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An object p of type Sphere_point<R> is a point on the surface of a unit sphere. Such points correspond to the nontrivial directions in space and similarly to the equivalence classes of all nontrivial vectors under normalization.
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ring number type.
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creates some sphere point.
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creates a sphere
point corresponding to the point of intersection of the ray starting
at the origin in direction (x,y,z) and the surface of S2.
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Access to the coordinates is provided by the following operations. Note that the vector (x,y,z) is not normalized.
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| the x-coordinate. |
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| the y-coordinate. |
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| the z-coordinate. |
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| Equality. |
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| Inequality. |
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| returns the antipode of p. |