Hasta La Motion!

Hey guys, long time Shake user now at a studio with Fusion and trying to get my head around it. I figure I have bothered the guys over at pigsfly enough for one week, so here I am!

I am trying to nut out some 3D tracking issues. We are doing a few sky replacements on some aeriel landscape shots. I have run the footage through Syntheyes and output a Fusion5 comp, so no issues there.

However, I am wanting to use a couple of the null markers on the horizon to help with roto. I have tried the 3D roto kludge on the VFXpedia website and it seems to crach my Fusion (5.21) so we resorted to more basic methods.

Am I correct in saying that the Locator3D node can take 3D co-ords and make them available to 2D nodes in Fusion? And, more specifically, will it give *animated* results?

That is, there is ZERO point in having the co-ords of a tracking marker or Locator3D if it doesn’t "move". Obviously, the null markers don’t move; they are the "ground". The camera is the thing that moves. What I need is really the data of the Locator3D *after* looking through the camera, if that makes sense.

To get the position data at the moment I am resorting to attaching a 3D object to the null markers and then tracking those after the 3Drender node! Obviously this is not ideal and I get the feeling that I am wasting perfectly fine tracking data.

I’ll be honest here, tracking in Fusion has been chaffing my ass for the last week and it would be great if I can get some insight before the weekend so I will not blow a gasket!

Cheers

Matt