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 /*
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 Open Asset Import Library (assimp)
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 /** @file config.h
  *  @brief Defines constants for configurable properties for the library
  *
  *  Typically these properties are set via
  *  #Assimp::Importer::SetPropertyFloat,
  *  #Assimp::Importer::SetPropertyInteger or
  *  #Assimp::Importer::SetPropertyString,
  *  depending on the data type of a property. All properties have a
  *  default value. See the doc for the mentioned methods for more details.
  *
  *  <br><br>
  *  The corresponding functions for use with the plain-c API are:
  *  #aiSetImportPropertyInteger,
  *  #aiSetImportPropertyFloat,
  *  #aiSetImportPropertyString
  */
 #pragma once
 #ifndef AI_CONFIG_H_INC
 #define AI_CONFIG_H_INC
 
 // ###########################################################################
 // LIBRARY SETTINGS
 // General, global settings
 // ###########################################################################
 
 // ---------------------------------------------------------------------------
 /** @brief Enables time measurements.
  *
  *  If enabled, measures the time needed for each part of the loading
  *  process (i.e. IO time, importing, postprocessing, ..) and dumps
  *  these timings to the DefaultLogger. See the @link perf Performance
  *  Page@endlink for more information on this topic.
  *
  * Property type: bool. Default value: false.
  */
 #define AI_CONFIG_GLOB_MEASURE_TIME  \
     "GLOB_MEASURE_TIME"
 
 // ---------------------------------------------------------------------------
 /** @brief Global setting to disable generation of skeleton dummy meshes
  *
  * Skeleton dummy meshes are generated as a visualization aid in cases which
  * the input data contains no geometry, but only animation data.
  * Property data type: bool. Default value: false
  */
 // ---------------------------------------------------------------------------
 #define AI_CONFIG_IMPORT_NO_SKELETON_MESHES \
     "IMPORT_NO_SKELETON_MESHES"
 
 // ###########################################################################
 // POST PROCESSING SETTINGS
 // Various stuff to fine-tune the behavior of a specific post processing step.
 // ###########################################################################
 
 // ---------------------------------------------------------------------------
 /** @brief Maximum bone count per mesh for the SplitbyBoneCount step.
  *
  * Meshes are split until the maximum number of bones is reached. The default
  * value is AI_SBBC_DEFAULT_MAX_BONES, which may be altered at
  * compile-time.
  * Property data type: integer.
  */
 // ---------------------------------------------------------------------------
 #define AI_CONFIG_PP_SBBC_MAX_BONES \
     "PP_SBBC_MAX_BONES"
 
 // default limit for bone count
 #if (!defined AI_SBBC_DEFAULT_MAX_BONES)
 #   define AI_SBBC_DEFAULT_MAX_BONES        60
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief  Specifies the maximum angle that may be between two vertex tangents
  *         that their tangents and bi-tangents are smoothed.
  *
  * This applies to the CalcTangentSpace-Step. The angle is specified
  * in degrees. The maximum value is 175.
  * Property type: float. Default value: 45 degrees
  */
 #define AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE \
     "PP_CT_MAX_SMOOTHING_ANGLE"
 
 // ---------------------------------------------------------------------------
 /** @brief Source UV channel for tangent space computation.
  *
  * The specified channel must exist or an error will be raised.
  * Property type: integer. Default value: 0
  */
 // ---------------------------------------------------------------------------
 #define AI_CONFIG_PP_CT_TEXTURE_CHANNEL_INDEX \
     "PP_CT_TEXTURE_CHANNEL_INDEX"
 
 // ---------------------------------------------------------------------------
 /** @brief  Specifies the maximum angle that may be between two face normals
  *          at the same vertex position that their are smoothed together.
  *
  * Sometimes referred to as 'crease angle'.
  * This applies to the GenSmoothNormals-Step. The angle is specified
  * in degrees, so 180 is PI. The default value is 175 degrees (all vertex
  * normals are smoothed). The maximum value is 175, too. Property type: float.
  * Warning: setting this option may cause a severe loss of performance. The
  * performance is unaffected if the #AI_CONFIG_FAVOUR_SPEED flag is set but
  * the output quality may be reduced.
  */
 #define AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE \
     "PP_GSN_MAX_SMOOTHING_ANGLE"
 
