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  Projection of 3-dimensional to 2-dimensional points using a 4x4
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  Projection of 3-dimensional to 2-dimensional points using a 4x4
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  viewing transformation matrix.  Mainly for adding to
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  viewing transformation matrix.  Mainly for adding to
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  perspective plots such as \code{\link{persp}}.
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  perspective plots such as \code{\link{persp}}.
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}
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}
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\usage{
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\usage{
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trans3d(x,y,z, pmat)
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trans3d(x, y, z, pmat)
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}
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}
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\arguments{
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\arguments{
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  \item{x, y, z}{numeric vectors of equal length, specifying points in
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  \item{x, y, z}{numeric vectors of equal length, specifying points in
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    3D space.}
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    3D space.}
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  \item{pmat}{a \eqn{4 \times 4}{4 x 4} \emph{viewing transformation matrix},
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  \item{pmat}{a \eqn{4 \times 4}{4 x 4} \emph{viewing transformation matrix},