3D-Plotting problem

When i plot my 3D models using hide objects there appear triangels in every surface that's round .
What must i do to have less (or none) triangels in my round surfaces .

 

[butelja]

Change the DISPSILH variable from the default value (0) to 1. To do this, just type DISPSILH at the command line, and then change the value.

A related problem I've come across is having curved solids look very faceted. This is changed in a twostep process. First, set FACETRES to 1.0. Then set VIEWRES to 2000 or greater. These two steps must be done togeter, as FACETRES only corresponds to VIEWRES setting if the FACETRES value is 1.0.