 // ---------------------------------------------------------------------------
 /** @brief Sets the colormap (= palette) to be used to decode embedded
  *         textures in MDL (Quake or 3DGS) files.
  *
  * This must be a valid path to a file. The file is 768 (256*3) bytes
  * large and contains RGB triplets for each of the 256 palette entries.
  * The default value is colormap.lmp. If the file is not found,
  * a default palette (from Quake 1) is used.
  * Property type: string.
  */
 #define AI_CONFIG_IMPORT_MDL_COLORMAP       \
     "IMPORT_MDL_COLORMAP"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_RemoveRedundantMaterials step to
  *  keep materials matching a name in a given list.
  *
  * This is a list of 1 to n strings, ' ' serves as delimiter character.
  * Identifiers containing whitespaces must be enclosed in *single*
  * quotation marks. For example:<tt>
  * "keep-me and_me_to anotherMaterialToBeKept \'name with whitespace\'"</tt>.
  * If a material matches on of these names, it will not be modified or
  * removed by the postprocessing step nor will other materials be replaced
  * by a reference to it. <br>
  * This option might be useful if you are using some magic material names
  * to pass additional semantics through the content pipeline. This ensures
  * they won't be optimized away, but a general optimization is still
  * performed for materials not contained in the list.
  * Property type: String. Default value: n/a
  * @note Linefeeds, tabs or carriage returns are treated as whitespace.
  *   Material names are case sensitive.
  */
 #define AI_CONFIG_PP_RRM_EXCLUDE_LIST   \
     "PP_RRM_EXCLUDE_LIST"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_PreTransformVertices step to
  *  keep the scene hierarchy. Meshes are moved to worldspace, but
  *  no optimization is performed (read: meshes with equal materials are not
  *  joined. The total number of meshes won't change).
  *
  * This option could be of use for you if the scene hierarchy contains
  * important additional information which you intend to parse.
  * For rendering, you can still render all meshes in the scene without
  * any transformations.
  * Property type: bool. Default value: false.
  */
 #define AI_CONFIG_PP_PTV_KEEP_HIERARCHY     \
     "PP_PTV_KEEP_HIERARCHY"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_PreTransformVertices step to normalize
  *  all vertex components into the [-1,1] range. That is, a bounding box
  *  for the whole scene is computed, the maximum component is taken and all
  *  meshes are scaled appropriately (uniformly of course!).
  *  This might be useful if you don't know the spatial dimension of the input
  *  data*/
 #define AI_CONFIG_PP_PTV_NORMALIZE  \
     "PP_PTV_NORMALIZE"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_PreTransformVertices step to use
  *  a users defined matrix as the scene root node transformation before
  *  transforming vertices.
  *  Property type: bool. Default value: false.
  */
 #define AI_CONFIG_PP_PTV_ADD_ROOT_TRANSFORMATION    \
     "PP_PTV_ADD_ROOT_TRANSFORMATION"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_PreTransformVertices step to use
  *  a users defined matrix as the scene root node transformation before
  *  transforming vertices. This property correspond to the 'a1' component
  *  of the transformation matrix.
  *  Property type: aiMatrix4x4.
  */
 #define AI_CONFIG_PP_PTV_ROOT_TRANSFORMATION    \
     "PP_PTV_ROOT_TRANSFORMATION"
 
 // ---------------------------------------------------------------------------
 /** @brief Set epsilon to check the identity of the matrix 4x4.
  *
  * This is used by aiMatrix4x4t<TReal>::IsIdentity(const TReal epsilon).
  * @note The default value is 10e-3f for backward compatibility of legacy code.
  * Property type: Float.
  */
 #define AI_CONFIG_CHECK_IDENTITY_MATRIX_EPSILON \
     "CHECK_IDENTITY_MATRIX_EPSILON"
 
 // default value for AI_CONFIG_CHECK_IDENTITY_MATRIX_EPSILON
 #if (!defined AI_CONFIG_CHECK_IDENTITY_MATRIX_EPSILON_DEFAULT)
 #   define AI_CONFIG_CHECK_IDENTITY_MATRIX_EPSILON_DEFAULT 10e-3f
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_FindDegenerates step to
  *  remove degenerated primitives from the import - immediately.
  *
  * The default behaviour converts degenerated triangles to lines and
  * degenerated lines to points. See the documentation to the
  * #aiProcess_FindDegenerates step for a detailed example of the various ways
  * to get rid of these lines and points if you don't want them.
  * Property type: bool. Default value: false.
  */
 #define AI_CONFIG_PP_FD_REMOVE \
     "PP_FD_REMOVE"
 
 // ---------------------------------------------------------------------------
 /**
  *  @brief  Configures the #aiProcess_FindDegenerates to check the area of a
  *  triangle to be greater than e-6. If this is not the case the triangle will
  *  be removed if #AI_CONFIG_PP_FD_REMOVE is set to true.
  */
 #define AI_CONFIG_PP_FD_CHECKAREA \
     "PP_FD_CHECKAREA"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the #aiProcess_OptimizeGraph step to preserve nodes
  * matching a name in a given list.
  *
  * This is a list of 1 to n strings, ' ' serves as delimiter character.
  * Identifiers containing whitespaces must be enclosed in *single*
  * quotation marks. For example:<tt>
  * "keep-me and_me_to anotherNodeToBeKept \'name with whitespace\'"</tt>.
  * If a node matches on of these names, it will not be modified or
  * removed by the postprocessing step.<br>
  * This option might be useful if you are using some magic node names
  * to pass additional semantics through the content pipeline. This ensures
  * they won't be optimized away, but a general optimization is still
  * performed for nodes not contained in the list.
  * Property type: String. Default value: n/a
  * @note Linefeeds, tabs or carriage returns are treated as whitespace.
  *   Node names are case sensitive.
  */
 #define AI_CONFIG_PP_OG_EXCLUDE_LIST    \
     "PP_OG_EXCLUDE_LIST"
 
 // ---------------------------------------------------------------------------
 /** @brief  Set the maximum number of triangles in a mesh.
  *
  * This is used by the "SplitLargeMeshes" PostProcess-Step to determine
  * whether a mesh must be split or not.
  * @note The default value is AI_SLM_DEFAULT_MAX_TRIANGLES
  * Property type: integer.
  */
 #define AI_CONFIG_PP_SLM_TRIANGLE_LIMIT \
     "PP_SLM_TRIANGLE_LIMIT"
 
 // default value for AI_CONFIG_PP_SLM_TRIANGLE_LIMIT
 #if (!defined AI_SLM_DEFAULT_MAX_TRIANGLES)
 #   define AI_SLM_DEFAULT_MAX_TRIANGLES     1000000
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief  Set the maximum number of vertices in a mesh.
  *
  * This is used by the "SplitLargeMeshes" PostProcess-Step to determine
  * whether a mesh must be split or not.
  * @note The default value is AI_SLM_DEFAULT_MAX_VERTICES
  * Property type: integer.
  */
 #define AI_CONFIG_PP_SLM_VERTEX_LIMIT \
     "PP_SLM_VERTEX_LIMIT"
 
