visualizing 3d data in 2d plot

General
1

I need to make a 2D plot for 3D data (for example a multivariate distribution and its density values) in a way that the third dimension (i.e. density values) is shown by a shaded area. any idea?

library(mvtnorm)
library(Compositional)

pairedData = rmvnorm(n=20,mean = c(0,0),sigma = diag(2))
z = mkde(pairedData, h=0.1)

2

Lots of examples here. near the bottom.

3

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