how to set graphics backend

[Qianqian Fang]

hi

I am curious to learn how to set a graphics backend
in octave. The default "gnuplot" gives me very poor
image quality and slow speed when plotting triangular
mesh/surfaces/patch objects. I want to play with a
few alternatives. I found plplot, and installed it on
my Ubuntu box, but running backend ('plplot') gave
me an error. No documentation was found that can get
me around.

Any other backends are good for surface/mesh plotting?
I remember jhandles is another backend, but could not
find installation instructions.

please help, thanks

Qianqian