1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/assimp/FBXMeshGeometry.cpp	Sat Feb 01 19:58:19 2014 +0200
     1.3 @@ -0,0 +1,540 @@
     1.4 +/*
     1.5 +Open Asset Import Library (assimp)
     1.6 +----------------------------------------------------------------------
     1.7 +
     1.8 +Copyright (c) 2006-2012, assimp team
     1.9 +All rights reserved.
    1.10 +
    1.11 +Redistribution and use of this software in source and binary forms, 
    1.12 +with or without modification, are permitted provided that the 
    1.13 +following conditions are met:
    1.14 +
    1.15 +* Redistributions of source code must retain the above
    1.16 +  copyright notice, this list of conditions and the
    1.17 +  following disclaimer.
    1.18 +
    1.19 +* Redistributions in binary form must reproduce the above
    1.20 +  copyright notice, this list of conditions and the
    1.21 +  following disclaimer in the documentation and/or other
    1.22 +  materials provided with the distribution.
    1.23 +
    1.24 +* Neither the name of the assimp team, nor the names of its
    1.25 +  contributors may be used to endorse or promote products
    1.26 +  derived from this software without specific prior
    1.27 +  written permission of the assimp team.
    1.28 +
    1.29 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
    1.30 +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
    1.31 +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    1.32 +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
    1.33 +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    1.34 +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
    1.35 +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    1.36 +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
    1.37 +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
    1.38 +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
    1.39 +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    1.40 +
    1.41 +----------------------------------------------------------------------
    1.42 +*/
    1.43 +
    1.44 +/** @file  FBXMeshGeometry.cpp
    1.45 + *  @brief Assimp::FBX::MeshGeometry implementation
    1.46 + */
    1.47 +#include "AssimpPCH.h"
    1.48 +
    1.49 +#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER
    1.50 +
    1.51 +#include <functional>
    1.52 +
    1.53 +#include "FBXParser.h"
    1.54 +#include "FBXDocument.h"
    1.55 +#include "FBXImporter.h"
    1.56 +#include "FBXImportSettings.h"
    1.57 +#include "FBXDocumentUtil.h"
    1.58 +
    1.59 +
    1.60 +namespace Assimp {
    1.61 +namespace FBX {
    1.62 +
    1.63 +	using namespace Util;
    1.64 +
    1.65 +
    1.66 +// ------------------------------------------------------------------------------------------------
    1.67 +Geometry::Geometry(uint64_t id, const Element& element, const std::string& name, const Document& doc)
    1.68 +	: Object(id, element,name)
    1.69 +	, skin()
    1.70 +{
    1.71 +	const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID(),"Deformer");
    1.72 +	BOOST_FOREACH(const Connection* con, conns) {
    1.73 +		const Skin* const sk = ProcessSimpleConnection<Skin>(*con, false, "Skin -> Geometry", element);
    1.74 +		if(sk) {
    1.75 +			skin = sk;
    1.76 +			break;
    1.77 +		}
    1.78 +	}
    1.79 +}
    1.80 +
    1.81 +
    1.82 +// ------------------------------------------------------------------------------------------------
    1.83 +Geometry::~Geometry()
    1.84 +{
    1.85 +
    1.86 +}
    1.87 +
    1.88 +
    1.89 +
    1.90 +// ------------------------------------------------------------------------------------------------
    1.91 +MeshGeometry::MeshGeometry(uint64_t id, const Element& element, const std::string& name, const Document& doc)
    1.92 +: Geometry(id, element,name, doc)
    1.93 +{
    1.94 +	const Scope* sc = element.Compound();
    1.95 +	if (!sc) {
    1.96 +		DOMError("failed to read Geometry object (class: Mesh), no data scope found");
    1.97 +	}
    1.98 +
    1.99 +	// must have Mesh elements:
   1.100 +	const Element& Vertices = GetRequiredElement(*sc,"Vertices",&element);
   1.101 +	const Element& PolygonVertexIndex = GetRequiredElement(*sc,"PolygonVertexIndex",&element);
   1.102 +
   1.103 +	// optional Mesh elements:
   1.104 +	const ElementCollection& Layer = sc->GetCollection("Layer");
   1.105 +
   1.106 +	std::vector<aiVector3D> tempVerts;
   1.107 +	ParseVectorDataArray(tempVerts,Vertices);
   1.108 +
   1.109 +	if(tempVerts.empty()) {
   1.110 +		FBXImporter::LogWarn("encountered mesh with no vertices");
   1.111 +		return;
   1.112 +	}
   1.113 +
   1.114 +	std::vector<int> tempFaces;
   1.115 +	ParseVectorDataArray(tempFaces,PolygonVertexIndex);
   1.116 +
   1.117 +	if(tempFaces.empty()) {
   1.118 +		FBXImporter::LogWarn("encountered mesh with no faces");
   1.119 +		return;
   1.120 +	}
   1.121 +
   1.122 +	vertices.reserve(tempFaces.size());
   1.123 +	faces.reserve(tempFaces.size() / 3);
   1.124 +
   1.125 +	mapping_offsets.resize(tempVerts.size());
   1.126 +	mapping_counts.resize(tempVerts.size(),0);
   1.127 +	mappings.resize(tempFaces.size());
   1.128 +
   1.129 +	const size_t vertex_count = tempVerts.size();
   1.130 +
   1.131 +	// generate output vertices, computing an adjacency table to
   1.132 +	// preserve the mapping from fbx indices to *this* indexing.
