Why SUModelGetMaterials do not give the whole materials

i want to export a skp file. i find the material info got from SUModelGetMaterials is not accurate. some of materials are lost.
To correct this, i define materials got from SUModelGetMaterials as global materials, then when i transfer the model, i check if the material i check out is in the global materials.i define materials i found later as local materials.(p.s. for this reason, the examples in sdk have a bug that the program loses local materials,e.g. skp2xml xml2skp)

i want to know the causes. if someone can give some guides, i will be really appreciate

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