In the case of a script ran in an external Python interpreter, the shell from which the Composite Python script is invoked must have the following environment variables set (except on Mac OS which doesn't require any). In the following paths,<INSTALL_DIR>refers to the path of the Composite installation directory:

On all operating systems, except Mac OS:

1. DL_INSTALL_DIR=<INSTALL_DIR>

On Windows

1. PYTHONHOME = <INSTALL_DIR>/python
2. PATH = <INSTALL_DIR>/program;<INSTALL_DIR/plugins

On Linux

1. PYTHONHOME = <INSTALL_DIR>
2. LD_LIBRARY_PATH = <INSTALL_DIR>lib:<INSTALL_DIR>/plugins:<INSTALL_DIR>/lib/python2.5/site-packages/autodesk_toxik/libs