.

[user_deleted]

From all the projects that I've done I have yet to do one that having interlaced footage looked better then just converting it to "progressive". The fact that you are going to Digibeta does not mean the footage HAS to be interlaced. It will be converted on output, although its not true interlacing, but for the most part, you would not notice the difference, and for the parts that you would, it actually gives it the "film" look which is nice.
If this wasn't enough, there are so MANY reasons why you should not work in interlace land (keying, CC, roto....), but the best is the fact that you are rendering CG elements. if you do .5 increments you also have double the render time and double the work in comp for anything you have to animate and keyframe.
Do a few seconds test and see how it looks and what works for your specific project. It is so random to just decide in general. It depends so much on how the footage was shot and so on...
A.