Jump to: Board index » General » Fusion

How to adjust strength of perspective after tracking

Learn about 3D compositing, animation, broadcast design and VFX workflows.
  • Author
  • Message
Offline

Fotoshootprod

  • Posts: 3
  • Joined: Fri Apr 02, 2021 6:39 pm
  • Real Name: Jean Jacques Fabien

How to adjust strength of perspective after tracking

PostMon Jul 26, 2021 7:02 am

Hello all good people.

I have shot a few clips in a green screen room and changed the green screen background with a static image in fusion. I have tracked the main subject (a lady dancing and I moved the camera in front of her in parallax). I applied the tracking to the background. Both (background and foreground ) are now moving accordingly but the background which is a far away mountain is moving « too much » as if it was just a few meters behind the subject. I wanted to know if there was a way to decrease the strength of the tracking to the background in order to adjust the perspective movement. Just to explain my idea, if I film someone and do a parallax move in front if the subject and there is a mountain far away, the movement of the background will be much less than if there is a very close background like a house or a tree for instance. I want to be able to replicate the low parallax with the far away background image. Hope it’s clear.

Thank you in advance.
Offline

birdseye

  • Posts: 98
  • Joined: Fri Jun 12, 2020 2:36 pm
  • Real Name: Iain Fisher

Re: How to adjust strength of perspective after tracking

PostTue Jul 27, 2021 8:15 am

I was just stumbled across a way to scale tracking data (apart from a way Bryan Ray showed me a load of months ago). The size control in the tracker node track modifiers, appears to scale the tracking data as far as I can see from a simple test. You will have to suss it out for yourself or maybe someone more knowledgable will explain. As I say I just realised what it was doing yesterday, so I haven't had a chance to try it on more than a single track or ask a semi sensible question about it.

Search for a thread headed 'Scale Tracker movement' for the solution Bryan posted.

Another method I had been using was simply to use a transform node to scale the image appropriately, track the rescaled image and then apply that tracking data to the original sized image.

Return to Fusion

Who is online

Users browsing this forum: No registered users and 10 guests