Quit Maya if it is running.Copy the script to your local sourceable script path for yourself.
Typically something like: C:\Documents and Settings\YOURNAME\My Documents\maya\scripts\ will work just fine.
Select vertex or locator AND camera (script create curve in camera space, so u must select 2 objects) and execute MEL command TrailCurveCam();Also you can pull command to shelf line via MMB to create shelf Button.
You can select part of timeline for creating trail only for several frames.
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Please use the Feature Requests to give me ideas.
Please use the Support Forum if you have any questions or problems.
Please rate and review in the Review section.