Look for filenames using alternative slash characters

src/fbx/Fbx2Raw.cpp

@@ -32,6 +32,14 @@
 #include "materials/RoughnessMetallicMaterials.hpp"
 #include "materials/TraditionalMaterials.hpp"
 
+#ifdef _WIN32
+#define SLASH_CHAR '\\'
+#define ALTERNATIVE_SLASH_CHAR '/'
+#else
+#define SLASH_CHAR '/'
+#define ALTERNATIVE_SLASH_CHAR '\\'
+#endif
+
 float scaleFactor;
 
 static std::string NativeToUTF8(const std::string& str) {
@@ -998,6 +1006,21 @@ static std::string FindFbxTexture(
       return FileUtils::GetAbsolutePath(fileLocation);
     }
   }
+  // Replace slashes with alternative platform version (e.g. '/' instead of '\\')
+  std::string textureFileNameAltSlash = textureFileName;
+  std::replace(
+      textureFileNameAltSlash.begin(),
+      textureFileNameAltSlash.end(),
+      ALTERNATIVE_SLASH_CHAR,
+      SLASH_CHAR);
+  // finally look with alternative slashes
+  for (int ii = 0; ii < folders.size(); ii++) {
+    const auto& fileLocation =
+        FindFileLoosely(textureFileNameAltSlash, folders[ii], folderContents[ii]);
+    if (!fileLocation.empty()) {
+      return FileUtils::GetAbsolutePath(fileLocation);
+    }
+  }
   return "";
 }