The material files referenced by models/*.obj files are missing.

For my own purpose, I made them myself by hand :), here they are so others can use:

oak5.mtl:

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[code]
newmtl oakstamm2
Ns 96
Ka 0.000000 0.000000 0.000000
Kd 0.800000 0.800000 0.800000
Ks 0.500000 0.500000 0.500000
map_Kd oakbark.jpg
#or map_Kd oakbark_burnt.jpg
[/code]
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oak1_Scene.mtl:

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newmtl oakstamm
Ns 96
Ka 0.000000 0.000000 0.000000
Kd 0.800000 0.800000 0.800000
Ks 0.500000 0.500000 0.500000
map_Kd oakbark.jpg
#or map_Kd oakbark_burnt.jpg

newmtl oakblaetter
Ns 96
Ka 0.000000 0.000000 0.000000
Kd 0.800000 0.800000 0.800000
Ks 0.500000 0.500000 0.500000
map_Kd oakleaf_fall.tga
#or map_Kd oakleaf_light.tga
#or map_Kd oakleaf_dark.tga
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Given Ns, Ka, Kd, Ks colors are pretty dumb default material. Given map_Kd use appropriate textures on appropriate parts.