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D.9.4.1 plotRotated

Procedure from library surfex.lib (see surfex_lib).

plotRotated(poly p, list coords, list #)
This opens the external program surfex for drawing the surface given by p, seen as a surface in the real affine space with coordinates coords. The optional int parameter can be used to set plotting quality.

coords is a list of three variables.
The basering is of characteristic zero and without parameters.

LIB "surfex.lib";
// An easy example: a surface with four conical nodes.
ring r = 0, (x,y,z), dp;
poly cayley_cubic = x^3+y^3+z^3+1^3-1/4*(x+y+z+1)^3;
//     plotRotated(cayley_cubic, list(x,y,z));
// A difficult example: a surface with a one-dimensional real component!
poly whitney_umbrella = x^2*z-y^2;
// The Whitney Umbrella without its handle:
plotRotated(whitney_umbrella, list(x,y,z));
// The Whitney Umbrella together with its handle:
plotRotated(whitney_umbrella, list(x,y,z), 2);