View Full Version : Interlacing of animated texture map on static 3d object question

10-11-2004, 06:08 PM
I have an animated texture map...on a stationary object. The texture
map was rendered with interlacing to keep it's video smooth because
it is shows something moving very quickly. When rendered on the
object...with the camera set to "odd" field interlacing...I get NO
interlacing in the finished animation.

It appears to me that the interlacing feature only works in
conjunction with the motion of the object and not the motion of the
animated texture on the object. Is there a setting I am missing that
handles interlacing for the textures too?

I have tried rendering the animated texture without
fields/interlacing..but it looks choppy once played in the video
editor (on the 3d object) because of the amount of movement in the
animated texture.

I have also tried turning on/off the interlacing feature under Image
Editor...for the animated texture - with it on...the rendered
texture looks choppy (no interlacing apparent)...with it turned off
(even though the texture has interlacing in it) it renders with
actual interlacing happening...but the interlacing is doing it based
of the original animated textures orientation (left to
right)...instead of it's new orientation which is turned 90 degrees
and mapped along a curved surface.

To break down what it is I am doing:
I have a curvy piece of 3d film (like from a roll of film for a
camera). I needed to make it seem like the film was spooling out
from it's film canister with images on it. So instead of moving the
3d piece of film with a long static texture of pics...I got the
bright idea to just do an animated texture on the surface of a
transparent 3d piece of film.

I rendered a section of the film sliding left to right in AE...(with
alpha on it's leading edge and in the sprocket holes) then texture
mapped that on the static transparent 3d film object...Worked
Perfect...looks like the film (with the texture appearing to slide
along the transparent surface) is spooling out out of the canister
as a curvy piece of film. Except for the fact that I can't get it to
show/use interlacing on the texture.

Any ideas/help. :confused:
Version 8.1 (on a PC)

Tony B.

10-12-2004, 12:34 AM
LW cannot interpolate image sequences, hence no Interlacing. It will only sample the current time and render whichever pixel value is there. You need to do such things in your video editing or compositing app. For Medium antialiasing you would need something like this to make it "perfect":

25 frames *2 (each field as a separate frame) * 9 (number of AA passes)

As you see, that already makes 450 images for a single second at PAL frame rate. IN AE this could be done by stting the frame rate properly and using frame blending (or plugins such as Twixtor for better quality) The easiest way to avoid this is really adding some motion to your scene.


10-12-2004, 10:45 AM
That makes perfect sense. I really should of "moved" my texture across the object...instead of faking it by making an animated texture look as if it was moving. If the texture was actually moving...it would of gotten the correct interlacing.

Thanks again, :)
Tony B.