assimp/code/AssetLib/FBX/FBXMeshGeometry.cpp

729 lines
27 KiB
C++

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------
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*/
/** @file FBXMeshGeometry.cpp
* @brief Assimp::FBX::MeshGeometry implementation
*/
#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER
#include <functional>
#include "FBXMeshGeometry.h"
#include "FBXDocument.h"
#include "FBXImporter.h"
#include "FBXImportSettings.h"
#include "FBXDocumentUtil.h"
namespace Assimp {
namespace FBX {
using namespace Util;
// ------------------------------------------------------------------------------------------------
Geometry::Geometry(uint64_t id, const Element& element, const std::string& name, const Document& doc)
: Object(id, element, name)
, skin()
{
const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID(),"Deformer");
for(const Connection* con : conns) {
const Skin* const sk = ProcessSimpleConnection<Skin>(*con, false, "Skin -> Geometry", element);
if(sk) {
skin = sk;
}
const BlendShape* const bsp = ProcessSimpleConnection<BlendShape>(*con, false, "BlendShape -> Geometry", element);
if (bsp) {
blendShapes.push_back(bsp);
}
}
}
// ------------------------------------------------------------------------------------------------
Geometry::~Geometry()
{
// empty
}
// ------------------------------------------------------------------------------------------------
const std::vector<const BlendShape*>& Geometry::GetBlendShapes() const {
return blendShapes;
}
// ------------------------------------------------------------------------------------------------
const Skin* Geometry::DeformerSkin() const {
return skin;
}
// ------------------------------------------------------------------------------------------------
MeshGeometry::MeshGeometry(uint64_t id, const Element& element, const std::string& name, const Document& doc)
: Geometry(id, element,name, doc)
{
const Scope* sc = element.Compound();
if (!sc) {
DOMError("failed to read Geometry object (class: Mesh), no data scope found");
}
// must have Mesh elements:
const Element& Vertices = GetRequiredElement(*sc,"Vertices",&element);
const Element& PolygonVertexIndex = GetRequiredElement(*sc,"PolygonVertexIndex",&element);
// optional Mesh elements:
const ElementCollection& Layer = sc->GetCollection("Layer");
std::vector<aiVector3D> tempVerts;
ParseVectorDataArray(tempVerts,Vertices);
if(tempVerts.empty()) {
FBXImporter::LogWarn("encountered mesh with no vertices");
}
std::vector<int> tempFaces;
ParseVectorDataArray(tempFaces,PolygonVertexIndex);
if(tempFaces.empty()) {
FBXImporter::LogWarn("encountered mesh with no faces");
}
m_vertices.reserve(tempFaces.size());
m_faces.reserve(tempFaces.size() / 3);
m_mapping_offsets.resize(tempVerts.size());
m_mapping_counts.resize(tempVerts.size(),0);
m_mappings.resize(tempFaces.size());
const size_t vertex_count = tempVerts.size();
// generate output vertices, computing an adjacency table to
// preserve the mapping from fbx indices to *this* indexing.
unsigned int count = 0;
for(int index : tempFaces) {
const int absi = index < 0 ? (-index - 1) : index;
if(static_cast<size_t>(absi) >= vertex_count) {
DOMError("polygon vertex index out of range",&PolygonVertexIndex);
}
m_vertices.push_back(tempVerts[absi]);
++count;
++m_mapping_counts[absi];
if (index < 0) {
m_faces.push_back(count);
count = 0;
}
}
unsigned int cursor = 0;
for (size_t i = 0, e = tempVerts.size(); i < e; ++i) {
m_mapping_offsets[i] = cursor;
cursor += m_mapping_counts[i];
m_mapping_counts[i] = 0;
}
cursor = 0;
for(int index : tempFaces) {
const int absi = index < 0 ? (-index - 1) : index;
m_mappings[m_mapping_offsets[absi] + m_mapping_counts[absi]++] = cursor++;
}
// if settings.readAllLayers is true:
// * read all layers, try to load as many vertex channels as possible
// if settings.readAllLayers is false:
// * read only the layer with index 0, but warn about any further layers
for (ElementMap::const_iterator it = Layer.first; it != Layer.second; ++it) {
const TokenList& tokens = (*it).second->Tokens();
const char* err;
const int index = ParseTokenAsInt(*tokens[0], err);
if(err) {
DOMError(err,&element);
}
if(doc.Settings().readAllLayers || index == 0) {
const Scope& layer = GetRequiredScope(*(*it).second);
ReadLayer(layer);
}
else {
FBXImporter::LogWarn("ignoring additional geometry layers");
}
}
}
// ------------------------------------------------------------------------------------------------
MeshGeometry::~MeshGeometry() {
// empty
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& MeshGeometry::GetVertices() const {
return m_vertices;
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& MeshGeometry::GetNormals() const {
return m_normals;
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& MeshGeometry::GetTangents() const {
return m_tangents;
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& MeshGeometry::GetBinormals() const {
return m_binormals;
}
// ------------------------------------------------------------------------------------------------
