In Blender, what is the first step to begin creating the painterly effect?

Add two material slots to the object, naming one 'painter' and the other 'outline'.

What is the purpose of the Voronoi texture node in creating the painterly effect?

The Voronoi texture creates a faceted look, mimicking the appearance of brushstrokes.

By using a Mix Color node with a Noise Texture to roughen the edges of the Voronoi texture.

The Mapping node allows for easy control of the scale and position of the brushstroke texture.

I can create a procedural painterly effect on a 3D object in Blender using shader nodes.

1
To create a procedural painterly effect in Blender, begin by adding two material slots to your object, naming one 'outline' and the other 'painter'.
2
The painterly effect is achieved by using a Voronoi texture to create a faceted look, then roughening the edges with a mix color node and a noise texture.
3
To add brush strokes, use a paintbrush normal map and mix it into the texture, adjusting the scale and blending modes for the desired effect, and set the color space to non-color.