ecmascript:
function initialize()
{
    // arbitary example modification of usual node properties
    
    var newTransparency = 1.0 - ((1.0 - transparencyInitial) * indexOfRefraction);
    Browser.println ('indexOfRefraction=' + indexOfRefraction +
         ', transparencyInitial=' + transparencyInitial +
         ', transparency_changed=' + newTransparency);
    transparency_changed = newTransparency;
}

function set_transparencyInitial (eventValue)
{
   // input eventValue received for inputOutput field
    transparencyInitial = eventValue;
}

function set_indexOfRefraction (eventValue)
{
   // input eventValue received for inputOutput field
    indexOfRefraction = eventValue;
}