Sets the background plane.

Prototype declaration:

> `

>     KMSTATUS KMAPI
>     kmSetBackGroundPlane(
>             IN  PVOID           pVertex[3],
>             IN  KMVERTEXTYPE    VertexType,
>             IN  KMINT32         StructSize
>     );

> `

Description:

>     This function registers a background plane.
>     kmSetBackGroundRenderState needs to be called before this function.

Parameters:

>     pVertex[3](input)
>             This parameter is a pointer to a vertex data structure that indicates coordinates on a background plane.

>     VertexType(input)
>             This parameter indicates the data type of vertex data.

>     StructSize(input)
>             This parameter indicates the data type of vertex data.

Return values:

> Value | Explanation
> KMSTATUS_SUCCESS | Success