const std::vector<unsigned int>& MeshGeometry::GetFaceIndexCounts() const {
return m_faces;
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector2D>& MeshGeometry::GetTextureCoords( unsigned int index ) const {
static const std::vector<aiVector2D> empty;
return index >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? empty : m_uvs[ index ];
}
std::string MeshGeometry::GetTextureCoordChannelName( unsigned int index ) const {
return index >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? "" : m_uvNames[ index ];
}
const std::vector<aiColor4D>& MeshGeometry::GetVertexColors( unsigned int index ) const {
static const std::vector<aiColor4D> empty;
return index >= AI_MAX_NUMBER_OF_COLOR_SETS ? empty : m_colors[ index ];
}
const MatIndexArray& MeshGeometry::GetMaterialIndices() const {
return m_materials;
}
// ------------------------------------------------------------------------------------------------
const unsigned int* MeshGeometry::ToOutputVertexIndex( unsigned int in_index, unsigned int& count ) const {
if ( in_index >= m_mapping_counts.size() ) {
return nullptr;
}
ai_assert( m_mapping_counts.size() == m_mapping_offsets.size() );
count = m_mapping_counts[ in_index ];
ai_assert( m_mapping_offsets[ in_index ] + count <= m_mappings.size() );
return &m_mappings[ m_mapping_offsets[ in_index ] ];
}
// ------------------------------------------------------------------------------------------------
unsigned int MeshGeometry::FaceForVertexIndex( unsigned int in_index ) const {
ai_assert( in_index < m_vertices.size() );
// in the current conversion pattern this will only be needed if
// weights are present, so no need to always pre-compute this table
if ( m_facesVertexStartIndices.empty() ) {
m_facesVertexStartIndices.resize( m_faces.size() + 1, 0 );
std::partial_sum( m_faces.begin(), m_faces.end(), m_facesVertexStartIndices.begin() + 1 );
m_facesVertexStartIndices.pop_back();
}
ai_assert( m_facesVertexStartIndices.size() == m_faces.size() );
const std::vector<unsigned int>::iterator it = std::upper_bound(
m_facesVertexStartIndices.begin(),
m_facesVertexStartIndices.end(),
in_index
);
return static_cast< unsigned int >( std::distance( m_facesVertexStartIndices.begin(), it - 1 ) );
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadLayer(const Scope& layer)
{
const ElementCollection& LayerElement = layer.GetCollection("LayerElement");
for (ElementMap::const_iterator eit = LayerElement.first; eit != LayerElement.second; ++eit) {
const Scope& elayer = GetRequiredScope(*(*eit).second);
ReadLayerElement(elayer);
}
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadLayerElement(const Scope& layerElement)
{
const Element& Type = GetRequiredElement(layerElement,"Type");
const Element& TypedIndex = GetRequiredElement(layerElement,"TypedIndex");
const std::string& type = ParseTokenAsString(GetRequiredToken(Type,0));
const int typedIndex = ParseTokenAsInt(GetRequiredToken(TypedIndex,0));
const Scope& top = GetRequiredScope(element);
const ElementCollection candidates = top.GetCollection(type);
for (ElementMap::const_iterator it = candidates.first; it != candidates.second; ++it) {
const int index = ParseTokenAsInt(GetRequiredToken(*(*it).second,0));
if(index == typedIndex) {
ReadVertexData(type,typedIndex,GetRequiredScope(*(*it).second));
return;
}
}
FBXImporter::LogError("failed to resolve vertex layer element: ",
type, ", index: ", typedIndex);
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadVertexData(const std::string& type, int index, const Scope& source)
{
const std::string& MappingInformationType = ParseTokenAsString(GetRequiredToken(
GetRequiredElement(source,"MappingInformationType"),0)
);
const std::string& ReferenceInformationType = ParseTokenAsString(GetRequiredToken(
GetRequiredElement(source,"ReferenceInformationType"),0)
);
if (type == "LayerElementUV") {
if(index >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
FBXImporter::LogError("ignoring UV layer, maximum number of UV channels exceeded: ",
index, " (limit is ", AI_MAX_NUMBER_OF_TEXTURECOORDS, ")" );
return;
}
const Element* Name = source["Name"];
m_uvNames[index] = std::string();
if(Name) {
m_uvNames[index] = ParseTokenAsString(GetRequiredToken(*Name,0));
}
ReadVertexDataUV(m_uvs[index],source,
MappingInformationType,
ReferenceInformationType
);
}
else if (type == "LayerElementMaterial") {
if (m_materials.size() > 0) {
FBXImporter::LogError("ignoring additional material layer");
return;
}
std::vector<int> temp_materials;
ReadVertexDataMaterials(temp_materials,source,
MappingInformationType,
ReferenceInformationType
);
// sometimes, there will be only negative entries. Drop the material
// layer in such a case (I guess it means a default material should
// be used). This is what the converter would do anyway, and it
// avoids losing the material if there are more material layers
// coming of which at least one contains actual data (did observe
// that with one test file).
