Here is a very simple shader for M4, using the color map, but not the bump map yet.

Look at the bump map - it is almost entirely mid-gray, or .5. The variations are tiny.

(Note that this is a terrible bump map - practically useless in fact. But I find it useful here to demonstrate the bump bloat problem.)

In this image, I show you the shader and the render.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)