   1.133 +	unsigned int count = 0;
   1.134 +	BOOST_FOREACH(int index, tempFaces) {
   1.135 +		const int absi = index < 0 ? (-index - 1) : index;
   1.136 +		if(static_cast<size_t>(absi) >= vertex_count) {
   1.137 +			DOMError("polygon vertex index out of range",&PolygonVertexIndex);
   1.138 +		}
   1.139 +
   1.140 +		vertices.push_back(tempVerts[absi]);
   1.141 +		++count;
   1.142 +
   1.143 +		++mapping_counts[absi];
   1.144 +
   1.145 +		if (index < 0) {
   1.146 +			faces.push_back(count);
   1.147 +			count = 0;
   1.148 +		}
   1.149 +	}
   1.150 +
   1.151 +	unsigned int cursor = 0;
   1.152 +	for (size_t i = 0, e = tempVerts.size(); i < e; ++i) {
   1.153 +		mapping_offsets[i] = cursor;
   1.154 +		cursor += mapping_counts[i];
   1.155 +
   1.156 +		mapping_counts[i] = 0;
   1.157 +	}
   1.158 +
   1.159 +	cursor = 0;
   1.160 +	BOOST_FOREACH(int index, tempFaces) {
   1.161 +		const int absi = index < 0 ? (-index - 1) : index;
   1.162 +		mappings[mapping_offsets[absi] + mapping_counts[absi]++] = cursor++;
   1.163 +	}
   1.164 +	
   1.165 +	// if settings.readAllLayers is true:
   1.166 +	//  * read all layers, try to load as many vertex channels as possible
   1.167 +	// if settings.readAllLayers is false:
   1.168 +	//  * read only the layer with index 0, but warn about any further layers 
   1.169 +	for (ElementMap::const_iterator it = Layer.first; it != Layer.second; ++it) {
   1.170 +		const TokenList& tokens = (*it).second->Tokens();
   1.171 +
   1.172 +		const char* err;
   1.173 +		const int index = ParseTokenAsInt(*tokens[0], err);
   1.174 +		if(err) {
   1.175 +			DOMError(err,&element);
   1.176 +		}
   1.177 +
   1.178 +		if(doc.Settings().readAllLayers || index == 0) {
   1.179 +			const Scope& layer = GetRequiredScope(*(*it).second);
   1.180 +			ReadLayer(layer);
   1.181 +		}
   1.182 +		else {
   1.183 +			FBXImporter::LogWarn("ignoring additional geometry layers");
   1.184 +		}
   1.185 +	}
   1.186 +}
   1.187 +
   1.188 +
   1.189 +// ------------------------------------------------------------------------------------------------
   1.190 +MeshGeometry::~MeshGeometry()
   1.191 +{
   1.192 +
   1.193 +}
   1.194 +
   1.195 +
   1.196 +
   1.197 +// ------------------------------------------------------------------------------------------------
   1.198 +void MeshGeometry::ReadLayer(const Scope& layer)
   1.199 +{
   1.200 +	const ElementCollection& LayerElement = layer.GetCollection("LayerElement");
   1.201 +	for (ElementMap::const_iterator eit = LayerElement.first; eit != LayerElement.second; ++eit) {
   1.202 +		const Scope& elayer = GetRequiredScope(*(*eit).second);
   1.203 +
   1.204 +		ReadLayerElement(elayer);
   1.205 +	}
   1.206 +}
   1.207 +
   1.208 +
   1.209 +// ------------------------------------------------------------------------------------------------
   1.210 +void MeshGeometry::ReadLayerElement(const Scope& layerElement)
   1.211 +{
   1.212 +	const Element& Type = GetRequiredElement(layerElement,"Type");
   1.213 +	const Element& TypedIndex = GetRequiredElement(layerElement,"TypedIndex");
