Table Of Contents

Graph ► Tasks ► Density

The Density Task takes a sequence of scalars and presents them as boxes on a uniform 3D grid. The scalars have values between 0 and 1 and any value outside that range (especially -1) means "no density". By selecting Z Slice in the Preference tool the densities can be scanned in the z-direction one x-y plane at a time. Notice these peculiarities:

• The number of densities must equal the dimension entries on the task multiplied together.

• This task plots density values, a.k.a: densities, but is called Density (singular) because it is thought of as a continuous density "field" even though that terminology is not particularly right or appropriate.

• The color map in the template is key to making a good density plot. In particular, transparency is important to see within the density field. Many times a particular density is of interest and the color map can be adjusted so that that particular density value can show up as a unique color in the color map.

• Experimenting with the Volume 3D Data Graphic in Graph Builder might help with understanding the Density Task.

The figure below diagrams the Density task.

The 3D perspective graph is intended to give an overall qualitative indication of the data. The Z Splice point fill representation gives a more quantitative representation. Dragging the cursor over the 3D graph rotates it. While in Z Splice representation hovering the cursor over a density (in the x-y plane) shows its value and dragging the cursor scans each x-y plane successively.