Returns the material string associated with the particular quest. The material string is non-nil if this quest uses a custom texture other than the default "Parchment" texture.
material = GetQuestBackgroundMaterial();
- - The material string for this quest, or nil if the default, "Parchment", is to be used.
This texture is used to paint the background of the Blizzard Quest Frame. It does not appear in the Quest Log, but only when initially reading, accepting or handing in the quest.