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The routine returns the name of the center of the given sphere, or polyhedron c.

If c is a stellated polyhedron (i.e., geom3d[IsStellated](c) returns true), center(c); returns the center of the core of the given stellated polyhedron.

if c is a facetted polyhedron (i.e., geom3d[IsFacetted](c); returns true), center(c); returns the center of the case of the given facetted polyhedron.

If the first optional argument cn is given, the name of the center c becomes cn.

Use coordinates or detail for more details on the center.

The command with(geom3d,center) allows the use of the abbreviated form of this command.

$\mathrm{with}\left(\mathrm{geom3d}\right)\:$

$\mathrm{sphere}\left(s\,x^2+y^2+z^2+x+y+z-3=0\,\left[x\,y\,z\right]\,'\mathrm{centername}'=o\right)$

$s$

$\mathrm{center}\left(s\right)$

$o$

$\mathrm{coordinates}\left(\right)$

$\left[-\frac{1}{2}\,-\frac{1}{2}\,-\frac{1}{2}\right]$

$\mathrm{center}\left(\mathrm{o1}\,s\right)$

$\mathrm{o1}$

$\mathrm{center}\left(s\right)$

$\mathrm{o1}$

$\mathrm{coordinates}\left(\right)$

$\left[-\frac{1}{2}\,-\frac{1}{2}\,-\frac{1}{2}\right]$