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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:

  1. Create new blender file w/ default cube
  2. Click on World tab in properties.
  3. Expand World subsection
  4. Set Ambient to pink or something
  5. 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.

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Okay, it appears that the export script just applies the ambient property in the shading sub section, which is a single value between 1 and zero that's just a multiplier for how much the global ambience the material receives. It puts the single value as the component for each of the RGB values for ka upon export.

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