 // default value for AI_CONFIG_PP_SLM_VERTEX_LIMIT
 #if (!defined AI_SLM_DEFAULT_MAX_VERTICES)
 #   define AI_SLM_DEFAULT_MAX_VERTICES      1000000
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief Set the maximum number of bones affecting a single vertex
  *
  * This is used by the #aiProcess_LimitBoneWeights PostProcess-Step.
  * @note The default value is AI_LMW_MAX_WEIGHTS
  * Property type: integer.*/
 #define AI_CONFIG_PP_LBW_MAX_WEIGHTS    \
     "PP_LBW_MAX_WEIGHTS"
 
 // default value for AI_CONFIG_PP_LBW_MAX_WEIGHTS
 #if (!defined AI_LMW_MAX_WEIGHTS)
 #   define AI_LMW_MAX_WEIGHTS   0x4
 #endif // !! AI_LMW_MAX_WEIGHTS
 
 // ---------------------------------------------------------------------------
 /** @brief Lower the deboning threshold in order to remove more bones.
  *
  * This is used by the #aiProcess_Debone PostProcess-Step.
  * @note The default value is AI_DEBONE_THRESHOLD
  * Property type: float.*/
 #define AI_CONFIG_PP_DB_THRESHOLD \
     "PP_DB_THRESHOLD"
 
 // default value for AI_CONFIG_PP_LBW_MAX_WEIGHTS
 #if (!defined AI_DEBONE_THRESHOLD)
 #   define AI_DEBONE_THRESHOLD  1.0f
 #endif // !! AI_DEBONE_THRESHOLD
 
 // ---------------------------------------------------------------------------
 /** @brief Require all bones qualify for deboning before removing any
  *
  * This is used by the #aiProcess_Debone PostProcess-Step.
  * @note The default value is 0
  * Property type: bool.*/
 #define AI_CONFIG_PP_DB_ALL_OR_NONE \
     "PP_DB_ALL_OR_NONE"
 
 /** @brief Default value for the #AI_CONFIG_PP_ICL_PTCACHE_SIZE property
  */
 #ifndef PP_ICL_PTCACHE_SIZE
 #   define PP_ICL_PTCACHE_SIZE 12
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief Set the size of the post-transform vertex cache to optimize the
  *    vertices for. This configures the #aiProcess_ImproveCacheLocality step.
  *
  * The size is given in vertices. Of course you can't know how the vertex
  * format will exactly look like after the import returns, but you can still
  * guess what your meshes will probably have.
  * @note The default value is #PP_ICL_PTCACHE_SIZE. That results in slight
  * performance improvements for most nVidia/AMD cards since 2002.
  * Property type: integer.
  */
 #define AI_CONFIG_PP_ICL_PTCACHE_SIZE   "PP_ICL_PTCACHE_SIZE"
 
 // ---------------------------------------------------------------------------
 /** @brief Enumerates components of the aiScene and aiMesh data structures
  *  that can be excluded from the import using the #aiProcess_RemoveComponent step.
  *
  *  See the documentation to #aiProcess_RemoveComponent for more details.
  */
 enum aiComponent
 {
     /** Normal vectors */
 #ifdef SWIG
     aiComponent_NORMALS = 0x2,
 #else
     aiComponent_NORMALS = 0x2u,
 #endif
 
     /** Tangents and bitangents go always together ... */
 #ifdef SWIG
     aiComponent_TANGENTS_AND_BITANGENTS = 0x4,
 #else
     aiComponent_TANGENTS_AND_BITANGENTS = 0x4u,
 #endif
 
     /** ALL color sets
      * Use aiComponent_COLORn(N) to specify the N'th set */
     aiComponent_COLORS = 0x8,
 
     /** ALL texture UV sets
      * aiComponent_TEXCOORDn(N) to specify the N'th set  */
     aiComponent_TEXCOORDS = 0x10,
 
     /** Removes all bone weights from all meshes.
      * The scenegraph nodes corresponding to the bones are NOT removed.
      * use the #aiProcess_OptimizeGraph step to do this */
     aiComponent_BONEWEIGHTS = 0x20,
 
     /** Removes all node animations (aiScene::mAnimations).
      * The corresponding scenegraph nodes are NOT removed.
      * use the #aiProcess_OptimizeGraph step to do this */
     aiComponent_ANIMATIONS = 0x40,
 
     /** Removes all embedded textures (aiScene::mTextures) */
     aiComponent_TEXTURES = 0x80,
 
     /** Removes all light sources (aiScene::mLights).
      * The corresponding scenegraph nodes are NOT removed.
      * use the #aiProcess_OptimizeGraph step to do this */
     aiComponent_LIGHTS = 0x100,
 
     /** Removes all cameras (aiScene::mCameras).
      * The corresponding scenegraph nodes are NOT removed.
      * use the #aiProcess_OptimizeGraph step to do this */
     aiComponent_CAMERAS = 0x200,
 
     /** Removes all meshes (aiScene::mMeshes). */
     aiComponent_MESHES = 0x400,
 
     /** Removes all materials. One default material will
      * be generated, so aiScene::mNumMaterials will be 1. */
     aiComponent_MATERIALS = 0x800,
 
