When HT_Advanced_Options  is set to Stereo,  Anti-Alias or All,  hardware capability of specific drivers can be utilized, that is not normally available in Heidi. For example, the OpenGL and Direct 3D drivers' anti-aliasing options can be set in the rendition via the set_advanced_options method which will tell the drivers to use the options, while Heidi itself will continue to draw normally. There is also no effect on Heidi if the driver is not in use and the option is set. The OpenGL anti-aliasing option will work for 3D and 2D plus Z.

The Stereo option allows stereo for OpenGL in 3D mode only. As this is a hardware option, it has no effect on Heidi.
 

For more information, see class HT_Rendition.

class HT_Advanced_Options {
    public:
        enum Enum {
            None       =  0x00,

            Stereo     =  0x01,
            Anti_Alias =  0x02,

            All        =  0x03
        };

     ENUM_BIT_CLASS_FUNCTIONS (HT_Advanced_Options)
};