terrainLambert

Lambertian terrain shading strength in [0, 1]. 0 (default) keeps classic unshaded imagery. Non-zero shades terrain with the engine lighting model (earth.worldwind.render.program.LightingGlsl) from smooth per-vertex terrain normals (built by earth.worldwind.globe.terrain.TerrainTile.getNormalBuffer, relief resolution follows terrain mesh LoD): sun-averted slopes darken toward the scene ambient, a hillshade-style relief whose contrast intermediate values scale down. Received shadows then attenuate the direct sun term instead of multiplying the whole albedo by ambientShadow, so shadowed terrain reads much lighter. Fades out across the terminator band with the shadows.