Trad is based on the Tcl/Tk wish(1) "windowing shell" written by John Ousterhout. (See below for instructions on installing this package if you do not have it already.)
The trad interface divides the rendering problem into seven screens: File, Scene, Zone, Views, Options, Action and Results. The File screen is used to load and save rad input files (a.k.a. project files). The Scene screen is used to name the Radiance input files associated with a particular project. The Zone screen is used to assign rad variables specific to the section of the model being rendered. The Views screen is used to define specific views to be rendered and set the picture file names and dimensions. The Options screen is used to adjust rendering quality and other parameters. The Action screen is used to initiate interactive and batch renderings. The Results screen is used to display, convert and print the rendered Radiance pictures.
If trad is called with no rad input file name on the command line, it will start with the File screen and you must enter a valid project file before you will be allowed to continue. If rfile is given, then trad attempts to open this file. If no such file exists, trad assumes you are creating a new file by this name and goes to the Scene screen so you may identify the appropriate Radiance input files. If the file exists but not all renderings have been finished, trad goes first to the Action screen, assuming you will want to do something. If the file exists and all renderings have completed and are up-to-date, trad goes to the Results screen so that you may examine the final pictures.
Trad includes an extensive help facility, which may be accessed either by pressing the "HELP" button and searching through the category and topic menus, or by holding the Control key and pressing the left mouse button on the mysterious widget (i.e. the button, entry window, or list box you are curious about).
To compile the Tcl/Tk package, download the files "tcl7.4.tar.Z" and "tk4.0.tar.Z" and uncompress and untar them. Then, follow the instructions in the README file in the tcl7.4/ directory to configure the Makefile for your system and install the software. (Usually, it is best to do this as root or have it done by your system administrator if you do not have root privileges.) Then, do the same in the tk4.0/ directory.
Trad should run without modification once this is done correctly.
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