VMD-L Mailing List

From: lam nguyen (lamvn08_at_gmail.com)
Date: Mon Mar 05 2012 - 12:49:00 CST

Dear all,

I want to learn how to make movies with user-defined scripts. I started
with a simple script from the VMD tutorial. Here is the content:

proc moviecallback { args } {
  puts "User-defined movie frame update callback frame:
$::MovieMaker::userframe
 / $::MovieMaker::numframes"

  rotate y by 5
}

## Easy-to-use proc to enable the user-defined movie frame callback
proc enablemoviecallback { } {
  trace add variable ::MovieMaker::userframe write moviecallback
}

## Easy-to-use proc to disable the user-defined movie frame callback
proc disablemoviecallback { } {
  trace remove variable ::MovieMaker::userframe write moviecallback
}

In the Tk console:
source usermovie.tcl
enablemoviecallback

Then in the movie maker window I chose User defined procedure.

However I got an error message: Invalid input file expansion expression (no
']')

Can anyone please tell me what I did wrong here?

Thanks

Lam