const size_t count_neg = std::count_if(temp_materials.begin(),temp_materials.end(),[](int n) { return n < 0; });
if(count_neg == temp_materials.size()) {
FBXImporter::LogWarn("ignoring dummy material layer (all entries -1)");
return;
}
std::swap(temp_materials, m_materials);
}
else if (type == "LayerElementNormal") {
if (m_normals.size() > 0) {
FBXImporter::LogError("ignoring additional normal layer");
return;
}
ReadVertexDataNormals(m_normals,source,
MappingInformationType,
ReferenceInformationType
);
}
else if (type == "LayerElementTangent") {
if (m_tangents.size() > 0) {
FBXImporter::LogError("ignoring additional tangent layer");
return;
}
ReadVertexDataTangents(m_tangents,source,
MappingInformationType,
ReferenceInformationType
);
}
else if (type == "LayerElementBinormal") {
if (m_binormals.size() > 0) {
FBXImporter::LogError("ignoring additional binormal layer");
return;
}
ReadVertexDataBinormals(m_binormals,source,
MappingInformationType,
ReferenceInformationType
);
}
else if (type == "LayerElementColor") {
if(index >= AI_MAX_NUMBER_OF_COLOR_SETS) {
FBXImporter::LogError("ignoring vertex color layer, maximum number of color sets exceeded: ",
index, " (limit is ", AI_MAX_NUMBER_OF_COLOR_SETS, ")" );
return;
}
ReadVertexDataColors(m_colors[index],source,
MappingInformationType,
ReferenceInformationType
);
}
}
// ------------------------------------------------------------------------------------------------
// Lengthy utility function to read and resolve a FBX vertex data array - that is, the
// output is in polygon vertex order. This logic is used for reading normals, UVs, colors,
// tangents ..
template <typename T>
void ResolveVertexDataArray(std::vector<T>& data_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType,
const char* dataElementName,
const char* indexDataElementName,
size_t vertex_count,
const std::vector<unsigned int>& mapping_counts,
const std::vector<unsigned int>& mapping_offsets,
const std::vector<unsigned int>& mappings)
{
bool isDirect = ReferenceInformationType == "Direct";
bool isIndexToDirect = ReferenceInformationType == "IndexToDirect";
// fall-back to direct data if there is no index data element
if ( isIndexToDirect && !HasElement( source, indexDataElementName ) ) {
isDirect = true;
isIndexToDirect = false;
}
// handle permutations of Mapping and Reference type - it would be nice to
// deal with this more elegantly and with less redundancy, but right
// now it seems unavoidable.