 
     /** This value is not used. It is just there to force the
      *  compiler to map this enum to a 32 Bit integer. */
 #ifndef SWIG
     _aiComponent_Force32Bit = 0x9fffffff
 #endif
 };
 
 // Remove a specific color channel 'n'
 #define aiComponent_COLORSn(n) (1u << (n+20u))
 
 // Remove a specific UV channel 'n'
 #define aiComponent_TEXCOORDSn(n) (1u << (n+25u))
 
 // ---------------------------------------------------------------------------
 /** @brief Input parameter to the #aiProcess_RemoveComponent step:
  *  Specifies the parts of the data structure to be removed.
  *
  * See the documentation to this step for further details. The property
  * is expected to be an integer, a bitwise combination of the
  * #aiComponent flags defined above in this header. The default
  * value is 0. Important: if no valid mesh is remaining after the
  * step has been executed (e.g you thought it was funny to specify ALL
  * of the flags defined above) the import FAILS. Mainly because there is
  * no data to work on anymore ...
  */
 #define AI_CONFIG_PP_RVC_FLAGS              \
     "PP_RVC_FLAGS"
 
 // ---------------------------------------------------------------------------
 /** @brief Input parameter to the #aiProcess_SortByPType step:
  *  Specifies which primitive types are removed by the step.
  *
  *  This is a bitwise combination of the aiPrimitiveType flags.
  *  Specifying all of them is illegal, of course. A typical use would
  *  be to exclude all line and point meshes from the import. This
  *  is an integer property, its default value is 0.
  */
 #define AI_CONFIG_PP_SBP_REMOVE             \
     "PP_SBP_REMOVE"
 
 // ---------------------------------------------------------------------------
 /** @brief Input parameter to the #aiProcess_FindInvalidData step:
  *  Specifies the floating-point accuracy for animation values. The step
  *  checks for animation tracks where all frame values are absolutely equal
  *  and removes them. This tweakable controls the epsilon for floating-point
  *  comparisons - two keys are considered equal if the invariant
  *  abs(n0-n1)>epsilon holds true for all vector respectively quaternion
  *  components. The default value is 0.f - comparisons are exact then.
  */
 #define AI_CONFIG_PP_FID_ANIM_ACCURACY              \
     "PP_FID_ANIM_ACCURACY"
 
 // ---------------------------------------------------------------------------
 /** @brief Input parameter to the #aiProcess_FindInvalidData step:
  *  Set to true to ignore texture coordinates. This may be useful if you have
  *  to assign different kind of textures like one for the summer or one for the winter.
  */
 #define AI_CONFIG_PP_FID_IGNORE_TEXTURECOORDS        \
     "PP_FID_IGNORE_TEXTURECOORDS"
 
 // TransformUVCoords evaluates UV scalings
 #define AI_UVTRAFO_SCALING 0x1
 
 // TransformUVCoords evaluates UV rotations
 #define AI_UVTRAFO_ROTATION 0x2
 
 // TransformUVCoords evaluates UV translation
 #define AI_UVTRAFO_TRANSLATION 0x4
 
 // Everything baked together -> default value
 #define AI_UVTRAFO_ALL (AI_UVTRAFO_SCALING | AI_UVTRAFO_ROTATION | AI_UVTRAFO_TRANSLATION)
 
 // ---------------------------------------------------------------------------
 /** @brief Input parameter to the #aiProcess_TransformUVCoords step:
  *  Specifies which UV transformations are evaluated.
  *
  *  This is a bitwise combination of the AI_UVTRAFO_XXX flags (integer
  *  property, of course). By default all transformations are enabled
  * (AI_UVTRAFO_ALL).
  */
 #define AI_CONFIG_PP_TUV_EVALUATE               \
     "PP_TUV_EVALUATE"
 
 // ---------------------------------------------------------------------------
 /** @brief A hint to assimp to favour speed against import quality.
  *
  * Enabling this option may result in faster loading, but it needn't.
  * It represents just a hint to loaders and post-processing steps to use
  * faster code paths, if possible.
  * This property is expected to be an integer, != 0 stands for true.
  * The default value is 0.
  */
 #define AI_CONFIG_FAVOUR_SPEED              \
  "FAVOUR_SPEED"
 
 // ###########################################################################
 // IMPORTER SETTINGS
 // Various stuff to fine-tune the behaviour of specific importer plugins.
 // ###########################################################################
 
 // ---------------------------------------------------------------------------
 /** @brief Importers which parse JSON may use this to obtain a pointer to a
  * rapidjson::IRemoteSchemaDocumentProvider.
  *
  * The default value is nullptr
  * Property type: void*
  */
 #define AI_CONFIG_IMPORT_SCHEMA_DOCUMENT_PROVIDER \
     "IMPORT_SCHEMA_DOCUMENT_PROVIDER"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will merge all geometry layers present
  *    in the source file or take only the first.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS \
     "IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read all materials present in the
  *    source file or take only the referenced materials.
  *
  * This is void unless IMPORT_FBX_READ_MATERIALS=1.
  *
  * The default value is false (0)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_ALL_MATERIALS \
     "IMPORT_FBX_READ_ALL_MATERIALS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read materials.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_MATERIALS \
     "IMPORT_FBX_READ_MATERIALS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read embedded textures.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_TEXTURES \
     "IMPORT_FBX_READ_TEXTURES"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read cameras.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_CAMERAS \
     "IMPORT_FBX_READ_CAMERAS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read light sources.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_LIGHTS \
     "IMPORT_FBX_READ_LIGHTS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read animations.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_ANIMATIONS \
     "IMPORT_FBX_READ_ANIMATIONS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will read weights.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_READ_WEIGHTS \
     "IMPORT_FBX_READ_WEIGHTS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will act in strict mode in which only
  *    FBX 2013 is supported and any other sub formats are rejected. FBX 2013
  *    is the primary target for the importer, so this format is best
  *    supported and well-tested.
  *
  * The default value is false (0)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_STRICT_MODE \
     "IMPORT_FBX_STRICT_MODE"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will preserve pivot points for
  *    transformations (as extra nodes). If set to false, pivots and offsets
  *    will be evaluated whenever possible.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_PRESERVE_PIVOTS \
     "IMPORT_FBX_PRESERVE_PIVOTS"
 
