About: http://webisa.webdatacommons.org/19124571

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	gluUnproject() does not take the viewport matrix (there is not actually any such thing as far as OpenGL is concerned), it takes the viewport parameters. ie the stuff you pass in glViewport(): x, y, width, height.
http://www.w3.org/ns/prov#wasQuotedFrom	java-gaming.org