# trans3d

0th

Percentile

##### 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

x,y

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

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