 // ---------------------------------------------------------------------------
 /** @brief Specifies whether the importer will drop empty animation curves or
  *    animation curves which match the bind pose transformation over their
  *    entire defined range.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES \
     "IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the fbx importer will use the legacy embedded texture naming.
  *
  * The default value is false (0)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING \
     "AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING"
 
 // ---------------------------------------------------------------------------
 /** @brief  Set wether the importer shall not remove empty bones.
  *
  *  Empty bone are often used to define connections for other models.
  */
 #define AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES \
     "AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES"
 
 
 // ---------------------------------------------------------------------------
 /** @brief  Set wether the FBX importer shall convert the unit from cm to m.
  */
 #define AI_CONFIG_FBX_CONVERT_TO_M \
     "AI_CONFIG_FBX_CONVERT_TO_M"
 
 // ---------------------------------------------------------------------------
 /** @brief  Set whether the FBX importer shall ignore the provided axis configuration
  *
  * If this property is set to true, the axis directions provided in the FBX file
  * will be ignored and the file will be loaded as is.
  *
  * Set to true for Assimp 5.3.x and earlier behavior
  * Equivalent to AI_CONFIG_IMPORT_COLLADA_IGNORE_UP_DIRECTION
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_FBX_IGNORE_UP_DIRECTION \
     "AI_CONFIG_IMPORT_FBX_IGNORE_UP_DIRECTION"
 
 // ---------------------------------------------------------------------------
 /** @brief  Will enable the skeleton struct to store bone data.
  *
  *  This will decouple the bone coupling to the mesh. This feature is
  *  experimental.
  */
 #define AI_CONFIG_FBX_USE_SKELETON_BONE_CONTAINER \
     "AI_CONFIG_FBX_USE_SKELETON_BONE_CONTAINER"
 
 // ---------------------------------------------------------------------------
 /** @brief  Set the vertex animation keyframe to be imported
  *
  * ASSIMP does not support vertex keyframes (only bone animation is supported).
  * The library reads only one frame of models with vertex animations.
  * By default this is the first frame.
  * \note The default value is 0. This option applies to all importers.
  *   However, it is also possible to override the global setting
  *   for a specific loader. You can use the AI_CONFIG_IMPORT_XXX_KEYFRAME
  *   options (where XXX is a placeholder for the file format for which you
  *   want to override the global setting).
  * Property type: integer.
  */
 #define AI_CONFIG_IMPORT_GLOBAL_KEYFRAME    "IMPORT_GLOBAL_KEYFRAME"
 
 #define AI_CONFIG_IMPORT_MD3_KEYFRAME       "IMPORT_MD3_KEYFRAME"
 #define AI_CONFIG_IMPORT_MD2_KEYFRAME       "IMPORT_MD2_KEYFRAME"
 #define AI_CONFIG_IMPORT_MDL_KEYFRAME       "IMPORT_MDL_KEYFRAME"
 #define AI_CONFIG_IMPORT_MDC_KEYFRAME       "IMPORT_MDC_KEYFRAME"
 #define AI_CONFIG_IMPORT_SMD_KEYFRAME       "IMPORT_SMD_KEYFRAME"
 #define AI_CONFIG_IMPORT_UNREAL_KEYFRAME    "IMPORT_UNREAL_KEYFRAME"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read animations.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATIONS "IMPORT_MDL_HL1_READ_ANIMATIONS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read animation events.
  * \note This property requires AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATIONS to be set to true.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATION_EVENTS "IMPORT_MDL_HL1_READ_ANIMATION_EVENTS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether you want to convert the HS1 coordinate system in a special way.
  * The default value is true (S1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_TRANSFORM_COORD_SYSTEM "TRANSFORM COORDSYSTEM FOR HS! MODELS"
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read blend controllers.
  * \note This property requires AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATIONS to be set to true.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_BLEND_CONTROLLERS "IMPORT_MDL_HL1_READ_BLEND_CONTROLLERS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read sequence transition graph.
  * \note This property requires AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATIONS to be set to true.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_SEQUENCE_TRANSITIONS "IMPORT_MDL_HL1_READ_SEQUENCE_TRANSITIONS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read attachments info.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_ATTACHMENTS "IMPORT_MDL_HL1_READ_ATTACHMENTS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read bone controllers info.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_BONE_CONTROLLERS "IMPORT_MDL_HL1_READ_BONE_CONTROLLERS"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read hitboxes info.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_HITBOXES "IMPORT_MDL_HL1_READ_HITBOXES"
 
 // ---------------------------------------------------------------------------
 /** @brief Set whether the MDL (HL1) importer will read miscellaneous global model info.
  *
  * The default value is true (1)
  * Property type: bool
  */
 #define AI_CONFIG_IMPORT_MDL_HL1_READ_MISC_GLOBAL_INFO "IMPORT_MDL_HL1_READ_MISC_GLOBAL_INFO"
 
