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When selecting the color of a material, I have the option to change diffuse and specular color. Where do I change the ambient color?

When I export to .obj/.mtl, I get Ka 0.000000 0.000000 0.000000, which I then need to adjust manually.

How can I set this value in Blender?

According to phong model, every object has ambient, diffuse, and specular color. That's why exporting to .obj/.mtl has Ka Kd Ks elements. However, in blender I can only set specular and diffuse color. How can I set ambient color resulting non-zero values of Ka after exporting to .obj/.mtl?

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    $\begingroup$ Ambient color? Under the world settings you can change that, but I don't know that it exports . . . $\endgroup$ – VRM Jan 22 '15 at 12:22
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    $\begingroup$ @NoviceInDisguise it does. $\endgroup$ – gandalf3 Jan 22 '15 at 18:36