3.1.5.24.3 HostWindow_SetPerspectiveSettings
The HostWindow_SetPerspectiveSettings message sets the viewing perspective of the window.
At: The center of the object you want to look "at".
Eye: The location of the eye (camera).
The fields of the HostWindow_SetPerspectiveSettings are specified in section 2.2.4.23.3.
The common header fields are specified in section 2.2.4.