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 /*
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 Open Asset Import Library (assimp)
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 /** @file mesh.h
  *  @brief Declares the data structures in which the imported geometry is
     returned by ASSIMP: aiMesh, aiFace and aiBone data structures.
  */
 #pragma once
 #ifndef AI_MESH_H_INC
 #define AI_MESH_H_INC
 
 #ifdef __GNUC__
 #pragma GCC system_header
 #endif
 
 #ifdef _MSC_VER
 #pragma warning(disable : 4351)
 #endif // _MSC_VER
 
 #include <assimp/aabb.h>
 #include <assimp/types.h>
 
 #ifdef __cplusplus
 #include <unordered_set>
 
 extern "C" {
 #endif
 
 // ---------------------------------------------------------------------------
 // Limits. These values are required to match the settings Assimp was
 // compiled against. Therefore, do not redefine them unless you build the
 // library from source using the same definitions.
 // ---------------------------------------------------------------------------
 
 /** @def AI_MAX_FACE_INDICES
  *  Maximum number of indices per face (polygon). */
 
 #ifndef AI_MAX_FACE_INDICES
 #define AI_MAX_FACE_INDICES 0x7fff
 #endif
 
 /** @def AI_MAX_BONE_WEIGHTS
  *  Maximum number of indices per face (polygon). */
 
 #ifndef AI_MAX_BONE_WEIGHTS
 #define AI_MAX_BONE_WEIGHTS 0x7fffffff
 #endif
 
 /** @def AI_MAX_VERTICES
  *  Maximum number of vertices per mesh.  */
 
 #ifndef AI_MAX_VERTICES
 #define AI_MAX_VERTICES 0x7fffffff
 #endif
 
 /** @def AI_MAX_FACES
  *  Maximum number of faces per mesh. */
 
 #ifndef AI_MAX_FACES
 #define AI_MAX_FACES 0x7fffffff
 #endif
 
 /** @def AI_MAX_NUMBER_OF_COLOR_SETS
  *  Supported number of vertex color sets per mesh. */
 
 #ifndef AI_MAX_NUMBER_OF_COLOR_SETS
 #define AI_MAX_NUMBER_OF_COLOR_SETS 0x8
 #endif // !! AI_MAX_NUMBER_OF_COLOR_SETS
 
 /** @def AI_MAX_NUMBER_OF_TEXTURECOORDS
  *  Supported number of texture coord sets (UV(W) channels) per mesh */
 
 #ifndef AI_MAX_NUMBER_OF_TEXTURECOORDS
 #define AI_MAX_NUMBER_OF_TEXTURECOORDS 0x8
 #endif // !! AI_MAX_NUMBER_OF_TEXTURECOORDS
 
 // ---------------------------------------------------------------------------
 /**
  * @brief A single face in a mesh, referring to multiple vertices.
  *
  * If mNumIndices is 3, we call the face 'triangle', for mNumIndices > 3
  * it's called 'polygon' (hey, that's just a definition!).
  * <br>
  * aiMesh::mPrimitiveTypes can be queried to quickly examine which types of
  * primitive are actually present in a mesh. The #aiProcess_SortByPType flag
  * executes a special post-processing algorithm which splits meshes with
  * *different* primitive types mixed up (e.g. lines and triangles) in several
  * 'clean' sub-meshes. Furthermore there is a configuration option (
  * #AI_CONFIG_PP_SBP_REMOVE) to force #aiProcess_SortByPType to remove
  * specific kinds of primitives from the imported scene, completely and forever.
  * In many cases you'll probably want to set this setting to
  * @code
  * aiPrimitiveType_LINE|aiPrimitiveType_POINT
  * @endcode
  * Together with the #aiProcess_Triangulate flag you can then be sure that
  * #aiFace::mNumIndices is always 3.
  * @note Take a look at the @link data Data Structures page @endlink for
  * more information on the layout and winding order of a face.
  */
 struct aiFace {
     //! Number of indices defining this face.
     //! The maximum value for this member is #AI_MAX_FACE_INDICES.
     unsigned int mNumIndices;
 
     //! Pointer to the indices array. Size of the array is given in numIndices.
     unsigned int *mIndices;
 
 #ifdef __cplusplus
 
     //! @brief Default constructor.
     aiFace() AI_NO_EXCEPT
             : mNumIndices(0),
               mIndices(nullptr) {
         // empty
     }
 
     //! @brief Default destructor. Delete the index array
     ~aiFace() {
         delete[] mIndices;
     }
 
     //! @brief Copy constructor. Copy the index array
     aiFace(const aiFace &o) :
             mNumIndices(0), mIndices(nullptr) {
         *this = o;
     }
 
