trans3d: 3D to 2D Transformation for Perspective Plots

Description

Projection of 3-dimensional to 2-dimensional points using a 4x4
viewing transformation matrix. Mainly for adding to
perspective plots such as persp.

Usage

trans3d(x, y, z, pmat)

Arguments

x, y, z

numeric vectors of equal length, specifying points in
3D space.

pmat

a \(4 \times 4\) viewing transformation matrix,
suitable for projecting the 3D coordinates \((x,y,z)\) into the 2D
plane using homogeneous 4D coordinates \((x,y,z,t)\);
such matrices are returned by persp().

Value

a list with two components

x,y

the projected 2d coordinates of the 3d input (x,y,z).