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[DX9] fog won't turn on

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I added this bit of code into the program

device->SetRenderState(D3DRS_FOGENABLE, true);
device->SetRenderState(D3DRS_FOGCOLOR, D3DCOLOR_XRGB(255, 255, 0));
device->SetRenderState(D3DRS_FOGTABLEMODE, D3DFOG_EXP);
device->SetRenderState(D3DRS_FOGDENSITY, 0.1);

No fog at all when I run the program. I tried changing fog's density from 0.1 to 0.99, nothing at all. If I put in more than that, still nothing. Less than 0, everything but background is filled with yellow I set for the fog. I changed from FOGTABLEMODE to FOGVERTEXMODE, from exp to exp2, to linear. I tried everything I can think of. but the fog just doesn't show up at all. The model goes beyond the far plane. I'm quite sure I did something wrong here. What could I do wrong?

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Read the documentation for D3DRS_FOGDENSITY (http://msdn.microsoft.com/en-us/library/windows/desktop/bb172599%28v=vs.85%29.aspx):
Values for this render state are floating-point values. Because the IDirect3DDevice9::SetRenderState method accepts DWORD values, your application must cast a variable that contains the value, as shown in the following code example.m_pDevice9->SetRenderState(D3DRS_FOGDENSITY, *((DWORD*) (&fFogDensity)));[/quote]

Also, this kind of fog will flat-out not work at all with SM3 or higher hardware: http://msdn.microsoft.com/en-us/library/windows/desktop/bb147365%28v=vs.85%29.aspx#Fog_Depth_and_Shading_Mode_Changes

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