Walter Welebit, whose Gotham-based film company produced promotional pics for such corporate entities as Boeing and Air France, died July 23 at the Centers for the Living and Rehabilitation in Bennington, Vt. He was 81.Welebit also directed, co-produced and co-wrote the 1969 film “Children’s Games,” which won a gold medal at the Venice Film Festival. Born in Milwaukee, he earned the rank of corporal while serving as a U.S. Army flight engineer in the Pacific arena during World War II. After the war, he worked as a correspondent for the Associated Press in Belgrade and subsequently trained and worked as a still photographer before moving into film. Welebit is survived by a son and a daughter.