# rgl.useNULL

0th

Percentile

##### Report default use of null device.

This function checks the "rgl.useNULL" option if present, or the RGL_USE_NULL environment variable if it is not. If the value is TRUE or a string which matches yes or true in a case-insensitive test, TRUE is returned.

##### Usage
rgl.useNULL()
##### Value

• A logical value indicating the current default for use of the null device.

##### Note

This function is checked by the initialization code when rgl is loaded. Thus if you want to run rgl on a system where there is no graphics support, you should run options(rgl.useNULL = TRUE) or set the environment variable RGL_USE_NULL=TRUE *before* calling library(rgl) (or other code that loads rgl), and it will not fail in its attempt at initialization.

open3d and rgl.open.
rgl.useNULL()