How to add gradient and rotate each cell of the grid?

Question

I am trying to add a gradient to each cell and rotate each grid cell.

The grid is currently separated into Less Than and Greater Than nodes.

Since the grid is separated there is input Gradient Less Than to control the gradient amount for cells which is less than 0.5 and input Gradient Greater Than to control the gradient amount for cells that is greater than 0.5.

In the same way the input Angle Less Then should control the rotation for cells which is less than 0.5 and input Angle Greater Then should control the rotation for cells that are greater than 0.5

Note: The rotation of gradients should be random for each cell.

Answer 1

A bit similar to the Wizard's answer, but this time using the random-per-cell value that Voronoi gives us in 'Color':

Ooops.. The Multiply is by 2*pi (or tau)

The cluster on the left, above, gives rotated UV's per-cell, as illustrated on the left, below:

The center example shows a square image rotated by the cluster and shifted appropriately.. the right example shows an X gradient in the same frame, again shifted in the (rotated) coordinates, to put black at X = -0.5

Answer 2

You can use Voronoi texture for that:

If you don't want any flat color, as explained by Gordon Brinkmann in your other question, you need to normalize the range