   1.214 +
   1.215 +	const std::string& type = ParseTokenAsString(GetRequiredToken(Type,0));
   1.216 +	const int typedIndex = ParseTokenAsInt(GetRequiredToken(TypedIndex,0));
   1.217 +
   1.218 +	const Scope& top = GetRequiredScope(element);
   1.219 +	const ElementCollection candidates = top.GetCollection(type);
   1.220 +
   1.221 +	for (ElementMap::const_iterator it = candidates.first; it != candidates.second; ++it) {
   1.222 +		const int index = ParseTokenAsInt(GetRequiredToken(*(*it).second,0));
   1.223 +		if(index == typedIndex) {
   1.224 +			ReadVertexData(type,typedIndex,GetRequiredScope(*(*it).second));
   1.225 +			return;
   1.226 +		}
   1.227 +	}
   1.228 +
   1.229 +	FBXImporter::LogError(Formatter::format("failed to resolve vertex layer element: ") 
   1.230 +		<< type << ", index: " << typedIndex);
   1.231 +}
   1.232 +
   1.233 +
   1.234 +// ------------------------------------------------------------------------------------------------
   1.235 +void MeshGeometry::ReadVertexData(const std::string& type, int index, const Scope& source)
   1.236 +{
   1.237 +	const std::string& MappingInformationType = ParseTokenAsString(GetRequiredToken(
   1.238 +		GetRequiredElement(source,"MappingInformationType"),0)
   1.239 +	);
   1.240 +
   1.241 +	const std::string& ReferenceInformationType = ParseTokenAsString(GetRequiredToken(
   1.242 +		GetRequiredElement(source,"ReferenceInformationType"),0)
   1.243 +	);
   1.244 +	
   1.245 +	if (type == "LayerElementUV") {
   1.246 +		if(index >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
   1.247 +			FBXImporter::LogError(Formatter::format("ignoring UV layer, maximum number of UV channels exceeded: ") 
   1.248 +				<< index << " (limit is " << AI_MAX_NUMBER_OF_TEXTURECOORDS << ")" );
   1.249 +			return;
   1.250 +		}
   1.251 +
   1.252 +		const Element* Name = source["Name"];
   1.253 +		uvNames[index] = "";
   1.254 +		if(Name) {
   1.255 +			uvNames[index] = ParseTokenAsString(GetRequiredToken(*Name,0));
   1.256 +		}
   1.257 +
   1.258 +		ReadVertexDataUV(uvs[index],source,
   1.259 +			MappingInformationType,
   1.260 +			ReferenceInformationType
   1.261 +		);
   1.262 +	}
   1.263 +	else if (type == "LayerElementMaterial") {
   1.264 +		if (materials.size() > 0) {
   1.265 +			FBXImporter::LogError("ignoring additional material layer");
   1.266 +			return;
   1.267 +		}
   1.268 +
   1.269 +		std::vector<int> temp_materials;
   1.270 +
   1.271 +		ReadVertexDataMaterials(temp_materials,source,
   1.272 +			MappingInformationType,
   1.273 +			ReferenceInformationType
   1.274 +		);
   1.275 +
   1.276 +		// sometimes, there will be only negative entries. Drop the material
   1.277 +		// layer in such a case (I guess it means a default material should
   1.278 +		// be used). This is what the converter would do anyway, and it
   1.279 +		// avoids loosing the material if there are more material layers
   1.280 +		// coming of which at least one contains actual data (did observe
   1.281 +		// that with one test file).