     //! @brief Assignment operator. Copy the index array
     aiFace &operator=(const aiFace &o) {
         if (&o == this) {
             return *this;
         }
 
         delete[] mIndices;
         mNumIndices = o.mNumIndices;
         if (mNumIndices) {
             mIndices = new unsigned int[mNumIndices];
             ::memcpy(mIndices, o.mIndices, mNumIndices * sizeof(unsigned int));
         } else {
             mIndices = nullptr;
         }
 
         return *this;
     }
 
     //! @brief Comparison operator. Checks whether the index array of two faces is identical.
     bool operator==(const aiFace &o) const {
         if (mIndices == o.mIndices) {
             return true;
         }
 
         if (nullptr != mIndices && mNumIndices != o.mNumIndices) {
             return false;
         }
 
         if (nullptr == mIndices) {
             return false;
         }
 
         for (unsigned int i = 0; i < this->mNumIndices; ++i) {
             if (mIndices[i] != o.mIndices[i]) {
                 return false;
             }
         }
 
         return true;
     }
 
     //! @brief Inverse comparison operator. Checks whether the index
     //! array of two faces is NOT identical
     bool operator!=(const aiFace &o) const {
         return !(*this == o);
     }
 #endif // __cplusplus
 }; // struct aiFace
 
 // ---------------------------------------------------------------------------
 /** @brief A single influence of a bone on a vertex.
  */
 struct aiVertexWeight {
     //! Index of the vertex which is influenced by the bone.
     unsigned int mVertexId;
 
     //! The strength of the influence in the range (0...1).
     //! The influence from all bones at one vertex amounts to 1.
     ai_real mWeight;
 
 #ifdef __cplusplus
 
     //! @brief Default constructor
     aiVertexWeight() AI_NO_EXCEPT
             : mVertexId(0),
               mWeight(0.0f) {
         // empty
     }
 
     //! @brief Initialization from a given index and vertex weight factor
     //! \param pID ID
     //! \param pWeight Vertex weight factor
     aiVertexWeight(unsigned int pID, float pWeight) :
             mVertexId(pID), mWeight(pWeight) {
         // empty
     }
 
     bool operator==(const aiVertexWeight &rhs) const {
         return (mVertexId == rhs.mVertexId && mWeight == rhs.mWeight);
     }
 
     bool operator!=(const aiVertexWeight &rhs) const {
         return (*this == rhs);
     }
 
 #endif // __cplusplus
 };
 
 // Forward declare aiNode (pointer use only)
 struct aiNode;
 
 // ---------------------------------------------------------------------------
 /** @brief A single bone of a mesh.
  *
  *  A bone has a name by which it can be found in the frame hierarchy and by
  *  which it can be addressed by animations. In addition it has a number of
  *  influences on vertices, and a matrix relating the mesh position to the
  *  position of the bone at the time of binding.
  */
 struct aiBone {
     /**
      * The name of the bone.
      */
     C_STRUCT aiString mName;
 
     /**
      * The number of vertices affected by this bone.
      * The maximum value for this member is #AI_MAX_BONE_WEIGHTS.
      */
     unsigned int mNumWeights;
 
 #ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
     /**
      * The bone armature node - used for skeleton conversion
      * you must enable aiProcess_PopulateArmatureData to populate this
      */
     C_STRUCT aiNode *mArmature;
 
     /**
      * The bone node in the scene - used for skeleton conversion
      * you must enable aiProcess_PopulateArmatureData to populate this
      */
     C_STRUCT aiNode *mNode;
 
 #endif
     /**
      * The influence weights of this bone, by vertex index.
      */
     C_STRUCT aiVertexWeight *mWeights;
 
     /**
      * Matrix that transforms from mesh space to bone space in bind pose.
      *
      * This matrix describes the position of the mesh
      * in the local space of this bone when the skeleton was bound.
      * Thus it can be used directly to determine a desired vertex position,
      * given the world-space transform of the bone when animated,
      * and the position of the vertex in mesh space.
      *
      * It is sometimes called an inverse-bind matrix,
      * or inverse bind pose matrix.
      */
     C_STRUCT aiMatrix4x4 mOffsetMatrix;
 
 #ifdef __cplusplus
 
     /// @brief  Default constructor
     aiBone() AI_NO_EXCEPT
             : mName(),
               mNumWeights(0),
 #ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
               mArmature(nullptr),
               mNode(nullptr),
 #endif
               mWeights(nullptr),
               mOffsetMatrix() {
         // empty
     }
 
