I'm using 2.76b on ubuntu. When I export to a wave front object, it will always set the material's ambiance (ka) as white. I've changed the World ambient color to multiple different colors, and it always exports as white.
Steps I use:
- Create new blender file w/ default cube
- Click on World tab in properties.
- Expand World subsection
- Set Ambient to pink or something
- File -> Export -> WaveFront
When I go to open up the .mtl file, it will still show as all 1's for the ka component for any material.