Bump mapping is not visible in ambient light (I mean the "ambient" keyword
in the finish statement) because it's assumed that ambient light comes from
everywhere, so there are no shadows. When you remove diffuse, there is only
ambient light left, along with a vague specular that -does- react to bump
mapping. But maybe it's too vague to be seen in this particular scene.

Better results can be obtained by using radiosity (global illumination) to
replace "ambient" light.

Regards,
Hugo

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