NIF文件格式文档

AlphaFormat

An unsigned 32-bit integer, describing how transparency is handled in a texture.

Number	名称	说明
0	ALPHA_NONE	No alpha blending; the texture is fully opaque.
1	ALPHA_BINARY	Texture is either fully transparent or fully opaque. There are no partially transparent areas.
2	ALPHA_SMOOTH	Full range of alpha values can be used from fully transparent to fully opaque including all partially transparent values in between.
3	ALPHA_DEFAULT	Use default setting.