swf_lookat Define a viewing transformation voidswf_lookat floatview_x floatview_y floatview_z floatreference_x floatreference_y floatreference_z floattwist The swf_lookat function defines a viewing transformation by giving the viewing position (the parameters view_x, view_y, and view_z) and the coordinates of a reference point in the scene, the reference point is defined by the reference_x, reference_y , and reference_z parameters. The twist controls the rotation along with viewer's z axis.