This command will make a 3D box that is white and untextured by default.
void dbMakeObjectBox(int iObject, float fWidth, float fHeight, float fDepth)
iObject is the object number, you need that number when you want to refer back to this object.
fWidth is the width of the box.
fHeight is the height.
fDepth is the depth.
If you set fWidth, fHeight or fDepth to 0 the object will become a flat plain. If you set any of these arguments to a negative value the box will appear inside-out.