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.
A logical value indicating the current default for use of the null device.
This function is checked by the initialization code when the rgl package
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
library(rgl) (or other code that
loads rgl), and it will not fail in its attempt at initialization.
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