     /// @brief  Copy constructor
     aiBone(const aiBone &other) :
             mName(other.mName),
             mNumWeights(other.mNumWeights),
 #ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
               mArmature(nullptr),
               mNode(nullptr),
 #endif
             mWeights(nullptr),
             mOffsetMatrix(other.mOffsetMatrix) {
         copyVertexWeights(other);
     }
 
     void copyVertexWeights( const aiBone &other ) {
         if (other.mWeights == nullptr || other.mNumWeights == 0) {
             mWeights = nullptr;
             mNumWeights = 0;
             return;
         }
 
         mNumWeights = other.mNumWeights;
         if (mWeights) {
             delete[] mWeights;
         }
 
         mWeights = new aiVertexWeight[mNumWeights];
         ::memcpy(mWeights, other.mWeights, mNumWeights * sizeof(aiVertexWeight));
     }
 
     //! @brief Assignment operator
     aiBone &operator = (const aiBone &other) {
         if (this == &other) {
             return *this;
         }
 
         mName = other.mName;
         mNumWeights = other.mNumWeights;
         mOffsetMatrix = other.mOffsetMatrix;
         copyVertexWeights(other);
 
         return *this;
     }
 
     /// @brief Compare operator.
     bool operator==(const aiBone &rhs) const {
         if (mName != rhs.mName || mNumWeights != rhs.mNumWeights ) {
             return false;
         }
 
         for (size_t i = 0; i < mNumWeights; ++i) {
             if (mWeights[i] != rhs.mWeights[i]) {
                 return false;
             }
         }
 
         return true;
     }
     //! @brief Destructor - deletes the array of vertex weights
     ~aiBone() {
         delete[] mWeights;
     }
 #endif // __cplusplus
 };
 
 // ---------------------------------------------------------------------------
 /** @brief Enumerates the types of geometric primitives supported by Assimp.
  *
  *  @see aiFace Face data structure
  *  @see aiProcess_SortByPType Per-primitive sorting of meshes
  *  @see aiProcess_Triangulate Automatic triangulation
  *  @see AI_CONFIG_PP_SBP_REMOVE Removal of specific primitive types.
  */
 enum aiPrimitiveType {
     /**
      * @brief A point primitive.
      *
      * This is just a single vertex in the virtual world,
      * #aiFace contains just one index for such a primitive.
      */
     aiPrimitiveType_POINT = 0x1,
 
     /**
      * @brief A line primitive.
      *
      * This is a line defined through a start and an end position.
      * #aiFace contains exactly two indices for such a primitive.
      */
     aiPrimitiveType_LINE = 0x2,
 
     /**
      * @brief A triangular primitive.
      *
      * A triangle consists of three indices.
      */
     aiPrimitiveType_TRIANGLE = 0x4,
 
     /**
      * @brief A higher-level polygon with more than 3 edges.
      *
      * A triangle is a polygon, but polygon in this context means
      * "all polygons that are not triangles". The "Triangulate"-Step
      * is provided for your convenience, it splits all polygons in
      * triangles (which are much easier to handle).
      */
     aiPrimitiveType_POLYGON = 0x8,
 
     /**
      * @brief A flag to determine whether this triangles only mesh is NGON encoded.
      *
      * NGON encoding is a special encoding that tells whether 2 or more consecutive triangles
      * should be considered as a triangle fan. This is identified by looking at the first vertex index.
      * 2 consecutive triangles with the same 1st vertex index are part of the same
      * NGON.
      *
      * At the moment, only quads (concave or convex) are supported, meaning that polygons are 'seen' as
      * triangles, as usual after a triangulation pass.
      *
      * To get an NGON encoded mesh, please use the aiProcess_Triangulate post process.
      *
      * @see aiProcess_Triangulate
      * @link https://github.com/KhronosGroup/glTF/pull/1620
      */
     aiPrimitiveType_NGONEncodingFlag = 0x10,
 
     /**
      * This value is not used. It is just here to force the
      * compiler to map this enum to a 32 Bit integer.
      */
 #ifndef SWIG
     _aiPrimitiveType_Force32Bit = INT_MAX
 #endif
 }; //! enum aiPrimitiveType
 
 // Get the #aiPrimitiveType flag for a specific number of face indices
 #define AI_PRIMITIVE_TYPE_FOR_N_INDICES(n) \
     ((n) > 3 ? aiPrimitiveType_POLYGON : (aiPrimitiveType)(1u << ((n)-1)))
 
 // ---------------------------------------------------------------------------
 /** @brief An AnimMesh is an attachment to an #aiMesh stores per-vertex
  *  animations for a particular frame.
  *
  *  You may think of an #aiAnimMesh as a `patch` for the host mesh, which
  *  replaces only certain vertex data streams at a particular time.
  *  Each mesh stores n attached attached meshes (#aiMesh::mAnimMeshes).
  *  The actual relationship between the time line and anim meshes is
  *  established by #aiMeshAnim, which references singular mesh attachments
  *  by their ID and binds them to a time offset.
 */
 struct aiAnimMesh {
     /**Anim Mesh name */
     C_STRUCT aiString mName;
 
