Controlling quality of 3d plot

[oz123]

Hi,
I was wondering how I can get a better quality images with octave.
Here is an example of image produce with matlab


And the same code produced a terrible picture with octave:


I would like to change the sampling rate of the slices, and also be able to control the fonts displaying.

I use octave 3.0.5 on debian,
I attached also the code to produce the above plots
Class_12_May.m