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 $4 x 4$ 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).