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Activity Forums Commotion 10 yard line

  • 10 yard line

    Posted by Doug Moody on February 11, 2006 at 12:59 am

    I have been trying to simulate in post the yellow 10 yard line you see superimposed in football games. A simple project I have had is a marching band going down a parade route and the camera pans them.

    I tried making a rotospline which made a black line across the road, and then applied a tracker to it so it would stay in place while the band marched over it, similar to what you would see in a football game 10 yard line.

    It worked, kind of. But the uniforms of the marching band cut through the line, making it apparent that it was not part of the road.

    Am I going about this the right way? Maybe I need to paint the line by hand so it tracks the road. But I am still unclear if I can even do this. I was wondering too if I can select certain colors to not apply themselves when they cross the plane of the line so the line will allow shadows and such to fall on it, making it appear as though it is actually on the ground.


    Doug Moody replied 18 years, 2 months ago 2 Members · 2 Replies
  • 2 Replies
  • Matt Silverman

    February 11, 2006 at 1:13 am

    You now need to duplicate your background, put it on the top, then rotoscope or key the people back on top of the line.

  • Doug Moody

    February 11, 2006 at 5:03 pm


    Oo. That sounds like more trouble than it’s worth. I read an article about how they do this live on TV and it takes about a trailers load worth of comptuers, pan heads that keep track of the camera’s position at all times, a line that compensates for the curvature of the football field, and special color palettes that key out all colors except the line.

    I was just hoping for something that would be simple in post. Apparently no luck. I can see your appriach in my mind’s eye, but the idea of roto or keying out the people (and tracking hteir movement) seems like too much. I wanted to do a “highlights of the game” kind of video for some high school football for the players to review. But doing it this way in Commotion would be something I would reserve only for a feature film.

    Nevertheless, you are ALWAYS the guy who is willing to help. I know you love Commotion, and your support over the years is much valued. I hope to meet you someday. Thanks, and if you have any other ideas about this, don’t hesitate to write.

    An Avid Liquid Edition 7 user who enjoys special effects, but especially likes to do work in Commotion.

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