   1.282 +		const size_t count_neg = std::count_if(temp_materials.begin(),temp_materials.end(),std::bind2nd(std::less<int>(),0));
   1.283 +		if(count_neg == temp_materials.size()) {
   1.284 +			FBXImporter::LogWarn("ignoring dummy material layer (all entries -1)");
   1.285 +			return;
   1.286 +		}
   1.287 +
   1.288 +		std::swap(temp_materials, materials);
   1.289 +	}
   1.290 +	else if (type == "LayerElementNormal") {
   1.291 +		if (normals.size() > 0) {
   1.292 +			FBXImporter::LogError("ignoring additional normal layer");
   1.293 +			return;
   1.294 +		}
   1.295 +
   1.296 +		ReadVertexDataNormals(normals,source,
   1.297 +			MappingInformationType,
   1.298 +			ReferenceInformationType
   1.299 +		);
   1.300 +	}
   1.301 +	else if (type == "LayerElementTangent") {
   1.302 +		if (tangents.size() > 0) {
   1.303 +			FBXImporter::LogError("ignoring additional tangent layer");
   1.304 +			return;
   1.305 +		}
   1.306 +
   1.307 +		ReadVertexDataTangents(tangents,source,
   1.308 +			MappingInformationType,
   1.309 +			ReferenceInformationType
   1.310 +		);
   1.311 +	}
   1.312 +	else if (type == "LayerElementBinormal") {
   1.313 +		if (binormals.size() > 0) {
   1.314 +			FBXImporter::LogError("ignoring additional binormal layer");
   1.315 +			return;
   1.316 +		}
   1.317 +
   1.318 +		ReadVertexDataBinormals(binormals,source,
   1.319 +			MappingInformationType,
   1.320 +			ReferenceInformationType
   1.321 +		);
   1.322 +	}
   1.323 +	else if (type == "LayerElementColor") {
   1.324 +		if(index >= AI_MAX_NUMBER_OF_COLOR_SETS) {
   1.325 +			FBXImporter::LogError(Formatter::format("ignoring vertex color layer, maximum number of color sets exceeded: ") 
   1.326 +				<< index << " (limit is " << AI_MAX_NUMBER_OF_COLOR_SETS << ")" );
   1.327 +			return;
   1.328 +		}
   1.329 +
   1.330 +		ReadVertexDataColors(colors[index],source,
   1.331 +			MappingInformationType,
   1.332 +			ReferenceInformationType
   1.333 +		);
   1.334 +	}
   1.335 +}
   1.336 +
   1.337 +
   1.338 +// ------------------------------------------------------------------------------------------------
   1.339 +// Lengthy utility function to read and resolve a FBX vertex data array - that is, the
   1.340 +// output is in polygon vertex order. This logic is used for reading normals, UVs, colors,
   1.341 +// tangents ..
   1.342 +template <typename T>
   1.343 +void ResolveVertexDataArray(std::vector<T>& data_out, const Scope& source, 
   1.344 +	const std::string& MappingInformationType,
   1.345 +	const std::string& ReferenceInformationType,
   1.346 +	const char* dataElementName,
   1.347 +	const char* indexDataElementName,
   1.348 +	size_t vertex_count,
   1.349 +	const std::vector<unsigned int>& mapping_counts,
   1.350 +	const std::vector<unsigned int>& mapping_offsets,
   1.351 +	const std::vector<unsigned int>& mappings)
   1.352 +{
   1.353 +	std::vector<T> tempUV;
   1.354 +	ParseVectorDataArray(tempUV,GetRequiredElement(source,dataElementName));
   1.355 +
   1.356 +	// handle permutations of Mapping and Reference type - it would be nice to
   1.357 +	// deal with this more elegantly and with less redundancy, but right
   1.358 +	// now it seems unavoidable.
