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Version 5.0 The LEDA User Manual

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ool outside sphere(const d3 point& a, const d3 point& b, const d3 point& c,<br />

const d3 point& d, const d3 point& e)<br />

returns true if point e lies in the exterior of the sphere<br />

through points a, b, c, and d, and false otherwise.<br />

bool on sphere(const d3 point& a, const d3 point& b, const d3 point& c,<br />

const d3 point& d, const d3 point& e)<br />

returns true if a, b, c, d, and e lie on a common sphere.<br />

d3 point point on positive side(const d3 point& a, const d3 point& b,<br />

const d3 point& c)<br />

returns a point d with orientation(a, b, c, d) > 0.

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