Stained glass / Voronoi fading

These drawings are built up in layers, beginning with a fountain pen (filled with yellow ink and dipped in blue every so often for the blue-to-green gradient), followed by black fineliner, white pen, and silver outlines. Aligning the different pens is quite tricky and when I don't get it quite right, I end up with a 3D effect with the black lines being slightly offset from the silver.

I first generate a voronoi pattern by randomly selecting points within the area and then relaxing the resulting mesh a little (LLoyd's algorithm). The shading is designed to follow a 2D Perlin noise field. The cells are sorted by desired hue and split into groups, where each group begins with a dip in the blue ink and draws maybe 10 or so cells, so the ink will gradually fade towards yellow. However, this process is not quite predictable as the ink in the dipping well mixes with that in the cartridge over time as well, so later groups tend to be more yellow than blue.

A5 (148x210mm) Bristol paper.
Blue and yellow fountain pen inks (Lamy M nib), Black Pigma Micron 05, White Gelly Roll 08, Metallic Silver Gelly Roll.
About an hour of drawing time between the various layers.

#penplotter #penplotterart #fountainpen #gelpen #fineliner #drawing #shading #voronoi #gradient #blue #green #stainedglass

7 months ago