#Field rendering question
4 messages in this thread
Jonas,
I am experimenting with rendering on fields (to disk, then to tape). But there
are some things I don't understand. Perhaps you can clarify them.
When I render a field to the display (and disk), I first see a field being
displayed during the "transforming" process. Then it renders another field over
the original image. Thus the image, like the file, has 2 fields instead of one.
I thought that I would be rendering a field instead of 2. Could you explain
what is going on? Incidently, I am doing this to circumvent the problems
indiginous to MPEG where only the fields are compressed; I want to Y-blur the
fields before I put them to tape.
Thanks.
– Gregory
When 3DS renders to fields, it first writes field 0 to the frame, leaving field
1 scanlines blank. It then goes back and writes field 1 to the frame on those
blank scanlines.
– G
Gary,
Sure, but that's not what I want. I want the fields, not sequential TGA files
consisting of two fields in a file. What I want to do is save the individual
fields, filter them in the Y direction, and then combine them in one TGA file
(and then convert them to exebyte format, then MPEG the images at PVR). The
problem that I am trying to solve is MPEG's using only the fields when it
converts and compresses the images. I'd like to get the highest image quality
in MPEG, which, if done normally, looks awful. I've tried a lot of tricks but
encountered Moire patterns or worse. Other alternatives will be gleefully
appreciated.
– Gregory
There are a couple of very straightforward ways to get just individual fields
out of the system. The way I'd do it is to Rescale time 2x to double the
number of frames, and then halve the vertical resolution (to 243 for a
486-pixel frame). Another way would be to render in fields at full res with
normal time-scale, and then use a matte in video post to strip out one field or
the other.
A third way would be to use an IPAS routine. I think that Greg Pyros and Gus
might've come up with something that'll do that. You could check with them
about it.
– G