if (MappingInformationType == "ByVertice" && isDirect) {
if (!HasElement(source, dataElementName)) {
return;
}
std::vector<T> tempData;
ParseVectorDataArray(tempData, GetRequiredElement(source, dataElementName));
if (tempData.size() != mapping_offsets.size()) {
FBXImporter::LogError("length of input data unexpected for ByVertice mapping: ",
tempData.size(), ", expected ", mapping_offsets.size());
return;
}
data_out.resize(vertex_count);
for (size_t i = 0, e = tempData.size(); i < e; ++i) {
const unsigned int istart = mapping_offsets[i], iend = istart + mapping_counts[i];
for (unsigned int j = istart; j < iend; ++j) {
data_out[mappings[j]] = tempData[i];
}
}
}
else if (MappingInformationType == "ByVertice" && isIndexToDirect) {
std::vector<T> tempData;
ParseVectorDataArray(tempData, GetRequiredElement(source, dataElementName));
std::vector<int> uvIndices;
ParseVectorDataArray(uvIndices,GetRequiredElement(source,indexDataElementName));
if (uvIndices.size() != vertex_count) {
FBXImporter::LogError("length of input data unexpected for ByVertice mapping: ",
uvIndices.size(), ", expected ", vertex_count);
return;
}
data_out.resize(vertex_count);
for (size_t i = 0, e = uvIndices.size(); i < e; ++i) {
const unsigned int istart = mapping_offsets[i], iend = istart + mapping_counts[i];
for (unsigned int j = istart; j < iend; ++j) {
if (static_cast<size_t>(uvIndices[i]) >= tempData.size()) {
DOMError("index out of range",&GetRequiredElement(source,indexDataElementName));
}
data_out[mappings[j]] = tempData[uvIndices[i]];
}
}
}
else if (MappingInformationType == "ByPolygonVertex" && isDirect) {
std::vector<T> tempData;
ParseVectorDataArray(tempData, GetRequiredElement(source, dataElementName));
if (tempData.size() != vertex_count) {
FBXImporter::LogError("length of input data unexpected for ByPolygon mapping: ",
tempData.size(), ", expected ", vertex_count
);
return;
}
data_out.swap(tempData);
}
else if (MappingInformationType == "ByPolygonVertex" && isIndexToDirect) {
std::vector<T> tempData;
ParseVectorDataArray(tempData, GetRequiredElement(source, dataElementName));
std::vector<int> uvIndices;
ParseVectorDataArray(uvIndices,GetRequiredElement(source,indexDataElementName));
if (uvIndices.size() > vertex_count) {
FBXImporter::LogWarn("trimming length of input array for ByPolygonVertex mapping: ",
uvIndices.size(), ", expected ", vertex_count);
uvIndices.resize(vertex_count);
}
if (uvIndices.size() != vertex_count) {
FBXImporter::LogError("length of input data unexpected for ByPolygonVertex mapping: ",
uvIndices.size(), ", expected ", vertex_count);
return;
}
data_out.resize(vertex_count);
const T empty;
unsigned int next = 0;
for(int i : uvIndices) {
if ( -1 == i ) {
data_out[ next++ ] = empty;
continue;
}
if (static_cast<size_t>(i) >= tempData.size()) {
DOMError("index out of range",&GetRequiredElement(source,indexDataElementName));
}
data_out[next++] = tempData[i];
}
}
else {
FBXImporter::LogError("ignoring vertex data channel, access type not implemented: ",
MappingInformationType, ",", ReferenceInformationType);
}
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadVertexDataNormals(std::vector<aiVector3D>& normals_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType)
{
ResolveVertexDataArray(normals_out,source,MappingInformationType,ReferenceInformationType,
"Normals",
"NormalsIndex",
m_vertices.size(),
m_mapping_counts,
m_mapping_offsets,
m_mappings);
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadVertexDataUV(std::vector<aiVector2D>& uv_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType)
{
ResolveVertexDataArray(uv_out,source,MappingInformationType,ReferenceInformationType,
"UV",
"UVIndex",
m_vertices.size(),
m_mapping_counts,
m_mapping_offsets,
m_mappings);
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadVertexDataColors(std::vector<aiColor4D>& colors_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType)
{
ResolveVertexDataArray(colors_out,source,MappingInformationType,ReferenceInformationType,
"Colors",
"ColorIndex",
m_vertices.size(),
m_mapping_counts,
m_mapping_offsets,
m_mappings);
}
// ------------------------------------------------------------------------------------------------
static const char *TangentIndexToken = "TangentIndex";
static const char *TangentsIndexToken = "TangentsIndex";
void MeshGeometry::ReadVertexDataTangents(std::vector<aiVector3D>& tangents_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType)
{
const char * str = source.Elements().count( "Tangents" ) > 0 ? "Tangents" : "Tangent";
const char * strIdx = source.Elements().count( "Tangents" ) > 0 ? TangentsIndexToken : TangentIndexToken;
ResolveVertexDataArray(tangents_out,source,MappingInformationType,ReferenceInformationType,
str,
strIdx,
m_vertices.size(),
m_mapping_counts,
m_mapping_offsets,
m_mappings);
}
// ------------------------------------------------------------------------------------------------
static const std::string BinormalIndexToken = "BinormalIndex";
static const std::string BinormalsIndexToken = "BinormalsIndex";
void MeshGeometry::ReadVertexDataBinormals(std::vector<aiVector3D>& binormals_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType)
{
const char * str = source.Elements().count( "Binormals" ) > 0 ? "Binormals" : "Binormal";
const char * strIdx = source.Elements().count( "Binormals" ) > 0 ? BinormalsIndexToken.c_str() : BinormalIndexToken.c_str();
ResolveVertexDataArray(binormals_out,source,MappingInformationType,ReferenceInformationType,
str,
strIdx,
m_vertices.size(),
m_mapping_counts,
m_mapping_offsets,
m_mappings);
}
// ------------------------------------------------------------------------------------------------
void MeshGeometry::ReadVertexDataMaterials(std::vector<int>& materials_out, const Scope& source,
const std::string& MappingInformationType,
const std::string& ReferenceInformationType)
{
const size_t face_count = m_faces.size();
if( 0 == face_count )
{
return;
}
// materials are handled separately. First of all, they are assigned per-face
// and not per polyvert. Secondly, ReferenceInformationType=IndexToDirect
// has a slightly different meaning for materials.