   1.359 +	if (MappingInformationType == "ByVertice" && ReferenceInformationType == "Direct") {	
   1.360 +		data_out.resize(vertex_count);
   1.361 +		for (size_t i = 0, e = tempUV.size(); i < e; ++i) {
   1.362 +
   1.363 +			const unsigned int istart = mapping_offsets[i], iend = istart + mapping_counts[i];
   1.364 +			for (unsigned int j = istart; j < iend; ++j) {
   1.365 +				data_out[mappings[j]] = tempUV[i];
   1.366 +			}
   1.367 +		}
   1.368 +	}
   1.369 +	else if (MappingInformationType == "ByVertice" && ReferenceInformationType == "IndexToDirect") {	
   1.370 +		data_out.resize(vertex_count);
   1.371 +
   1.372 +		std::vector<int> uvIndices;
   1.373 +		ParseVectorDataArray(uvIndices,GetRequiredElement(source,indexDataElementName));
   1.374 +
   1.375 +		for (size_t i = 0, e = uvIndices.size(); i < e; ++i) {
   1.376 +
   1.377 +			const unsigned int istart = mapping_offsets[i], iend = istart + mapping_counts[i];
   1.378 +			for (unsigned int j = istart; j < iend; ++j) {
   1.379 +				if(static_cast<size_t>(uvIndices[i]) >= tempUV.size()) {
   1.380 +					DOMError("index out of range",&GetRequiredElement(source,indexDataElementName));
   1.381 +				}
   1.382 +				data_out[mappings[j]] = tempUV[uvIndices[i]];
   1.383 +			}
   1.384 +		}
   1.385 +	}
   1.386 +	else if (MappingInformationType == "ByPolygonVertex" && ReferenceInformationType == "Direct") {	
   1.387 +		if (tempUV.size() != vertex_count) {
   1.388 +			FBXImporter::LogError(Formatter::format("length of input data unexpected for ByPolygon mapping: ") 
   1.389 +				<< tempUV.size() << ", expected " << vertex_count
   1.390 +			);
   1.391 +			return;
   1.392 +		}
   1.393 +
   1.394 +		data_out.swap(tempUV);
   1.395 +	}
   1.396 +	else if (MappingInformationType == "ByPolygonVertex" && ReferenceInformationType == "IndexToDirect") {	
   1.397 +		data_out.resize(vertex_count);
   1.398 +
   1.399 +		std::vector<int> uvIndices;
   1.400 +		ParseVectorDataArray(uvIndices,GetRequiredElement(source,indexDataElementName));
   1.401 +
   1.402 +		if (uvIndices.size() != vertex_count) {
   1.403 +			FBXImporter::LogError("length of input data unexpected for ByPolygonVertex mapping");
   1.404 +			return;
   1.405 +		}
   1.406 +
   1.407 +		unsigned int next = 0;
   1.408 +		BOOST_FOREACH(int i, uvIndices) {
   1.409 +			if(static_cast<size_t>(i) >= tempUV.size()) {
   1.410 +				DOMError("index out of range",&GetRequiredElement(source,indexDataElementName));
   1.411 +			}
   1.412 +
   1.413 +			data_out[next++] = tempUV[i];
   1.414 +		}
   1.415 +	}
   1.416 +	else {
   1.417 +		FBXImporter::LogError(Formatter::format("ignoring vertex data channel, access type not implemented: ") 
   1.418 +			<< MappingInformationType << "," << ReferenceInformationType);
   1.419 +	}
   1.420 +}
   1.421 +
   1.422 +// ------------------------------------------------------------------------------------------------
   1.423 +void MeshGeometry::ReadVertexDataNormals(std::vector<aiVector3D>& normals_out, const Scope& source, 
   1.424 +	const std::string& MappingInformationType,
   1.425 +	const std::string& ReferenceInformationType)
   1.426 +{
   1.427 +	ResolveVertexDataArray(normals_out,source,MappingInformationType,ReferenceInformationType,
   1.428 +		"Normals",
   1.429 +		"NormalsIndex",
   1.430 +		vertices.size(),
   1.431 +		mapping_counts,
   1.432 +		mapping_offsets,
   1.433 +		mappings);
   1.434 +}
   1.435 +
   1.436 +
   1.437 +// ------------------------------------------------------------------------------------------------
   1.438 +void MeshGeometry::ReadVertexDataUV(std::vector<aiVector2D>& uv_out, const Scope& source, 
   1.439 +	const std::string& MappingInformationType,
   1.440 +	const std::string& ReferenceInformationType)
   1.441 +{
   1.442 +	ResolveVertexDataArray(uv_out,source,MappingInformationType,ReferenceInformationType,
   1.443 +		"UV",
   1.444 +		"UVIndex",
   1.445 +		vertices.size(),
   1.446 +		mapping_counts,
   1.447 +		mapping_offsets,
   1.448 +		mappings);
   1.449 +}
   1.450 +
   1.451 +
