A NodeMaterial is a shader described as a graph of blocks, compiled by Babylon.js 89,603 to GLSL or WGSL: the same idea as Three.js 30,815 's TSL (TSL Nodes). The Node Material Editor 89,603 (NME) edits such graphs visually; here you build one in code, read its generated shader, save it as JSON and give BookNest's shelves a highlight.