# Examples of demo curves and surfaces
# line 1: equation.
# line 2: name of the picture.
# line 3: eventual parameters
# line 4: description.

: x^2+y^2-z^2=0
 cone.jpg
 
 Quadratic cone.

: x^2+y^2+z^2+2*x*y*z=1
 foursing.jpg
 
 Cubic with 4 singular points.

: x^4+y^4+z^4+5*x*y*z=0
 quartic.jpg
 
 A quartic surface with 4 branches touching at the origine.

: x^3+y^3+z^3=x+y+z
 cubicholes.gif
 menu=expert&size=100&zone=1.5&aquality=3&hangle=25+360s&vangle=35&axes=0&soil=0
 Animated plot: a cubic surface with rotation.
 
: x^2*y^2+y^2*z^2+z^2*x^2=x^2+y^2+z^2-0.75
 zoom.gif
 menu=expert&size=100&zone=exp(s)&contour=2&aquality=3&axes=0&soil=0
 Another animated plot: a quartic surface with zoom. Here it is the range of variables which varies from $(m_pm)1 to $(m_pm)2.7.

