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D3D lighting issue

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The way I get it - if I have set an ambient light, any material that reflects ambient should be visible. Specifically the code looks like this:

D3DMATERIAL9 material;
material.Ambient.a = material.Ambient.b = material.Ambient.g = 255;
gpu->SetRenderState( D3DRS_AMBIENT, D3DCOLOR_ARGB(255,255,255,255) );

But the object is still dark.
I suppose that most of the lighting setup is in order since adding

material.Emissive = material.Ambient

makes the object visible.

What could I possibly be missing?

P.S. I'm using Visual C++ 2008 Express
P.P.S. Here's the full code [url=""][/url] its a bit messy, the setup starts at line 212

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I finally figured this out. The problem was that I declared the [color=#1C2837][size=2]D3DMATERIAL9 structure within a method. And later it was out of scope or something. Once I made it a global variable, ambient lighting started working. [/size][/color]
[color=#1C2837][size=2]Why did the emissive light work with the previous construction, I still have no idea.[/size][/color]

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There is no possible value of the R component that would make the material completely dark.

That said, I had tried it with all components set and in tens of different variations until after a long and painful process of taking a working example and transforming it step by step to what I had wrote, I noticed that where the material is declared makes the difference.

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