State Parameters and Transitions

Something like this gains access to a lot of view parameters:

for n in dir(chimera.viewer): print n, eval('type(chimera.viewer.%s)' % n)

Some tips in the ​programming FAQ are useful (esp, items 4, 5, 7-10). Note, take a look at the code for chimera.update.checkForChanges(), as this may be helpful in detecting changes for transitions and for checking the validity of state parameters.