 // ---------------------------------------------------------------------------
 /** Smd load multiple animations
  *
  *  Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_SMD_LOAD_ANIMATION_LIST "IMPORT_SMD_LOAD_ANIMATION_LIST"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures the AC loader to collect all surfaces which have the
  *    "Backface cull" flag set in separate meshes.
  *
  *  Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_AC_SEPARATE_BFCULL \
     "IMPORT_AC_SEPARATE_BFCULL"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures whether the AC loader evaluates subdivision surfaces (
  *  indicated by the presence of the 'subdiv' attribute in the file). By
  *  default, Assimp performs the subdivision using the standard
  *  Catmull-Clark algorithm
  *
  * * Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_AC_EVAL_SUBDIVISION    \
     "IMPORT_AC_EVAL_SUBDIVISION"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures the UNREAL 3D loader to separate faces with different
  *    surface flags (e.g. two-sided vs. single-sided).
  *
  * * Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_UNREAL_HANDLE_FLAGS \
     "UNREAL_HANDLE_FLAGS"
 
 // ---------------------------------------------------------------------------
 /** @brief Configures the terragen import plugin to compute uv's for
  *  terrains, if not given. Furthermore a default texture is assigned.
  *
  * UV coordinates for terrains are so simple to compute that you'll usually
  * want to compute them on your own, if you need them. This option is intended
  * for model viewers which want to offer an easy way to apply textures to
  * terrains.
  * * Property type: bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_TER_MAKE_UVS \
     "IMPORT_TER_MAKE_UVS"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures the ASE loader to always reconstruct normal vectors
  *  basing on the smoothing groups loaded from the file.
  *
  * Some ASE files have carry invalid normals, other don't.
  * * Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_ASE_RECONSTRUCT_NORMALS    \
     "IMPORT_ASE_RECONSTRUCT_NORMALS"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures the M3D loader to detect and process multi-part
  *    Quake player models.
  *
  * These models usually consist of 3 files, lower.md3, upper.md3 and
  * head.md3. If this property is set to true, Assimp will try to load and
  * combine all three files if one of them is loaded.
  * Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_MD3_HANDLE_MULTIPART \
     "IMPORT_MD3_HANDLE_MULTIPART"
 
 // ---------------------------------------------------------------------------
 /** @brief  Tells the MD3 loader which skin files to load.
  *
  * When loading MD3 files, Assimp checks whether a file
  * [md3_file_name]_[skin_name].skin is existing. These files are used by
  * Quake III to be able to assign different skins (e.g. red and blue team)
  * to models. 'default', 'red', 'blue' are typical skin names.
  * Property type: String. Default value: "default".
  */
 #define AI_CONFIG_IMPORT_MD3_SKIN_NAME \
     "IMPORT_MD3_SKIN_NAME"
 
 // ---------------------------------------------------------------------------
 /** @brief  Specify if to try load Quake 3 shader files. This also controls
  *  original surface name handling: when disabled it will be used unchanged.
  *
  * Property type: bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_MD3_LOAD_SHADERS \
     "IMPORT_MD3_LOAD_SHADERS"
 
 // ---------------------------------------------------------------------------
 /** @brief  Specify the Quake 3 shader file to be used for a particular
  *  MD3 file. This can also be a search path.
  *
  * By default Assimp's behaviour is as follows: If a MD3 file
  * <tt>any_path/models/any_q3_subdir/model_name/file_name.md3</tt> is
  * loaded, the library tries to locate the corresponding shader file in
  * <tt>any_path/scripts/model_name.shader</tt>. This property overrides this
  * behaviour. It can either specify a full path to the shader to be loaded
  * or alternatively the path (relative or absolute) to the directory where
  * the shaders for all MD3s to be loaded reside. Assimp attempts to open
  * <tt>IMPORT_MD3_SHADER_SRC/model_name.shader</tt> first, <tt>IMPORT_MD3_SHADER_SRC/file_name.shader</tt>
  * is the fallback file. Note that IMPORT_MD3_SHADER_SRC should have a terminal (back)slash.
  * Property type: String. Default value: n/a.
  */
 #define AI_CONFIG_IMPORT_MD3_SHADER_SRC \
     "IMPORT_MD3_SHADER_SRC"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures the LWO loader to load just one layer from the model.
  *
  * LWO files consist of layers and in some cases it could be useful to load
  * only one of them. This property can be either a string - which specifies
  * the name of the layer - or an integer - the index of the layer. If the
  * property is not set the whole LWO model is loaded. Loading fails if the
  * requested layer is not available. The layer index is zero-based and the
  * layer name may not be empty.<br>
  * Property type: Integer. Default value: all layers are loaded.
  */
 #define AI_CONFIG_IMPORT_LWO_ONE_LAYER_ONLY         \
     "IMPORT_LWO_ONE_LAYER_ONLY"
 
 // ---------------------------------------------------------------------------
 /** @brief  Configures the MD5 loader to not load the MD5ANIM file for
  *  a MD5MESH file automatically.
  *
  * The default strategy is to look for a file with the same name but the
  * MD5ANIM extension in the same directory. If it is found, it is loaded
  * and combined with the MD5MESH file. This configuration option can be
  * used to disable this behaviour.
  *
  * * Property type: bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD           \
     "IMPORT_MD5_NO_ANIM_AUTOLOAD"
 
