[R] how to draw a perspective pyramid

[dxc13]

Dear list,

I am trying to construct a perspective plot of a 2D triangle, or pyramid.  I
can easily do the one dimensional plot (code below), but I can't figure out
how to do it in a perspective plot for two input variables.  Does anyone
have a simple solution? 

Thanks!
Derek

#code for a triangle
u <- seq(-1,1,.001)
tri <- (1-abs(u))
plot(tri~u,type="l",main="Second Iteration Kernel: Two Input
Variables",lwd=2,
	xlab="x",ylab="y",col="blue")

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