FOG

by bkenwright@xbdev.net

So how do we go about adding fog to our DirectX game or application? Well you can accomplish it with a relatively few lines of code, as shown:

Code Snippet

// IDirect3DDevice8* pd3dDevice

void Fog()

{

DWORD dwColour = 0xff666666;

float start = 20.5f;

float end = 50.8f;

float density = 0.66f; // 0.0 to 1.0

pd3dDevice->SetRenderState(D3DRS_FOGENABLE, TRUE);

pd3dDevice->SetRenderState(D3DRS_FOGCOLOR, dwColour);

if(true)

{

pd3dDevice->SetRenderState(D3DRS_FOGTABLEMODE, D3DFOG_LINEAR);

pd3dDevice->SetRenderState(D3DRS_FOGSTART, *(DWORD*)(&start));

pd3dDevice->SetRenderState(D3DRS_FOGEND, *(DWORD*)(&end));

}

else

{

pd3dDevice->SetRenderState(D3DRS_FOGTABLEMODE, D3DFOG_EXP);

pd3dDevice->SetRenderState(D3DRS_FOGDENSITY, *(DWORD*)(&density));

}

Where there are two main types of fog - linear and exponential. As above I've shown how you switch fog on, and with the little if(..)else(..) statement you can choose whether you what type of fog you want.

D3DFOG_NONE 0

D3DFOG_EXP 1

D3DFOG_EXP2 2

D3DFOG_LINEAR 3

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