# Colouring a 3D plot according to z-values

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Here is a script that colors a 3D plot according to the z value (height) of each point.

persp.withcol <- function(x,y,z,pal,nb.col,...,xlg=TRUE,ylg=TRUE) { colnames(z) <- y rownames(z) <- x nrz <- nrow(z) ncz <- ncol(z) color <- pal(nb.col) zfacet <- z[-1, -1] + z[-1, -ncz] + z[-nrz, -1] + z[-nrz, -ncz] facetcol <- cut(zfacet, nb.col) par(xlog=xlg,ylog=ylg) persp( as.numeric(rownames(z)), as.numeric(colnames(z)), as.matrix(z), col=color[facetcol], ... ) }

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