3ds Max导出OBJ的mtl贴图路径不正确

之前流程是写了一个3DSMAX插件把游戏的场景直接导出为自己定义的格式的文件，包含了顶点数据，三角形数据，贴图数据等。现在把插件从3DMAX上分离出来，先通过3DMAX导出OBJ，然后再把OBJ导出为自定义的格式。

3DSMax导出的材质mtl文件漫反射贴图路径不正确

一开始以为是一个Standardmaterial对应漫反射的Map名字一样但是贴图路径不一样导致了OBJ导出出错。写了一个把同一个Map但是对应不同的贴图路径的Map自动重命名的MaxScript脚本，导出发现结果是一样的。
一个Multimaterial下的Standardmaterial和一个Standardmaterial名字一样，但是这二个Standardmaterial的diffusemap的文件路径不一样。从而导致了OBJ导出出错。

自动转换的代码如下：

--My Dictionarystruct dict(    public keys = #(),    public values = #(),    --methods:    fn Count =     (        if keys.count == values.count then        (            keys.count as integer        )        else        (            print "Error: keys.count != values.count"            0        )    ),    fn Add key1 value1 =     (        if findItem keys key1 == 0 then        (            append keys key1            append values value1            true        )        else        (            print ("key has already been added! -->" + key1)            false        )    ),    fn Clear =     (        keys = #()        values = #()        true    ),    fn Remove key =     (        index = findItem keys key        if index != 0 then        (            deleteItem keys index            deleteItem values index            true        )        else        (            print ("cann't find the key! -->" + key)            false        )    ),    fn GetItem key =     (        index = findItem keys key        if index != 0 then        (            if keys.count == values.count then            (                values[index]            )            else            (                print "Error: keys.count != values.count"                undefined            )        )        else        (            print ("cann't find the key! -->" + key)            undefined        )    ),    fn ContainsKey key =     (        index = findItem keys key        if index != 0 then        (            true        )        else        (            false        )    )) struct mtlData(    public mapName = "",    public relalMap)openLog "D:\Users\Administrator\Desktop\3DMAX_OBJ\my_log.txt" mode:"a" outputOnly:truetexturePathToMapNameDict = dict()mapCount = 1000fn processStandardMaterial mat = (    if (mat.diffusemap != undefined) then        (            diffmap = mat.diffusemap            mapname = diffmap.name            if (diffmap.fileName != undefined) then            (                filepath = diffmap.fileName as string                if (texturePathToMapNameDict.ContainsKey filepath) then                (                    dm = texturePathToMapNameDict.getItem filepath                    --print ("change " + mat.diffusemap.name + " to " + (texturePathToMapNameDict.getItem filepath).name)                    mat.diffusemap = copy dm                    updateMTLInMedit mat.diffusemap                )                else                (                    newMapName = "Map_#" + (mapCount as string)                    mapCount = mapCount + 1                    newDiffuse = mat.diffusemap                    newDiffuse.name = newMapName                    --newDiffuse.reload()                    mat.diffusemap = copy newDiffuse                    texturePathToMapNameDict.add filepath newDiffuse                            )            )        ))fn processMultimaterial mat = (    materialList = mat.materialList    for mm in materialList do    (        if classof mm == Standardmaterial then        (            processStandardMaterial mm        )        else if classof mm == Multimaterial then        (            processMultimaterial mm        )    ))--meditMaterials--SceneMaterialsfor mat in SceneMaterials do(    if classof mat == Standardmaterial then    (        processStandardMaterial mat    )    else if classof mat == Multimaterial then    (        processMultimaterial mat    ))standardMaterialDic = dict()matNameCount = 1fn processRenameStandardMaterial mat =(    --print ("process std" + mat.name)    if (standardMaterialDic.ContainsKey mat.name) then    (        diffusemap = standardMaterialDic.getItem mat.name        if ((diffusemap == undefined and mat.diffusemap == undefined) or (diffusemap != undefined and mat.diffusemap != undefined and diffusemap.name == mat.diffusemap.name)) then        (            --print ("same" + diffusemap.name)        )        else        (            print ("change " + mat.name + " to " + (mat.name + "_" + matNameCount as string))            mat.name = (mat.name + "_" + matNameCount as string)            matNameCount = matNameCount + 1            standardMaterialDic.add mat.name mat.diffusemap        )     )    else    (        --print ("change " + mat.name)        standardMaterialDic.add mat.name mat.diffusemap    ))fn processRenameMultimaterial mat = (    --print ("process mul" + mat.name)    materialList = mat.materialList    for mm in materialList do    (        if classof mm == Standardmaterial then        (            processRenameStandardMaterial mm        )        else if classof mm == Multimaterial then        (            processRenameMultimaterial mm        )    ))for mat in SceneMaterials do(    if classof mat == Standardmaterial then    (        processRenameStandardMaterial mat    )    else if classof mat == Multimaterial then    (        processRenameMultimaterial mat    ))print ("转换完成!!!")closeLog()

dict字典代码来自博客

代码很简单，就是先把map同名但是贴图路径不一致名字自动修改map名字，然后Standardmaterial名字一样但是map名字不一致自动修Standardmaterial名字，不考虑Multimaterial名字一样但是里面数据不一样的情况。代码边学边写-_-。主要参考：
1. API参考：http://docs.autodesk.com/3DSMAX/16/ENU/MAXScript-Help/
2. 语法参考：<<3ds MAXScript 脚本语言>>