About: http://webisa.webdatacommons.org/89364125

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	Operating under the assumption you can use them, here is a vertex and fragment shader that will create a grey radius fog around your character's location (with simple texturing).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com