Nothing
.onAttach <- function(libname, pkgname) {
packageStartupMessage(
"The 'tkrgl' package functions have been moved to the 'rgl' package.
Their names have been prefixed with 'tk', i.e. they have been
renamed to 'tkpar3dsave', 'tkspin3d', and 'tkspinControl'. Please
switch to that package as 'tkrgl' is no longer maintained.")
}
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