[DirectX 8.1 C/C++ Programmer's Reference] Clouds, Smoke, and Vapor Trails (36.2445111014905%)
DirectX 8.1 (C++) > DirectX Graphics > Programmers Guide > Using Direct3D > Rendering > Fog, Alpha Blending, and Depth Buffers > Alpha Blending
[DirectX 8.1 Visual Basic Programmer's Reference] Clouds, Smoke, and Vapor Trails (34.580424414184%)
DirectX 8.1 (Visual Basic) > DirectX Graphics > Programmers Guide > Using Direct3D > Rendering > Fog, Alpha Blending, Depth Buffers > Alpha Blending