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• 3DSMax導出的材質mtl文件漫反射貼圖路徑不正確

之前流程是寫了一個3DSMAX插件把游戲的場景直接導出為自己定義的格式的文件，包含了頂點數據，三角形數據，貼圖數據等。現在把插件從3DMAX上分離出來，先通過3DMAX導出OBJ，然后再把OBJ導出為自定義的格式。

3DSMax導出的材質mtl文件漫反射貼圖路徑不正確

一開始以為是一個Standardmaterial對應漫反射的Map名字一樣但是貼圖路徑不一樣導致了OBJ導出出錯。寫了一個把同一個Map但是對應不同的貼圖路徑的Map自動重命名的MaxScript腳本，導出發現結果是一樣的。
一個Multimaterial下的Standardmaterial和一個Standardmaterial名字一樣，但是這二個Standardmaterial的diffusemap的文件路徑不一樣。從而導致了OBJ導出出錯。

自動轉換的代碼如下：

--My Dictionary struct 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 key1append values value1true)else(print ("key has already been added! -->" + key1)false)),fn Clear = (keys = #()values = #()true),fn Remove key = (index = findItem keys keyif index != 0 then(deleteItem keys indexdeleteItem values indextrue)else(print ("cann't find the key! -->" + key)false)),fn GetItem key = (index = findItem keys keyif 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 keyif 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:true texturePathToMapNameDict = dict() mapCount = 1000fn processStandardMaterial mat = (if (mat.diffusemap != undefined) then(diffmap = mat.diffusemapmapname = diffmap.nameif (diffmap.fileName != undefined) then(filepath = diffmap.fileName as stringif (texturePathToMapNameDict.ContainsKey filepath) then(dm = texturePathToMapNameDict.getItem filepath--print ("change " + mat.diffusemap.name + " to " + (texturePathToMapNameDict.getItem filepath).name)mat.diffusemap = copy dmupdateMTLInMedit mat.diffusemap)else(newMapName = "Map_#" + (mapCount as string)mapCount = mapCount + 1newDiffuse = mat.diffusemapnewDiffuse.name = newMapName--newDiffuse.reload()mat.diffusemap = copy newDiffusetexturePathToMapNameDict.add filepath newDiffuse ))) )fn processMultimaterial mat = (materialList = mat.materialListfor mm in materialList do(if classof mm == Standardmaterial then(processStandardMaterial mm)else if classof mm == Multimaterial then(processMultimaterial mm)) ) --meditMaterials --SceneMaterials for 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.nameif ((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 + 1standardMaterialDic.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.materialListfor 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 ("轉換完成!!!") closeLog()

dict字典代碼來自博客

代碼很簡單，就是先把map同名但是貼圖路徑不一致名字自動修改map名字，然后Standardmaterial名字一樣但是map名字不一致自動修Standardmaterial名字，不考慮Multimaterial名字一樣但是里面數據不一樣的情況。代碼邊學邊寫-_-。主要參考：

API參考：http://docs.autodesk.com/3DSMAX/16/ENU/MAXScript-Help/

語法參考：<<3ds MAXScript 腳本語言>>

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