In fact, I have several equations like this : x^2+y^2+x+y+x*y+z^2-1=0 I can express z=sqrt(1-...) but in a general case... -- View this message in context: http://mailinglists.scilab.org/How-to-plot-3d-implicit-surface-tp4025307p4025311.html Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com.