ParseVectorDataArray(materials_out,GetRequiredElement(source,"Materials"));
if (MappingInformationType == "AllSame") {
// easy - same material for all faces
if (materials_out.empty()) {
FBXImporter::LogError("expected material index, ignoring");
return;
} else if (materials_out.size() > 1) {
FBXImporter::LogWarn("expected only a single material index, ignoring all except the first one");
materials_out.clear();
}
materials_out.resize(m_vertices.size());
std::fill(materials_out.begin(), materials_out.end(), materials_out.at(0));
} else if (MappingInformationType == "ByPolygon" && ReferenceInformationType == "IndexToDirect") {
materials_out.resize(face_count);
if(materials_out.size() != face_count) {
FBXImporter::LogError("length of input data unexpected for ByPolygon mapping: ",
materials_out.size(), ", expected ", face_count
);
return;
}
} else {
FBXImporter::LogError("ignoring material assignments, access type not implemented: ",
MappingInformationType, ",", ReferenceInformationType);
}
}
// ------------------------------------------------------------------------------------------------
ShapeGeometry::ShapeGeometry(uint64_t id, const Element& element, const std::string& name, const Document& doc)
: Geometry(id, element, name, doc) {
const Scope *sc = element.Compound();
if (nullptr == sc) {
DOMError("failed to read Geometry object (class: Shape), no data scope found");
}
const Element& Indexes = GetRequiredElement(*sc, "Indexes", &element);
const Element& Normals = GetRequiredElement(*sc, "Normals", &element);
const Element& Vertices = GetRequiredElement(*sc, "Vertices", &element);
ParseVectorDataArray(m_indices, Indexes);
ParseVectorDataArray(m_vertices, Vertices);
ParseVectorDataArray(m_normals, Normals);
}
// ------------------------------------------------------------------------------------------------
ShapeGeometry::~ShapeGeometry() {
// empty
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& ShapeGeometry::GetVertices() const {
return m_vertices;
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& ShapeGeometry::GetNormals() const {
return m_normals;
}
// ------------------------------------------------------------------------------------------------
const std::vector<unsigned int>& ShapeGeometry::GetIndices() const {
return m_indices;
}
// ------------------------------------------------------------------------------------------------
LineGeometry::LineGeometry(uint64_t id, const Element& element, const std::string& name, const Document& doc)
: Geometry(id, element, name, doc)
{
const Scope* sc = element.Compound();
if (!sc) {
DOMError("failed to read Geometry object (class: Line), no data scope found");
}
const Element& Points = GetRequiredElement(*sc, "Points", &element);
const Element& PointsIndex = GetRequiredElement(*sc, "PointsIndex", &element);
ParseVectorDataArray(m_vertices, Points);
ParseVectorDataArray(m_indices, PointsIndex);
}
// ------------------------------------------------------------------------------------------------
LineGeometry::~LineGeometry() {
// empty
}
// ------------------------------------------------------------------------------------------------
const std::vector<aiVector3D>& LineGeometry::GetVertices() const {
return m_vertices;
}
// ------------------------------------------------------------------------------------------------
const std::vector<int>& LineGeometry::GetIndices() const {
return m_indices;
}
} // !FBX
} // !Assimp
#endif