     /** Replacement for aiMesh::mVertices. If this array is non-nullptr,
      *  it *must* contain mNumVertices entries. The corresponding
      *  array in the host mesh must be non-nullptr as well - animation
      *  meshes may neither add or nor remove vertex components (if
      *  a replacement array is nullptr and the corresponding source
      *  array is not, the source data is taken instead)*/
     C_STRUCT aiVector3D *mVertices;
 
     /** Replacement for aiMesh::mNormals.  */
     C_STRUCT aiVector3D *mNormals;
 
     /** Replacement for aiMesh::mTangents. */
     C_STRUCT aiVector3D *mTangents;
 
     /** Replacement for aiMesh::mBitangents. */
     C_STRUCT aiVector3D *mBitangents;
 
     /** Replacement for aiMesh::mColors */
     C_STRUCT aiColor4D *mColors[AI_MAX_NUMBER_OF_COLOR_SETS];
 
     /** Replacement for aiMesh::mTextureCoords */
     C_STRUCT aiVector3D *mTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
 
     /** The number of vertices in the aiAnimMesh, and thus the length of all
      * the member arrays.
      *
      * This has always the same value as the mNumVertices property in the
      * corresponding aiMesh. It is duplicated here merely to make the length
      * of the member arrays accessible even if the aiMesh is not known, e.g.
      * from language bindings.
      */
     unsigned int mNumVertices;
 
     /**
      * Weight of the AnimMesh.
      */
     float mWeight;
 
 #ifdef __cplusplus
     /// @brief  The class constructor.
     aiAnimMesh() AI_NO_EXCEPT :
             mVertices(nullptr),
             mNormals(nullptr),
             mTangents(nullptr),
             mBitangents(nullptr),
             mColors {nullptr},
             mTextureCoords{nullptr},
             mNumVertices(0),
             mWeight(0.0f) {
         // empty
     }
 
     /// @brief The class destructor.
     ~aiAnimMesh() {
         delete[] mVertices;
         delete[] mNormals;
         delete[] mTangents;
         delete[] mBitangents;
         for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++) {
             delete[] mTextureCoords[a];
         }
         for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++) {
             delete[] mColors[a];
         }
     }
 
     /**
      *  @brief Check whether the anim-mesh overrides the vertex positions
      *         of its host mesh.
      *  @return true if positions are stored, false if not.
      */
     bool HasPositions() const {
         return mVertices != nullptr;
     }
 
     /**
      *  @brief Check whether the anim-mesh overrides the vertex normals
      *         of its host mesh
      *  @return true if normals are stored, false if not.
      */
     bool HasNormals() const {
         return mNormals != nullptr;
     }
 
     /**
      *  @brief Check whether the anim-mesh overrides the vertex tangents
      *         and bitangents of its host mesh. As for aiMesh,
      *         tangents and bitangents always go together.
      *  @return true if tangents and bi-tangents are stored, false if not.
      */
     bool HasTangentsAndBitangents() const {
         return mTangents != nullptr;
     }
 
     /**
      *  @brief Check whether the anim mesh overrides a particular
      *         set of vertex colors on his host mesh.
      *  @param pIndex 0<index<AI_MAX_NUMBER_OF_COLOR_SETS
      *  @return true if vertex colors are stored, false if not.
      */
 
     bool HasVertexColors(unsigned int pIndex) const {
         return pIndex >= AI_MAX_NUMBER_OF_COLOR_SETS ? false : mColors[pIndex] != nullptr;
     }
 
     /**
      *  @brief Check whether the anim mesh overrides a particular
      *        set of texture coordinates on his host mesh.
      *  @param pIndex 0<index<AI_MAX_NUMBER_OF_TEXTURECOORDS
      *  @return true if texture coordinates are stored, false if not.
      */
     bool HasTextureCoords(unsigned int pIndex) const {
         return pIndex >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? false : mTextureCoords[pIndex] != nullptr;
     }
 
 #endif
 };
 
 // ---------------------------------------------------------------------------
 /** @brief Enumerates the methods of mesh morphing supported by Assimp.
  */
 enum aiMorphingMethod {
     /** Morphing method to be determined */
     aiMorphingMethod_UNKNOWN = 0x0,
 
     /** Interpolation between morph targets */
     aiMorphingMethod_VERTEX_BLEND = 0x1,
 
     /** Normalized morphing between morph targets  */
     aiMorphingMethod_MORPH_NORMALIZED = 0x2,
 
     /** Relative morphing between morph targets  */
     aiMorphingMethod_MORPH_RELATIVE = 0x3,
 
