edgeShadePermille property
How much darker the extruded sides are than the face, × 1000 of OKLab lightness (NeoPOP), when KeyColors.edge is derived at render time. Reused: Claymorphism's inner shade, Y2K's deep band under the gloss cap, Paper & ink's hatch opacity, Vaporwave's bevel shade.
Implementation
final int edgeShadePermille;