Grey Scale Bump Maps, Allowed?

Does source allow grey scale Bump Maps? I know how to make a normal map, however a normal map would be insanely complicated with the geometry that I have. However, I do have a Grey Scale bump Map, can I use that in source (specifically Gmod)?

I tried to use a grayscale once, and had no success… so I don’t belive it is possible in source. However I might be wrong.

You are just going to have to settle with a normal map, unless you know how to code a custom shader.

If you have a height map, you can probably just plug it into a filter or something. Or as a shitty alternative; color it light bluish purple.

Just use Valve’s height2normal tool.