export problem to OBJ - doubled materials with _NONE suffix in .mtl

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Hi,

this is my model in blender with material named as “outer_paint” with 1 img texture.

ScreenShot019.jpg1365×673 454 KB

.
But this material is doubled in .mtl file. There is no problem with other materials and textures only with this 1. Has anybody any idea why and what the “_NONE” means in this case? Thanks. :frowning:

newmtl outer_paint
Ns 96.078431
Ka 0.000000 0.000000 0.000000
Kd 0.800000 0.800000 0.000000
Ks 0.500000 0.500000 0.500000
Ni 1.000000
d 1.000000
illum 2
map_Kd textures\outer_paint_solo.png

newmtl outer_paint_NONE
Ns 96.078431
Ka 0.000000 0.000000 0.000000
Kd 0.800000 0.800000 0.000000
Ks 0.500000 0.500000 0.500000
Ni 1.000000
d 1.000000
illum 2
map_Kd textures\outer_paint_solo.png