is there a way to visualize 3D normal distributions?

Hi all,

How do I visualize a contour of a tri-variate normal distribution?

I just like to see the ellipsoid very much. I hope there is a easy way or
existing method in R.

The misc3d package includes a function for 3d contour plots; that should 
do what you want.

There are some errors in the rendering when plotting multiple contours, 
due to limitations in rgl (the underlying package that does the 
rendering).  The problem is that transparent surfaces need to be 
rendered in order from back to front, and rgl doesn't do that.  But it 
still looks good.

Duncan Murdoch