plot_surface defaults?

1. Sorry if I miss this in the docs, but what are
the default values of rstride and cstride?
It seems these automagically limit the amount
of data used by the surface plot.

2. Also, what is the right way to set alpha for
the surface? If I use an alpha keyword for
plot_surface, I cannot seem to push the alpha
above the default, which looks to be about 0.5.
(I can however make the surface more transparent.)

3. In interactive mode, the "Home" button does not
seem to restore the original perspective?
(TkAgg backend.) Should it? (I'd like it to.)

Btw, I really like the surface plots!

Alan Isaac