search for: tp23480170p23481038

Hi, I am trying to plot a 3d scatter plot using the rgl package but am having trouble. I have a matrix containing x, y and z co-ordinates and a fourth element related to a count variable. I would like to plot the points using plot3d with the sizes of the points related to the fourth element in the matrix. Is this possible with plot3d or do I need to use something else? I include a small example