Using shademap for rendering every second image efficiently

[Robert1977]

Dear all,

I made some tests to "misuse" the technique of the shademap for stereoscopic images. My goal was to render only 25 fps and to render every second images with the use of a shademap to achieve 50fps monoscopic footage without too much rendertime. 50fps is needed by a special screen technique we produce for.

And it worked!

All I did is to set the eye distance of the stereoscopic helper to 0.0, to apply no focus and to rename the shademaps to the desired frames to be rendered afterwards.

Now I have two questions.

1. Has anybody had experience with this as well?
2. How can I avoid that the image rendered from the shademap is always blurrier than an image rendered in the standard way? Should I render the shademap without antialiasing and then later on apply antialiasing only to the final image?

Thanks

Robert

[Robert1977]

Got it. Create the shademap without antialiasing in the rendersettings. When creating the final image from the shademap, render also without antialiasing or with just a small value. Seems that the shademap will be blurred anyway a bit.

[vlado]

Hmpf that's some creative use of the shademap... I never thought it could be used for that

The shademap is always a little blurrier unfortunately; as you have found out, turning off antialiasing may help to reduce that a bit.

Best regards,
Vldao

[Robert1977]

Yeah, I tried this because the optical flow pixel motion retiming methods in Fusion or Aftereffects with Kronos, Twixtor or Dimension didn't work perfectly - it came always with artefacts here and there. Even when I used the velocity channel, it didn't work. Velocity increased problems on the edges of objects that have different speeds. Or I just don't know how to do it properly(?).
The shademap method seems to produce the best results, no artifacts. Problems might occur when you cannot simply rename the frames of the shademaps, if your retiming is not from 25 to 50, but from 25 to 30 or 24 frames. Maybe this could be a feature to be used in the future?

Cheers

Robert