Does directional lighting affect objects that are NOT textured? All examples/tutorials i see/read about always have texture mapped objects.
WebGL - Directional lighting without texture mapping?
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No, WebGL does what you program it to do.
Directional lighting is usually computed as a multiplier (0 = black, 1 = white) and is then multiplied by whatever color you want to output. If that color is a solid color instead of a texture you don't need textures.
But it's up to you to write shaders that use the lighting the way want it to do the calculations and combine the results.