[DirectX 7 Programmer's Reference] Range-Based Fog (18.536036036036%)

Microsoft DirectX 7.0 > Direct3D > Direct3D Immediate Mode > Direct3D Immediate Mode Essentials > Common Techniques and Special Effects > Fog > Vertex Fog

[DirectX 6 Programmer's Reference] Range-Based Fog (15.86115527292%)

DirectX Foundation > Direct3D Immediate Mode > Direct3D Immediate Mode Essentials > Common Techniques and Special Effects > Fog