Description Usage Arguments Details Value Author(s) See Also Examples

Project points from the unit sphere onto a plane orthogonal to the viewing direction.

1 | ```
orthogproj(eye, top, loc)
``` |

`eye` |
Viewpoint. A vector of length 3 (or a |

`top` |
Top point. A location which will be projected onto the |

`loc` |
Vector of length 3, or matrix with 3 columns,
or |

This function is used to obtain orthogonal projections of points on the sphere, for use in plotting 3D views of the sphere.

Each point of `loc`

is expressed
in an orthonormal coordinate system determined by the
arguments `eye`

and `top`

. The coordinate system is
such that the third (*z*) axis
passes through the eye of the viewer and the
centre of the sphere.

A vector (or matrix) giving the transformed coordinates of each point, with the first two coordinates giving the orthogonal projection.

Adrian Baddeley and Tom Lawrence

1 | ```
orthogproj(place("newyorkcity"), place("northpole"), c(1,0,0))
``` |

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