Heart (half)
(c of 2 makes a full heart, but with two hairpin curve regions.)
_FxGraph3D a*16*sin(c*v)*sin(c*v)*sin(c*v);a*(13*cos(c*v)-5*cos(2*c*v)-2*cos(3*c*v)-cos(4*c*v));0;0;1;0;3.141592653589793;0;50;1;1;1;UV