CONST_D3DCOLORMODEL

The CONST_D3DCOLORMODEL enumeration is used to define the color model in which the system will run. A driver can expose either or both flags in the CONST_COLORMODEL member of the D3DDEVICEDESC7 type.

Enum CONST_D3DCOLORMODEL
    D3DCOLOR_MONO = 1
    D3DCOLOR_RGB = 2
End Enum

D3DCOLOR_MONO

Use a monochromatic model (or ramp model). In this model, the blue component of a vertex color is used to define the brightness of a lit vertex.

D3DCOLOR_RGB

Use a full RGB model.