   1.452 +// ------------------------------------------------------------------------------------------------
   1.453 +void MeshGeometry::ReadVertexDataColors(std::vector<aiColor4D>& colors_out, const Scope& source, 
   1.454 +	const std::string& MappingInformationType,
   1.455 +	const std::string& ReferenceInformationType)
   1.456 +{
   1.457 +	ResolveVertexDataArray(colors_out,source,MappingInformationType,ReferenceInformationType,
   1.458 +		"Colors",
   1.459 +		"ColorIndex",
   1.460 +		vertices.size(),
   1.461 +		mapping_counts,
   1.462 +		mapping_offsets,
   1.463 +		mappings);
   1.464 +}
   1.465 +
   1.466 +
   1.467 +// ------------------------------------------------------------------------------------------------
   1.468 +void MeshGeometry::ReadVertexDataTangents(std::vector<aiVector3D>& tangents_out, const Scope& source, 
   1.469 +	const std::string& MappingInformationType,
   1.470 +	const std::string& ReferenceInformationType)
   1.471 +{
   1.472 +	ResolveVertexDataArray(tangents_out,source,MappingInformationType,ReferenceInformationType,
   1.473 +		"Tangent",
   1.474 +		"TangentIndex",
   1.475 +		vertices.size(),
   1.476 +		mapping_counts,
   1.477 +		mapping_offsets,
   1.478 +		mappings);
   1.479 +}
   1.480 +
   1.481 +
   1.482 +// ------------------------------------------------------------------------------------------------
   1.483 +void MeshGeometry::ReadVertexDataBinormals(std::vector<aiVector3D>& binormals_out, const Scope& source, 
   1.484 +	const std::string& MappingInformationType,
   1.485 +	const std::string& ReferenceInformationType)
   1.486 +{
   1.487 +	ResolveVertexDataArray(binormals_out,source,MappingInformationType,ReferenceInformationType,
   1.488 +		"Binormal",
   1.489 +		"BinormalIndex",
   1.490 +		vertices.size(),
   1.491 +		mapping_counts,
   1.492 +		mapping_offsets,
   1.493 +		mappings);
   1.494 +}
   1.495 +
   1.496 +
   1.497 +// ------------------------------------------------------------------------------------------------
   1.498 +void MeshGeometry::ReadVertexDataMaterials(std::vector<int>& materials_out, const Scope& source, 
   1.499 +	const std::string& MappingInformationType,
   1.500 +	const std::string& ReferenceInformationType)
   1.501 +{
   1.502 +	const size_t face_count = faces.size();
   1.503 +	ai_assert(face_count);
   1.504 +
   1.505 +	// materials are handled separately. First of all, they are assigned per-face
   1.506 +	// and not per polyvert. Secondly, ReferenceInformationType=IndexToDirect
   1.507 +	// has a slightly different meaning for materials.
   1.508 +	ParseVectorDataArray(materials_out,GetRequiredElement(source,"Materials"));
   1.509 +
   1.510 +	if (MappingInformationType == "AllSame") {
   1.511 +		// easy - same material for all faces
   1.512 +		if (materials_out.empty()) {
   1.513 +			FBXImporter::LogError(Formatter::format("expected material index, ignoring"));
   1.514 +			return;
   1.515 +		}
   1.516 +		else if (materials_out.size() > 1) {
   1.517 +			FBXImporter::LogWarn(Formatter::format("expected only a single material index, ignoring all except the first one"));
   1.518 +			materials_out.clear();
   1.519 +		}
   1.520 + 
   1.521 +		materials.assign(vertices.size(),materials_out[0]);
   1.522 +	}
   1.523 +	else if (MappingInformationType == "ByPolygon" && ReferenceInformationType == "IndexToDirect") {
   1.524 +		materials.resize(face_count);
   1.525 +
   1.526 +		if(materials_out.size() != face_count) {
   1.527 +			FBXImporter::LogError(Formatter::format("length of input data unexpected for ByPolygon mapping: ") 
   1.528 +				<< materials_out.size() << ", expected " << face_count
   1.529 +			);
   1.530 +			return;
   1.531 +		}
   1.532 +	}
   1.533 +	else {
   1.534 +		FBXImporter::LogError(Formatter::format("ignoring material assignments, access type not implemented: ") 
   1.535 +			<< MappingInformationType << "," << ReferenceInformationType);
   1.536 +	}
   1.537 +}
   1.538 +
   1.539 +} // !FBX
   1.540 +} // !Assimp
   1.541 +
   1.542 +#endif
   1.543 +