 /** This value is not used. It is just here to force the
      *  compiler to map this enum to a 32 Bit integer.
      */
 #ifndef SWIG
     _aiMorphingMethod_Force32Bit = INT_MAX
 #endif
 }; //! enum aiMorphingMethod
 
 // ---------------------------------------------------------------------------
 /** @brief A mesh represents a geometry or model with a single material.
  *
  * It usually consists of a number of vertices and a series of primitives/faces
  * referencing the vertices. In addition there might be a series of bones, each
  * of them addressing a number of vertices with a certain weight. Vertex data
  * is presented in channels with each channel containing a single per-vertex
  * information such as a set of texture coordinates or a normal vector.
  * If a data pointer is non-null, the corresponding data stream is present.
  * From C++-programs you can also use the comfort functions Has*() to
  * test for the presence of various data streams.
  *
  * A Mesh uses only a single material which is referenced by a material ID.
  * @note The mPositions member is usually not optional. However, vertex positions
  * *could* be missing if the #AI_SCENE_FLAGS_INCOMPLETE flag is set in
  * @code
  * aiScene::mFlags
  * @endcode
  */
 struct aiMesh {
     /**
      * Bitwise combination of the members of the #aiPrimitiveType enum.
      * This specifies which types of primitives are present in the mesh.
      * The "SortByPrimitiveType"-Step can be used to make sure the
      * output meshes consist of one primitive type each.
      */
     unsigned int mPrimitiveTypes;
 
     /**
      * The number of vertices in this mesh.
      * This is also the size of all of the per-vertex data arrays.
      * The maximum value for this member is #AI_MAX_VERTICES.
      */
     unsigned int mNumVertices;
 
     /**
      * The number of primitives (triangles, polygons, lines) in this  mesh.
      * This is also the size of the mFaces array.
      * The maximum value for this member is #AI_MAX_FACES.
      */
     unsigned int mNumFaces;
 
     /**
      * @brief Vertex positions.
      * 
      * This array is always present in a mesh. The array is
      * mNumVertices in size.
      */
     C_STRUCT aiVector3D *mVertices;
 
     /**
      * @brief Vertex normals.
      * 
      * The array contains normalized vectors, nullptr if not present.
      * The array is mNumVertices in size. Normals are undefined for
      * point and line primitives. A mesh consisting of points and
      * lines only may not have normal vectors. Meshes with mixed
      * primitive types (i.e. lines and triangles) may have normals,
      * but the normals for vertices that are only referenced by
      * point or line primitives are undefined and set to QNaN (WARN:
      * qNaN compares to inequal to *everything*, even to qNaN itself.
      * Using code like this to check whether a field is qnan is:
      * @code
      * #define IS_QNAN(f) (f != f)
      * @endcode
      * still dangerous because even 1.f == 1.f could evaluate to false! (
      * remember the subtleties of IEEE754 artithmetics). Use stuff like
      * @c fpclassify instead.
      * @note Normal vectors computed by Assimp are always unit-length.
      * However, this needn't apply for normals that have been taken
      * directly from the model file.
      */
     C_STRUCT aiVector3D *mNormals;
 
     /**
      * @brief Vertex tangents.
      * 
      * The tangent of a vertex points in the direction of the positive
      * X texture axis. The array contains normalized vectors, nullptr if
      * not present. The array is mNumVertices in size. A mesh consisting
      * of points and lines only may not have normal vectors. Meshes with
      * mixed primitive types (i.e. lines and triangles) may have
      * normals, but the normals for vertices that are only referenced by
      * point or line primitives are undefined and set to qNaN.  See
      * the #mNormals member for a detailed discussion of qNaNs.
      * @note If the mesh contains tangents, it automatically also
      * contains bitangents.
      */
     C_STRUCT aiVector3D *mTangents;
 
     /**
      * @brief Vertex bitangents.
      * 
      * The bitangent of a vertex points in the direction of the positive
      * Y texture axis. The array contains normalized vectors, nullptr if not
      * present. The array is mNumVertices in size.
      * @note If the mesh contains tangents, it automatically also contains
      * bitangents.
      */
     C_STRUCT aiVector3D *mBitangents;
 
     /**
      * @brief Vertex color sets.
      * 
      * A mesh may contain 0 to #AI_MAX_NUMBER_OF_COLOR_SETS vertex
      * colors per vertex. nullptr if not present. Each array is
      * mNumVertices in size if present.
      */
     C_STRUCT aiColor4D *mColors[AI_MAX_NUMBER_OF_COLOR_SETS];
 
     /**
      * @brief Vertex texture coordinates, also known as UV channels.
      * 
      * A mesh may contain 0 to AI_MAX_NUMBER_OF_TEXTURECOORDS channels per
      * vertex. Used and unused (nullptr) channels may go in any order.
      * The array is mNumVertices in size.
      */
     C_STRUCT aiVector3D *mTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
 