 // ---------------------------------------------------------------------------
 /** @brief Defines the begin of the time range for which the LWS loader
  *    evaluates animations and computes aiNodeAnim's.
  *
  * Assimp provides full conversion of LightWave's envelope system, including
  * pre and post conditions. The loader computes linearly subsampled animation
  * chanels with the frame rate given in the LWS file. This property defines
  * the start time. Note: animation channels are only generated if a node
  * has at least one envelope with more tan one key assigned. This property.
  * is given in frames, '0' is the first frame. By default, if this property
  * is not set, the importer takes the animation start from the input LWS
  * file ('FirstFrame' line)<br>
  * Property type: Integer. Default value: taken from file.
  *
  * @see AI_CONFIG_IMPORT_LWS_ANIM_END - end of the imported time range
  */
 #define AI_CONFIG_IMPORT_LWS_ANIM_START         \
     "IMPORT_LWS_ANIM_START"
 #define AI_CONFIG_IMPORT_LWS_ANIM_END           \
     "IMPORT_LWS_ANIM_END"
 
 // ---------------------------------------------------------------------------
 /** @brief Defines the output frame rate of the IRR loader.
  *
  * IRR animations are difficult to convert for Assimp and there will
  * always be a loss of quality. This setting defines how many keys per second
  * are returned by the converter.<br>
  * Property type: integer. Default value: 100
  */
 #define AI_CONFIG_IMPORT_IRR_ANIM_FPS               \
     "IMPORT_IRR_ANIM_FPS"
 
 // ---------------------------------------------------------------------------
 /** @brief Ogre Importer will try to find referenced materials from this file.
  *
  * Ogre meshes reference with material names, this does not tell Assimp the file
  * where it is located in. Assimp will try to find the source file in the following
  * order: <material-name>.material, <mesh-filename-base>.material and
  * lastly the material name defined by this config property.
  * <br>
  * Property type: String. Default value: Scene.material.
  */
 #define AI_CONFIG_IMPORT_OGRE_MATERIAL_FILE \
     "IMPORT_OGRE_MATERIAL_FILE"
 
 // ---------------------------------------------------------------------------
 /** @brief Ogre Importer detect the texture usage from its filename.
  *
  * Ogre material texture units do not define texture type, the textures usage
  * depends on the used shader or Ogre's fixed pipeline. If this config property
  * is true Assimp will try to detect the type from the textures filename postfix:
  * _n, _nrm, _nrml, _normal, _normals and _normalmap for normal map, _s, _spec,
  * _specular and _specularmap for specular map, _l, _light, _lightmap, _occ
  * and _occlusion for light map, _disp and _displacement for displacement map.
  * The matching is case insensitive. Post fix is taken between the last
  * underscore and the last period.
  * Default behavior is to detect type from lower cased texture unit name by
  * matching against: normalmap, specularmap, lightmap and displacementmap.
  * For both cases if no match is found aiTextureType_DIFFUSE is used.
  * <br>
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_OGRE_TEXTURETYPE_FROM_FILENAME \
     "IMPORT_OGRE_TEXTURETYPE_FROM_FILENAME"
 
  /** @brief Specifies whether the Android JNI asset extraction is supported.
   *
   * Turn on this option if you want to manage assets in native
   * Android application without having to keep the internal directory and asset
   * manager pointer.
   */
  #define AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT "AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT"
 
 // ---------------------------------------------------------------------------
 /** @brief Specifies whether the IFC loader skips over IfcSpace elements.
  *
  * IfcSpace elements (and their geometric representations) are used to
  * represent, well, free space in a building storey.<br>
  * Property type: Bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS "IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS"
 
 // ---------------------------------------------------------------------------
 /** @brief Specifies whether the IFC loader will use its own, custom triangulation
  *   algorithm to triangulate wall and floor meshes.
  *
  * If this property is set to false, walls will be either triangulated by
  * #aiProcess_Triangulate or will be passed through as huge polygons with
  * faked holes (i.e. holes that are connected with the outer boundary using
  * a dummy edge). It is highly recommended to set this property to true
  * if you want triangulated data because #aiProcess_Triangulate is known to
  * have problems with the kind of polygons that the IFC loader spits out for
  * complicated meshes.
  * Property type: Bool. Default value: true.
  */
 #define AI_CONFIG_IMPORT_IFC_CUSTOM_TRIANGULATION "IMPORT_IFC_CUSTOM_TRIANGULATION"
 
 // ---------------------------------------------------------------------------
 /** @brief  Set the tessellation conic angle for IFC smoothing curves.
  *
  * This is used by the IFC importer to determine the tessellation parameter
  * for smoothing curves.
  * @note The default value is AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE and the
  * accepted values are in range [5.0, 120.0].
  * Property type: Float.
  */
 #define AI_CONFIG_IMPORT_IFC_SMOOTHING_ANGLE "IMPORT_IFC_SMOOTHING_ANGLE"
 
 // default value for AI_CONFIG_IMPORT_IFC_SMOOTHING_ANGLE
 #if (!defined AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE)
 #   define AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE 10.0f
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief  Set the tessellation for IFC cylindrical shapes.
  *
  * This is used by the IFC importer to determine the tessellation parameter
  * for cylindrical shapes, i.e. the number of segments used to approximate a circle.
  * @note The default value is AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION and the
  * accepted values are in range [3, 180].
  * Property type: Integer.
  */
 #define AI_CONFIG_IMPORT_IFC_CYLINDRICAL_TESSELLATION "IMPORT_IFC_CYLINDRICAL_TESSELLATION"
 
 // default value for AI_CONFIG_IMPORT_IFC_CYLINDRICAL_TESSELLATION
 #if (!defined AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION)
 #   define AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION 32
 #endif
 
