view {
    units [3]< 1, 1, 1 >;
    dotsPerUnit [3]< 150, 150, 9 >;
    viewDepth 7; 
    viewport {
        portal myportal {
            universe u4 ;
            center [1]< -18 >;
        };
        channels [3]< @ myportal 0 , @ myportal 1 , @ myportal 2 >;
    };
    image png { common { basename duocircle-4; }; };
};
universe u4 {
    dimensions 4;
    
    ambientLight {
        channels [3]< 0.1 , 0.1 , 0.1 >;
    };
    skyColor {
        channels [3]< 0.2 , 0.2 , 0.6 >;
    };
    light {
        position [4]< -10, 5, 14, -10 >;
        falloff 0.0;
        color {
            channels [3]< 0.4 , 0.4 , 0.4 >;
        };
    };
    light {
        position [4]< -14, -8, 5, 10 >;
        falloff 0.0;
        color {
            channels [3]< 0.5 , 0.5 , 0.5 >;
        };
    };
    


    object extrusion {
        dimensions 4;
        
    object intersection {
        object cylinder {
            roundDimensions 2;
        };
        object cylinder {
            roundDimensions 2;
            base {
                orientation [4]<
                    [4]< 0, 0, 1, 0 >,
                    [4]< 0, 0, 0, 1 >,
                    [4]< 1, 0, 0, 0 >,
                    [4]< 0, 1, 0, 0 >
                >;
            };
        };
        base {
            color {
                channels [3]< 0.8 , 0.1 , 0.8 >;
                specularness 0.3;
            };
        };
    };

    };
};