I have observed that each of the following materials from Substance Source has two different normal format parameters, "Normal Blend Format" and "Normal Format":
- Acajou Wood Varnished
- Aged Osb Wood
- Birch Alba Wood Varnished
- Ebony Reconstituted Wood Varnished
- Natural Mdf Wood
- Pine Monterey Wood Varnished
- Walnut Wood Varnished
It seems that if I go to Edit|Preferences... and set my "Default Normal Map Format" to OpenGL, then when I instance one of the above materials, the "Normal Format" defaults to OpenGL, but the "Normal Blend Format" defaults to DirectX. I am only getting one normal map output, so why are there two separate normal format parameters with different defaults?