[R] Compare two 3d plots

[Ab Hu]

I'll check that book out and/or get help from the authors. But i was still
hoping there is some basic way to compare these 3d plots using R. 
By the way, I figured out i can draw these plots using command "image" and
get a gradient heat map or topography map with gradients. Is there a
function in R to process the colors in these images and give me the
difference between two images?
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