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gnuplot> set parametric dummy variable is t for curves, u/v for surfaces gnuplot> set angle degree gnuplot> set urange [0:360] gnuplot> set vrange [-90:90] gnuplot> set isosample 36,18 gnuplot> set ticslevel 0 gnuplot> set size 0.65,1.0 gnuplot> a=1.0/(4*pi) gnuplot> fx(u,v)=cos(u)*cos(v) gnuplot> fy(u,v)=sin(u)*cos(v) gnuplot> fz(v)=sin(v) gnuplot> splot a*fx(u,v),a*fy(u,v),a*fz(v) gnuplot> set terminal png Terminal type set to 'png' Options are 'small color picsize 640 480 ' gnuplot> set output "fireball" gnuplot> replot |