is Pivot in camera view ?

You could use

Function SafeEntityInView(Cam, Ent)

    EntX# = EntityX(Ent, True)
    EntY# = EntityY(Ent, True)
    EntZ# = EntityZ(Ent, True)
    CameraProject(Cam, EntX, EntY, EntZ)

    ScreenX = ProjectedX()
    ScreenY = ProjectedY()
    if (ScreenX >= 0) and (ScreenY >= 0) and (ScreenX < GraphicsWidth()) and (ScreenY < GraphicsHeight()) then
        return True
    else
        return False
    end if
end function

Obviously you should store the GraphicsWidth and GraphicsHeight in some global variables so the functions do not have to called everytime. Especially if this function is called often.

yinch'03