     /**
      * @brief Specifies the number of components for a given UV channel.
      * 
      * Up to three channels are supported (UVW, for accessing volume
      * or cube maps). If the value is 2 for a given channel n, the
      * component p.z of mTextureCoords[n][p] is set to 0.0f.
      * If the value is 1 for a given channel, p.y is set to 0.0f, too.
      * @note 4D coordinates are not supported
      */
     unsigned int mNumUVComponents[AI_MAX_NUMBER_OF_TEXTURECOORDS];
 
     /**
      * @brief The faces the mesh is constructed from.
      * 
      * Each face refers to a number of vertices by their indices.
      * This array is always present in a mesh, its size is given
      *  in mNumFaces. If the #AI_SCENE_FLAGS_NON_VERBOSE_FORMAT
      * is NOT set each face references an unique set of vertices.
      */
     C_STRUCT aiFace *mFaces;
 
     /**
     * The number of bones this mesh contains. Can be 0, in which case the mBones array is nullptr.
     */
     unsigned int mNumBones;
 
     /**
      * @brief The bones of this mesh.
      * 
      * A bone consists of a name by which it can be found in the
      * frame hierarchy and a set of vertex weights.
      */
     C_STRUCT aiBone **mBones;
 
     /**
      * @brief The material used by this mesh.
      * 
      * A mesh uses only a single material. If an imported model uses
      * multiple materials, the import splits up the mesh. Use this value
      * as index into the scene's material list.
      */
     unsigned int mMaterialIndex;
 
     /**
      *  Name of the mesh. Meshes can be named, but this is not a
      *  requirement and leaving this field empty is totally fine.
      *  There are mainly three uses for mesh names:
      *   - some formats name nodes and meshes independently.
      *   - importers tend to split meshes up to meet the
      *      one-material-per-mesh requirement. Assigning
      *      the same (dummy) name to each of the result meshes
      *      aids the caller at recovering the original mesh
      *      partitioning.
      *   - Vertex animations refer to meshes by their names.
      */
     C_STRUCT aiString mName;
 
     /**
      * The number of attachment meshes.
      * Currently known to work with loaders:
      * - Collada
      * - gltf
      */
     unsigned int mNumAnimMeshes;
 
     /**
      * Attachment meshes for this mesh, for vertex-based animation.
      * Attachment meshes carry replacement data for some of the
      * mesh'es vertex components (usually positions, normals).
      * Currently known to work with loaders:
      * - Collada
      * - gltf
      */
     C_STRUCT aiAnimMesh **mAnimMeshes;
 
     /**
      *  Method of morphing when anim-meshes are specified.
      *  @see aiMorphingMethod to learn more about the provided morphing targets.
      */
     enum aiMorphingMethod mMethod;
 
     /**
      *  The bounding box.
      */
     C_STRUCT aiAABB mAABB;
 
     /**
      * Vertex UV stream names. Pointer to array of size AI_MAX_NUMBER_OF_TEXTURECOORDS
      */
     C_STRUCT aiString **mTextureCoordsNames;
 
 #ifdef __cplusplus
 
     //! The default class constructor.
     aiMesh() AI_NO_EXCEPT
             : mPrimitiveTypes(0),
               mNumVertices(0),
               mNumFaces(0),
               mVertices(nullptr),
               mNormals(nullptr),
               mTangents(nullptr),
               mBitangents(nullptr),
               mColors{nullptr},
               mTextureCoords{nullptr},
               mNumUVComponents{0},
               mFaces(nullptr),
               mNumBones(0),
               mBones(nullptr),
               mMaterialIndex(0),
               mNumAnimMeshes(0),
               mAnimMeshes(nullptr),
               mMethod(aiMorphingMethod_UNKNOWN),
               mAABB(),
               mTextureCoordsNames(nullptr) {
         // empty
     }
 
     //! @brief The class destructor.
     ~aiMesh() {
         delete[] mVertices;
         delete[] mNormals;
         delete[] mTangents;
         delete[] mBitangents;
         for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++) {
             delete[] mTextureCoords[a];
         }
 
         if (mTextureCoordsNames) {
             for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++) {
                 delete mTextureCoordsNames[a];
             }
             delete[] mTextureCoordsNames;
         }
 
         for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++) {
             delete[] mColors[a];
         }
 
