Take the 2-minute tour ×  Is there any built-in functionality in
TiKz/PGF that allows for drawing quadric surfaces, i.e. surfaces
given by the equation  Ax^2 + By^2 + Cz^2 + Dz = E?  I'm aware
of the raw gnuplot command enabling the use of virtually every
gnuplot command (at least to my knowledge).  I tried using the
following command:  \draw[thick] plot[raw gnuplot] function{set
urange [0:2*pi]; set vrange [0:pi]; set parametric; set
isosample 40; splot cos(u)*sin(v)/3, sin(u)*sin(v), cos(v)};
but the result is less than satisfactory.  share|improve this
question welcome to TeX and friends! I hope you enjoy your stay
here. Use four spaces inthe begining of a line (or select and
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note that as your badge appears at the end of your entry,
there's no need to sign-off. –  Yossi Farjoun Jan 25 '11 at
11:41 Thank you for the pointers. –  Marius Jan 25 '11 at 11:44
add comment  2 Answers  up vote 8 down vote accepted  You might
be interessted in PGFplot