# trans3d

##### 3D to 2D Transformation for Perspective Plots

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

.

- Keywords
- dplot

##### 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

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

.

##### See Also

##### Examples

`library(grDevices)`

```
<!-- %% it would be nice to have an independent example -->
## See help(persp) {after attaching the 'graphics' package}
## -----------
```

*Documentation reproduced from package grDevices, version 3.4.1, License: Part of R 3.4.1*

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