• Adobe After Effects

  Eliminate Camera Shake Question

  Posted by Eric Goldstein on August 7, 2009 at 11:24 pm

  Hi,

  I’m compositing a greenscreen foreground on a CGI Background. The greenscreen footage has some fairly complex crane movement that was motion captured. The crane data was imported into 3D Max and the resulting background rendered out and composited with the greenscreen foreground. Camera movement from the actual crane shot and the 3D camera movent from the mo cap data fits together fairly well, except that the 30 foot crane has a certain flex to it that isn’t captured by the mo cap encoders and therefore isn’t present in the mo cap data. This means the foreground has a movment to it that the CGI doesn’t.

  I can track the CG foreground,and capture the crane flex movement, but I also get vertical and horizontal translation from the move itself. Does anyone have any thoughts or techniques to isolate the flexing movement of the crane from the move itself? I’d like to apply the flex movent to the background to sync the foreground and background. Is it possible to subtract the tracked movement of the shot from data from the mo cap? Any other thoughts?

  Please excuse the long post. Thanks,

  Eric

  Eric Goldstein replied 16 years, 9 months ago 29,680 Members · 4 Replies
• 4 Replies

• 

  Eric Goldstein

  August 9, 2009 at 4:58 am

  Hi Dave,

  I do have Syntheyes as well as PF Track. PF Track seems to be a superior tracker and I’m using it on some problem shots. But, because we shot greenscreen and mocap, there’s often an absence of trackable features. The shot I posted about doesn’t have sufficient foreground tracking possibilities to get an accurate track.

  So, I was wondering if there was some way I could use a 2D track of the foreground bounce and subtract the crane movement from it, then apply the result – being only the bounce to the background.

  What do you think?

  Thanks,

  Eric

  Eric Goldstein
  Giraffe Film Company
  Los Angeles
  eric@giraffefilm.com
• 

  Eric Goldstein

  August 10, 2009 at 9:28 pm

  Hi Dave,

  My expression capabilites are fairly rudimentary. I use them, but need a fair deal of guidence as things become more complex.

  Eric

  Eric Goldstein
  Giraffe Film Company
  Los Angeles
  eric@giraffefilm.com
• 

  Eric Goldstein

  August 11, 2009 at 7:25 pm

  Thanks, Dave. I’ll try posting in expressions.

  Eric

  Eric Goldstein
  Giraffe Film Company
  Los Angeles
  eric@giraffefilm.com
• 

  Eric Goldstein

  August 15, 2009 at 12:04 am

  Hi Dave,

  I just wanted to let you know that Filip over in expressions was able to help with an expression that worked really well.

  Thanks again,

  Eric

  Eric Goldstein
  Giraffe Film Company
  Los Angeles
  eric@giraffefilm.com

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