         // DO NOT REMOVE THIS ADDITIONAL CHECK
         if (mNumBones && mBones) {
             std::unordered_set<const aiBone *> bones;
             for (unsigned int a = 0; a < mNumBones; a++) {
                 if (mBones[a]) {
                     bones.insert(mBones[a]);
                 }
             }
             for (const aiBone *bone: bones) {
                 delete bone;
             }
             delete[] mBones;
         }
 
         if (mNumAnimMeshes && mAnimMeshes) {
             for (unsigned int a = 0; a < mNumAnimMeshes; a++) {
                 delete mAnimMeshes[a];
             }
             delete[] mAnimMeshes;
         }
 
         delete[] mFaces;
     }
 
     //! @brief Check whether the mesh contains positions. Provided no special
     //!        scene flags are set, this will always be true
     //! @return true, if positions are stored, false if not.
     bool HasPositions() const {
         return mVertices != nullptr && mNumVertices > 0;
     }
 
     //! @brief Check whether the mesh contains faces. If no special scene flags
     //!        are set this should always return true
     //! @return true, if faces are stored, false if not.
     bool HasFaces() const {
         return mFaces != nullptr && mNumFaces > 0;
     }
 
     //! @brief Check whether the mesh contains normal vectors
     //! @return true, if normals are stored, false if not.
     bool HasNormals() const {
         return mNormals != nullptr && mNumVertices > 0;
     }
 
     //! @brief Check whether the mesh contains tangent and bitangent vectors.
     //! 
     //! It is not possible that it contains tangents and no bitangents
     //! (or the other way round). The existence of one of them
     //! implies that the second is there, too.
     //! @return true, if tangents and bi-tangents are stored, false if not.
     bool HasTangentsAndBitangents() const {
         return mTangents != nullptr && mBitangents != nullptr && mNumVertices > 0;
     }
 
     //! @brief Check whether the mesh contains a vertex color set
     //! @param index    Index of the vertex color set
     //! @return true, if vertex colors are stored, false if not.
     bool HasVertexColors(unsigned int index) const {
         if (index >= AI_MAX_NUMBER_OF_COLOR_SETS) {
             return false;
         }
         return mColors[index] != nullptr && mNumVertices > 0;        
     }
 
     //! @brief Check whether the mesh contains a texture coordinate set
     //! @param index    Index of the texture coordinates set
     //! @return true, if texture coordinates are stored, false if not.
     bool HasTextureCoords(unsigned int index) const {
         if (index >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
             return false;
         }
         return (mTextureCoords[index] != nullptr && mNumVertices > 0);
     }
 
     //! @brief Get the number of UV channels the mesh contains.
     //! @return the number of stored uv-channels.
     unsigned int GetNumUVChannels() const {
         unsigned int n(0);
         for (unsigned i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; i++) {
             if (mTextureCoords[i]) {
                 ++n;
             }
         }
 
         return n;
     }
 
     //! @brief Get the number of vertex color channels the mesh contains.
     //! @return The number of stored color channels.
     unsigned int GetNumColorChannels() const {
         unsigned int n(0);
         while (n < AI_MAX_NUMBER_OF_COLOR_SETS && mColors[n]) {
             ++n;
         }
         return n;
     }
 
     //! @brief Check whether the mesh contains bones.
     //! @return true, if bones are stored.
     bool HasBones() const {
         return mBones != nullptr && mNumBones > 0;
     }
 
     //! @brief  Check whether the mesh contains a texture coordinate set name
     //! @param pIndex Index of the texture coordinates set
     //! @return true, if texture coordinates for the index exists.
     bool HasTextureCoordsName(unsigned int pIndex) const {
         if (mTextureCoordsNames == nullptr || pIndex >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
             return false;
         }
         return mTextureCoordsNames[pIndex] != nullptr;
     }
 
     //! @brief  Set a texture coordinate set name
     //! @param pIndex Index of the texture coordinates set
     //! @param texCoordsName name of the texture coordinate set
     void SetTextureCoordsName(unsigned int pIndex, const aiString &texCoordsName) {
         if (pIndex >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
             return;
         }
 
         if (mTextureCoordsNames == nullptr) {
             // Construct and null-init array
             mTextureCoordsNames = new aiString *[AI_MAX_NUMBER_OF_TEXTURECOORDS];
             for (size_t i=0; i<AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
                 mTextureCoordsNames[i] = nullptr;
             }
         }
 
         if (texCoordsName.length == 0) {
             delete mTextureCoordsNames[pIndex];
             mTextureCoordsNames[pIndex] = nullptr;
             return;
         }
 
         if (mTextureCoordsNames[pIndex] == nullptr) {
             mTextureCoordsNames[pIndex] = new aiString(texCoordsName);
             return;
         }
 
         *mTextureCoordsNames[pIndex] = texCoordsName;
     }
 
     //! @brief  Get a texture coordinate set name
     //! @param  pIndex Index of the texture coordinates set
     //! @return The texture coordinate name.
     const aiString *GetTextureCoordsName(unsigned int index) const {
         if (mTextureCoordsNames == nullptr || index >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
             return nullptr;
         }
 
         return mTextureCoordsNames[index];
     }
 
 #endif // __cplusplus
 };
 
