scene prerequisites:

- The word "Plane" is used for planes that should be excluded from the directional light (sun) shadowBox calculation.

- For better exports the b_3js panel in the shader editor should be used to prepare the shader nodes for gltf

blender:

- ctrl-n to view the side-panel

- "start server" to open the viewer

- navigate & hide/show elements in outliner

- save scene, then in the side-panel set ktx2 options & export

viewer:

- ctrl-shit-p to show lil-gui's parameters panel

- ctrl-shift-i for webView dev-tools (console)

note: the exported index.html has to be served from a http server, greggman.github.io/servez for example.