 // ---------------------------------------------------------------------------
 /** @brief Specifies whether the Collada loader will ignore the provided up direction.
  *
  * If this property is set to true, the up direction provided in the file header will
  * be ignored and the file will be loaded as is.
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_COLLADA_IGNORE_UP_DIRECTION "IMPORT_COLLADA_IGNORE_UP_DIRECTION"
 
 // ---------------------------------------------------------------------------
 /** @brief Specifies whether the Collada loader will ignore the provided unit size.
  *
  * If this property is set to true, the unit size provided in the file header will
  * be ignored and the file will be loaded without scaling the assets.
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_COLLADA_IGNORE_UNIT_SIZE "IMPORT_COLLADA_IGNORE_UNIT_SIZE"
 
 // ---------------------------------------------------------------------------
 /** @brief Specifies whether the Collada loader should use Collada names.
  *
  * If this property is set to true, the Collada names will be used as the node and
  * mesh names. The default is to use the id tag (resp. sid tag, if no id tag is present)
  * instead.
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_IMPORT_COLLADA_USE_COLLADA_NAMES "IMPORT_COLLADA_USE_COLLADA_NAMES"
 
 // ---------- All the Export defines ------------
 
 /** @brief Specifies the xfile use double for real values of float
  *
  * Property type: Bool. Default value: false.
  */
 
 #define AI_CONFIG_EXPORT_XFILE_64BIT "EXPORT_XFILE_64BIT"
 
 /** @brief Specifies whether the assimp export shall be able to export point clouds
  *
  *  When this flag is not defined the render data has to contain valid faces.
  *  Point clouds are only a collection of vertices which have nor spatial organization
  *  by a face and the validation process will remove them. Enabling this feature will
  *  switch off the flag and enable the functionality to export pure point clouds.
  *
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_EXPORT_POINT_CLOUDS "EXPORT_POINT_CLOUDS"
 
 /** @brief Specifies whether to use the deprecated KHR_materials_pbrSpecularGlossiness extension
  * 
  * When this flag is undefined any material with specularity will use the new KHR_materials_specular
  * extension. Enabling this flag will revert to the deprecated extension. Note that exporting
  * KHR_materials_pbrSpecularGlossiness with extensions other than KHR_materials_unlit is unsupported,
  * including the basic pbrMetallicRoughness spec.
  *
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_USE_GLTF_PBR_SPECULAR_GLOSSINESS "USE_GLTF_PBR_SPECULAR_GLOSSINESS"
 
 /** @brief Specifies whether to apply a limit on the number of four bones per vertex in skinning
  *
  * When this flag is not defined, all bone weights and indices are limited to a
  * maximum of four bones for each vertex (attributes JOINT_0 and WEIGHT_0 only).
  * By enabling this flag, the number of bones per vertex is unlimited.
  * In both cases, indices and bone weights are sorted by weight in descending order.
  * In the case of the limit of up to four bones, a maximum of the four largest values are exported.
  * Weights are not normalized.
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_EXPORT_GLTF_UNLIMITED_SKINNING_BONES_PER_VERTEX \
         "USE_UNLIMITED_BONES_PER VERTEX"
 
 /** @brief Specifies whether to write the value referenced to opacity in TransparencyFactor of each material. 
  *
  * When this flag is not defined, the TransparencyFactor value of each meterial is 1.0.
  * By enabling this flag, the value is 1.0 - opacity;
 
  * Property type: Bool. Default value: false.
  */
 #define AI_CONFIG_EXPORT_FBX_TRANSPARENCY_FACTOR_REFER_TO_OPACITY \
         "EXPORT_FBX_TRANSPARENCY_FACTOR_REFER_TO_OPACITY"
 
 /**
  * @brief Specifies the blob name, assimp uses for exporting.
  * 
  * Some formats require auxiliary files to be written, that need to be linked back into 
  * the original file. For example, OBJ files export materials to a separate MTL file and
  * use the `mtllib` keyword to reference this file.
  * 
  * When exporting blobs using #ExportToBlob, assimp does not know the name of the blob
  * file and thus outputs `mtllib $blobfile.mtl`, which might not be desired, since the 
  * MTL file might be called differently. 
  * 
  * This property can be used to give the exporter a hint on how to use the magic 
  * `$blobfile` keyword. If the exporter detects the keyword and is provided with a name
  * for the blob, it instead uses this name.
  */
 #define AI_CONFIG_EXPORT_BLOB_NAME "EXPORT_BLOB_NAME"
 
 /**
  *  @brief  Specifies a global key factor for scale, float value
  */
 #define AI_CONFIG_GLOBAL_SCALE_FACTOR_KEY "GLOBAL_SCALE_FACTOR"
 
 #if (!defined AI_CONFIG_GLOBAL_SCALE_FACTOR_DEFAULT)
 #   define AI_CONFIG_GLOBAL_SCALE_FACTOR_DEFAULT  1.0f
 #endif // !! AI_DEBONE_THRESHOLD
 
 #define AI_CONFIG_APP_SCALE_KEY "APP_SCALE_FACTOR"
 
 #if (!defined AI_CONFIG_APP_SCALE_KEY)
 #   define AI_CONFIG_APP_SCALE_KEY 1.0
 #endif // AI_CONFIG_APP_SCALE_KEY
 
 
 // ---------- All the Build/Compile-time defines ------------
 
 /** @brief Specifies if double precision is supported inside assimp
  *
  * Property type: Bool. Default value: undefined.
  */
 
 /* #undef ASSIMP_DOUBLE_PRECISION */
 
 #endif // !! AI_CONFIG_H_INC

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