trans3d {grDevices} | R Documentation

## 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 homogenous 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)`.

### See Also

`persp`

### Examples

    ## See  help(persp) {after attaching the 'graphics' package}
    ##      -----------

[Package grDevices version 2.3.1 Index]