 /**
  * @brief  A skeleton bone represents a single bone is a skeleton structure.
  *
  * Skeleton-Animations can be represented via a skeleton struct, which describes
  * a hierarchical tree assembled from skeleton bones. A bone is linked to a mesh.
  * The bone knows its parent bone. If there is no parent bone the parent id is
  * marked with -1.
  * The skeleton-bone stores a pointer to its used armature. If there is no
  * armature this value if set to nullptr.
  * A skeleton bone stores its offset-matrix, which is the absolute transformation
  * for the bone. The bone stores the locale transformation to its parent as well.
  * You can compute the offset matrix by multiplying the hierarchy like:
  * Tree: s1 -> s2 -> s3
  * Offset-Matrix s3 = locale-s3 * locale-s2 * locale-s1
  */
 struct aiSkeletonBone {
     /// The parent bone index, is -1 one if this bone represents the root bone.
     int mParent;
 
 
 #ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
     /// @brief The bone armature node - used for skeleton conversion
     /// you must enable aiProcess_PopulateArmatureData to populate this
     C_STRUCT aiNode *mArmature;
 
     /// @brief The bone node in the scene - used for skeleton conversion
     /// you must enable aiProcess_PopulateArmatureData to populate this
     C_STRUCT aiNode *mNode;
 
 #endif
     /// @brief The number of weights
     unsigned int mNumnWeights;
 
     /// The mesh index, which will get influenced by the weight.
     C_STRUCT aiMesh *mMeshId;
 
     /// The influence weights of this bone, by vertex index.
     C_STRUCT aiVertexWeight *mWeights;
 
     /** Matrix that transforms from bone space to mesh space in bind pose.
      *
      * This matrix describes the position of the mesh
      * in the local space of this bone when the skeleton was bound.
      * Thus it can be used directly to determine a desired vertex position,
      * given the world-space transform of the bone when animated,
      * and the position of the vertex in mesh space.
      *
      * It is sometimes called an inverse-bind matrix,
      * or inverse bind pose matrix.
      */
     C_STRUCT aiMatrix4x4 mOffsetMatrix;
 
     /// Matrix that transforms the locale bone in bind pose.
     C_STRUCT aiMatrix4x4 mLocalMatrix;
 
 #ifdef __cplusplus
     /// @brief The class constructor.
     aiSkeletonBone() :
             mParent(-1),
 #ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
             mArmature(nullptr),
             mNode(nullptr),
 #endif
             mNumnWeights(0),
             mMeshId(nullptr),
             mWeights(nullptr),
             mOffsetMatrix(),
             mLocalMatrix() {
         // empty
     }
 
     /// @brief The class constructor with its parent
     /// @param  parent      The parent node index.
     aiSkeletonBone(unsigned int parent) :
             mParent(parent),
 #ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
             mArmature(nullptr),
             mNode(nullptr),
 #endif
             mNumnWeights(0),
             mMeshId(nullptr),
             mWeights(nullptr),
             mOffsetMatrix(),
             mLocalMatrix() {
         // empty
     }
     /// @brief The class destructor.
     ~aiSkeletonBone() {
         delete[] mWeights;
         mWeights = nullptr;
     }
 #endif // __cplusplus
 };
 /**
  * @brief A skeleton represents the bone hierarchy of an animation.
  *
  * Skeleton animations can be described as a tree of bones:
  *                  root
  *                    |
  *                  node1
  *                  /   \
  *               node3  node4
  * If you want to calculate the transformation of node three you need to compute the
  * transformation hierarchy for the transformation chain of node3:
  * root->node1->node3
  * Each node is represented as a skeleton instance.
  */
 struct aiSkeleton {
     /**
      *  @brief The name of the skeleton instance.
      */
     C_STRUCT aiString mName;
 
     /**
      *  @brief  The number of bones in the skeleton.
      */
     unsigned int mNumBones;
 
     /**
      *  @brief The bone instance in the skeleton.
      */
     C_STRUCT aiSkeletonBone **mBones;
 
 #ifdef __cplusplus
     /**
      *  @brief The class constructor.
      */
     aiSkeleton() AI_NO_EXCEPT : mName(), mNumBones(0), mBones(nullptr) {
         // empty
     }
 
     /**
      *  @brief  The class destructor.
      */
     ~aiSkeleton() {
         delete[] mBones;
     }
 #endif // __cplusplus
 };
 #ifdef __cplusplus
 }
 #endif //! extern "C"
 
 #endif // AI_MESH_H_INC
 

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