Creating a Python Calculator Filter

Use the techniques discussed in the Python Calculator section to generate a new data array for a Sphere source.

• Add a Sphere source and increase its Theta and Phi resolutions to 32.
• Add a Python Calculator and set its Expression to generate a new scalar data array that wraps from -ϖ to +ϖ around the Z axis of the sphere. The Python expression for this value passes the X and Y elements of each data point to the arctangent function:

• Use the new data array to map the color ramp to the sphere. Note that there will be a visible seam where the min and max values are adjacent.