input mp-solid

%1'9"
figureespace(-10u,-10u,10u,10u);
Initialisation(200,20,20,15);
arcenciel:=true;
incolor:=gris;
draw Tuben("(0.5*t*sin(0.707)*cos(t),0.5*sin(0.707)*t*sin(t),-0.5*t*cos(0.707))","(0.5*sin(0.707)*(cos(t)-t*sin(t)),0.5*sin(0.707)*(sin(t)+t*cos(t)),-0.5*cos(0.707))",0.4,-25.4,508,0.1);
finespace;
end