isometric - a three-dimensional projection of a two parameter data array (X,Y) where the Z axis represents the number of events. This example is a 64x64 Density Plot displayed in 3D after smoothing the array with 5 iterations. isometric - a three-dimensional projection of a two parameter data array (X,Y) where the Z axis represents the number of events. This example is a 64x64 Density Plot displayed in 3D after smoothing the array with 5 iterations.