With grDevices package, I do the following to generate a greyscale:
newcols <- colorRampPalette(c("white", "black")) #generates palette from
white to black
#OR
newcols <- colorRampPalette(c("grey90", "grey10")) #generates palette
frome light to dark grey for better visibility
Then in the wireframe() command type the argument: col.regions=newcols(100)
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