Fixed many FBX bugs

Fixed a bug where FBX loader won´t load embedded textures that don´t have the Content data filled. Some FBX files only fill this data once, so any embedded texture with the same source filename, should use the pre-loaded data.

Fixed another bug where FBX Texture "Filename" field came different than  on some files than the one defined by the code. One suggestion is load all properties by the case-insensitive function created.

Added the "AI_CONFIG_IMPORT_FBX_SEARCH_EMBEDDED_TEXTURES" flag to tell the importer to load embedded texture data from already loaded ones.

code/FBXConverter.cpp

@@ -436,6 +436,19 @@ private:
 
     aiScene* const out;
     const FBX::Document& doc;
+
+	bool FindTextureIndexByFilename(const Video& video, unsigned int& index) {
+		index = 0;
+		const char* videoFileName = video.FileName().c_str();
+		for (auto texture = textures_converted.begin(); texture != textures_converted.end(); ++texture)
+		{
+			if (!strcmp(texture->first->FileName().c_str(), videoFileName)) {
+				return true;
+			}
+			index++;
+		}
+		return false;
+	}
 };
 
 Converter::Converter( aiScene* out, const Document& doc )
@@ -1783,22 +1796,32 @@ void Converter::TrySetTextureProperties( aiMaterial* out_mat, const TextureMap&
         path.Set( tex->RelativeFilename() );
 
         const Video* media = tex->Media();
-        if ( media != 0 && media->ContentLength() > 0 ) {
+        if (media != 0) {
+			bool textureReady = false; //tells if our texture is ready (if it was loaded or if it was found)
 			unsigned int index;
 
 			VideoMap::const_iterator it = textures_converted.find(media);
 			if (it != textures_converted.end()) {
 				index = (*it).second;
+				textureReady = true;
 			}
 			else {
+				if (media->ContentLength() > 0) {
 					index = ConvertVideo(*media);
 					textures_converted[media] = index;
+					textureReady = true;
+				}
+				else if (doc.Settings().searchEmbeddedTextures) { //try to find the texture on the already-loaded textures by the filename, if the flag is on					
+					textureReady = FindTextureIndexByFilename(*media, index);
+				}
 			}
 
-            // setup texture reference string (copied from ColladaLoader::FindFilenameForEffectTexture)
+			// setup texture reference string (copied from ColladaLoader::FindFilenameForEffectTexture), if the texture is ready
+			if (textureReady) {
 				path.data[0] = '*';
 				path.length = 1 + ASSIMP_itoa10(path.data + 1, MAXLEN - 1, index);
 			}
+		}  
 
         out_mat->AddProperty( &path, _AI_MATKEY_TEXTURE_BASE, target, 0 );
 

code/FBXImportSettings.h

@@ -63,6 +63,7 @@ struct ImportSettings
         , readWeights(true)
         , preservePivots(true)
         , optimizeEmptyAnimationCurves(true)
+		, searchEmbeddedTextures(false)
     {}
 
 
@@ -137,6 +138,10 @@ struct ImportSettings
      *  values matching the corresponding node transformation.
      *  The default value is true. */
     bool optimizeEmptyAnimationCurves;
+
+	/** search for embedded loaded textures, where no embedded texture data is provided.
+	*  The default value is false. */
+	bool searchEmbeddedTextures;
 };
 
 

code/FBXImporter.cpp

@@ -131,6 +131,7 @@ void FBXImporter::SetupProperties(const Importer* pImp)
     settings.strictMode = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_STRICT_MODE, false);
     settings.preservePivots = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_PRESERVE_PIVOTS, true);
     settings.optimizeEmptyAnimationCurves = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES, true);
+	settings.searchEmbeddedTextures = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_SEARCH_EMBEDDED_TEXTURES, false);
 }
 
 // ------------------------------------------------------------------------------------------------

code/FBXMaterial.cpp

@@ -281,7 +281,7 @@ Video::Video(uint64_t id, const Element& element, const Document& doc, const std
     const Scope& sc = GetRequiredScope(element);
 
     const Element* const Type = sc["Type"];
-    const Element* const FileName = sc["FileName"];
+    const Element* const FileName = sc.FindElementCaseInsensitive("FileName");  //some files retain the information as "Filename", others "FileName", who knows
     const Element* const RelativeFilename = sc["RelativeFilename"];
     const Element* const Content = sc["Content"];
 
@@ -298,6 +298,8 @@ Video::Video(uint64_t id, const Element& element, const Document& doc, const std
     }
 
     if(Content) {
+		//this field is ommited when the embedded texture is already loaded, let's ignore if it´s not found
+		try {
 			const Token& token = GetRequiredToken(*Content, 0);
 			const char* data = token.begin();
 			if (!token.IsBinary()) {
@@ -320,6 +322,9 @@ Video::Video(uint64_t id, const Element& element, const Document& doc, const std
 				content = new uint8_t[len];
 				::memcpy(content, data + 5, len);
 			}
+		} catch (runtime_error runtimeError) {
+			//we don´t need the content data for contents that has already been loaded
+		}
     }
 
     props = GetPropertyTable(doc,"Video.FbxVideo",element,sc);

code/FBXParser.h

@@ -49,6 +49,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <map>
 #include <memory>
 #include "LogAux.h"
+#include "fast_atof.h"
 
 #include "FBXCompileConfig.h"
 #include "FBXTokenizer.h"
@@ -137,6 +138,17 @@ public:
         return it == elements.end() ? NULL : (*it).second;
     }
 
+	const Element* FindElementCaseInsensitive(const std::string& elementName) const {
+		const char* elementNameCStr = elementName.c_str();
+		for (auto element = elements.begin(); element != elements.end(); ++element)
+		{
+			if (!ASSIMP_strincmp(element->first.c_str(), elementNameCStr, MAXLEN)) {
+				return element->second;
+			}
+		}
+		return NULL;
+	}
+
     ElementCollection GetCollection(const std::string& index) const {
         return elements.equal_range(index);
     }

include/assimp/config.h.in

@@ -3,7 +3,7 @@
 Open Asset Import Library (assimp)
 ---------------------------------------------------------------------------
 
-Copyright (c) 2006-2016, assimp team
+Copyright (c) 2006-2017, assimp team
 
 All rights reserved.
 
@@ -632,7 +632,14 @@ enum aiComponent
 #define AI_CONFIG_IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES \
     "IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES"
 
-
+// ---------------------------------------------------------------------------
+/** @brief Set whether the fbx importer will search for embedded loaded textures, where no embedded texture data is provided.
+*
+* The default value is false (0)
+* Property type: bool
+*/
+#define AI_CONFIG_IMPORT_FBX_SEARCH_EMBEDDED_TEXTURES \
+	"IMPORT_FBX_SEARCH_EMBEDDED_TEXTURES"
 	
 // ---------------------------------------------------------------------------
 /** @brief  Set the vertex animation keyframe to be imported