Misc tweaks for defaults.
Misc tweaks for defaults.

JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering,JosephCottam/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering