《信息技术 形状建模信息表示 第4部分：存储格式》

CAD形状模型文件、层级结构、实体、几何拓扑对象、多表示数据、特征约束和属性3.2.1table结构tableObjectRef{table_kind:INT;object_id:STRING;}3.2.2struct结构structVec3f{x:float;y:float;z:float;}structVec3d{x:double;y:double;z:double;}3.2.3属性定义boolproducermodified_at0毫米，l厘米，2米0度，l弧度root_composite_ref//坐标系定义structCoordinateSystem{origin:Vec3d;x_axis:Vec3d;y_axis:Vec3d;z_axis:Vec3d;handedness:INT;//坐标系手性，0表示右手系，1表示左手系coordinate_type:INT;//坐标系类型，0表示笛卡尔坐标系，1表示柱坐标系，2表示球坐标系}tableHeader{magic:STRING;format_version:INT;structure_version:INT;producer:STRING;created_at:STRING;modified_at:STRING;lengthUnit:INT;angleUnit:INT;coordinate_system:SEM;root_composite_ref:STRING;}parent_refchild_composite_refsoccurrence_refsproperty_set_refstableComposite{object_id:STRING;name:STRING;parent_ref:STRING;child_composite_refs:[STRING];occurrence_refs:[STRING];property_set_refs:[STRING];} 4.3实体（Entity）geometry_refsrepresentation_refsfeature_refsconstraint_refsappearance_refsproperty_refsobject_id:STRING;name:STRING;entity_type:INT;geometry_refs:[STRING];representation_refs:[STRING];feature_refs:[STRING];constraint_refs:[STRING];appearance_refs:[STRING];property_refs:[STRING];}parent_composite_reftarget_entity_reftransform_refsappearance_refsproperty_refsnamespaceCADModel.Organization;tableOccurrence{object_id:STRING;name:STRING;parent_composite_ref:STRING;target_entity_ref:STRING;transform_refs:[STRING];appearance_refs:[STRING];property_refs:[STRING];}parent_space_reftarget_space_ref当前实例相较于父坐标空间的4×4齐次变translationrotationstructQuaternion{x:REAL;y:REAL;w:REAL;}tableTransform{object_id:STRING;matrix:Matrix;translation:Vec3d;rotation:SEM;scale:Vec3d;parent_space_ref:STRING;target_space_ref:STRING;}4.5.1定位矩阵4.5.2实例复用变换逻辑5.2几何表-basic_geometry_table_refparametric_curve_table_refbasic_surface_table_refparametric_surface_table_refbasic_solid_table_refbasic_geometry_table_parametric_curve_table_rbasic_surface_table_parametric_surface_tablebasic_solid_table_r}5.2.1基本几何-point_refsline_refsline_segment_refstriangle_refscircle_refsarc_refsellipse_refstableBasicGeometryTable{object_id:STRING;point_refs:[STRING];line_refs:[STRING];line_segment_refs:[STRING];triangle_refs:[STRING];circle_refs:[STRING];arc_refs:[STRING];ellipse_refs:[STRING];}点-}直线-point_refdirection:Vec3d;}直线段-start_point_refend_point_ref}三角形-point_refs}圆-center_refradiusx_axis:Vec3d;y_axis:Vec3d;normal:Vec3d;}圆弧-center_refradiusstart_point_refend_point_refx_axis:Vec3d;y_axis:Vec3d;normal:Vec3d;}椭圆-center_refmajor_radiusminor_radiusmajor_axis:Vec3d;minor_axis:Vec3d;normal:Vec3d;}5.2.2参数曲线-bezier_curve_refsbspline_curve_refsnurbs_curve_refsintersection_curve_refsoffset_curve_refstrimmed_curve_refscomposite_curve_refstableParametricCurveTaintersection_curve_refoffset_curve_refs:[STtrimmed_curve_refs:[STRIcomposite_curve_refs}贝齐尔（Bezier）曲线-parameter_startparameter_end}B样条曲线-knot_count≥control_point_count+dknotsparameter_start-parameter_end-}-weight_count=control_point_countknot_count≥control_point_countknotsparameter_start-parameter_end-}交线-base_surface_refsstart_point_ref-end_point_ref-internal_point_refsparameter_typeparameterchord_height_toleratangent_angle_tolerancemax_chord_lengthtableIntersectionCtangent_angle_tolerance:RE}等距线-base_curve_ref-normal_vectorreference_geometry_ref-parameter_start-parameter_end-组合曲线normal_vector:Vec3d;}裁剪曲线-base_curve_ref---start_point_ref-end_point_ref-0=same,l=opposite}-component_curve_coucomponent_curve_refsparameter_start-parameter_end-component_curve_refs}5.2.3基本曲面-plane_surface_refscylindrical_surface_refsconical_surface_refsspherical_surface_refsellipsoidal_surface_refstoroidal_surface_refsregular_prism_surface_refs圆柱面regular_pyramid_surface_refstableBasicSurfaceTcylindrical_surface_refs:conical_surface_refsspherical_surface_rellipsoidal_surface_refs:[STtoroidal_surface_refs:[STRINregular_prism_surface_rregular_pyramid_surface_re}平面-origin:Vec3d;x_axis:Vec3d;y_axis:Vec3d;normal:Vec3d;}-radiustableCylindricalSurorigin:Vec3d;x_axis:Vec3d;y_axis:Vec3d;axis:Vec3d;}圆锥面-apex:Vec3d;x_axis:Vec3d;y_axis:Vec3d;}球面-radiuscenter:Vec3d;x_axis:Vec3d;y_axis:Vec3d;z_axis:Vec3d;}椭球面-x_radiusy_radiusX主轴单位方向向量Z主轴单位方向向量tableEllipsoidalSurcenter:Vec3d;x_axis:Vec3d;y_axis:Vec3d;z_axis:Vec3d;}圆环面-major_radiusminor_radiuscenter:Vec3d;x_axis:Vec3d;y_axis:Vec3d;axis:Vec3d;}正棱柱面-base_centerheightbase_vertex_directiontableRegularPrismSubase_center:Vec3d;base_vertex_direction:Vec3d;normal:Vec3d;}正棱锥面-base_centerheightbase_vertex_directiontableRegularPyramidSurfbase_center:Vec3d;base_vertex_direction:Vec3d;normal:Vec3d;}5.2.4参数曲面-bezier_surface_refsbspline_surface_refsnurbs_surface_refstspline_surface_refsruled_surface_refsrevolved_surface_refsswept_surface_refsoffset_surface_refsblend_surface_refstrimmed_surface_refsbezier_surface_refsbspline_surface_refstspline_surface_refs:[STRINoffset_surface_refs:[STRtrimmed_surface_refs:[STRIN}张量积Bezier曲面-u_degreeU参数方向次数u_control_point_countU参数方向控制点个数v_control_point_countu_endv_endv_control_point_count:}B样条曲面B样条曲面对象唯一索引-u_degreeU参数方向次数u_control_point_U方向控制点个数v_control_point_u_knot_count≥u_control_point_count+u_degree+1v_knot_count≥v_control_point_count+v_degree+1u_knotsU参数方向节点矢量v_knots-u_end--v_end-U方向是否闭合v_control_point_count:}-u_degreeU参数方向次数u_control_point U参数方向控制点个数v_control_point u_knot_count≥u_control_point_count+u_v_knot_count≥v_control_point_count+v_u_knotsU参数方向节点矢量v_knotsv_control_point_count:}T样条曲面-u_local_knotsv_local_knots}直纹面-base_curve_refsecond_curve_refdirection:Vec3d;}旋转面-profile_curve_refaxis_origin:Vec3d;axis_direction:Vec3d;}扫掠面-profile_curve_refspine_curve_ref}等距面-base_surface_ref}过渡面-base_surface_refsspine_curve_ref}0裁剪曲面-base_surface_reftrim_loop_refsouter_loop_refinner_loop_refstrim_loop_refs:[STRIN}5.2.5基本几何体-cuboid_solid_refscylinder_solid_refscone_solid_refssphere_solid_refsregular_pyramid_solid_refsregular_frustum_solid_refscylinder_solid_refsregular_pyramid_solid_r}长方体-heightcenter:Vec3d;x_axis:Vec3d;y_axis:Vec3d;}圆柱体-base_centerheightradiusbase_center:Vec3d;axis:Vec3d;}圆锥体-base_centerheightradiusbase_center:Vec3d;}球体-radiuscenter:Vec3d;}正棱锥体-base_centerheightbase_vertex_directiontableRegularPyramidbase_center:Vec3d;normal:Vec3d;}正棱台体-base_centerheightbottom_edge_lengthtop_edge_lengthbase_vertex_directiontableRegularFrustumbase_center:Vec3d;base_vertex_direction:Vec3d;normal:Vec3d;}5.3拓扑表-vertex_refsedge_refscoedge_refswire_refsloop_refsface_refsshell_refssolid_refsface_refs:[STRING];}5.3.1顶点-point_refedge_refs}5.3.2边-start_vertex_refend_vertex_refcurve_refparameter_start-parameter_end-tolerancecoedge_refsproperty_refs}5.3.3有向边-edge_refloop_refface_refnext_coedge_refprevious_coedge_refpartner_coedge_refsparameter_curve_refproperty_refsface_ref:STRING;partner_coedge_refs}5.3.4线框-coedge_refsproperty_refs}5.3.5环-2=inner_loop,3=wire_loop,4coedge_refsvertex_refface_refproperty_refsface_ref:STRING;}5.3.6面-surface_refouter_loop_refinner_loop_refspositeproperty_refs}5.3.7壳-face_refswire_refsproperty_refsface_num:INT;face_refs:[STRING];}5.3.8体-outer_shell_refinner_shell_refsproperty_refs}-body_refsbrep_representation_refspolyhedron_mesh_representation_refspoint_cloud_representation_refspolyline_representation_refsesentation_refspresentation_refsparticle_system_representation_refsntation_refsimplicit_neural_reprntation_refsbrep_representation_refs:polyhedron_mesh_representation_refs:[STRING];point_cloud_representation_refspolyline_representation_refs:subdivision_curve_representation_refs:subdivision_surface_representation_refsparticle_system_representation_refs:gaussian_splat_representation_refs:[STRINimplicit_neural_representation_refs}5.4.1形体容器-solid_refssheet_refswire_refsrepresentation_refsproperty_refs}B-Rep表示对象唯一编号-body_ref≥ltoleranceB-Rep几何与拓扑连接容差bounding_volume_refproperty_refs}5.4.3多边形表面网格表示-vertexnumvertices_accessornormals_accessortexcoords_accessorproperty_refstablePolyhedronMeshRepresentatiovertices_accessor:STRface_num:INT;texcoords_accessor:STR}5.4.4点云表示-point_count≥lposition_accessornormal_accessorpoint_attribute_accesscoordinate_system_refproperty_refspoint_attribute_accessorscoordinate_system_r}5.4.5简单折线表示-point_countpoint_refsposition_accessorpolyline_typeproperty_refstablePolylineRepresenta}5.4.6细分曲线表示-base_polyline_refproperty_refstableSubdivisionCurveRepresentation{}5.4.7细分曲面表示-base_mesh_reflimit_surface_refproperty_refstableSubdivisionSurfaceRepresentation{}5.4.8粒子系统表示-base_point_cloud_refparticle_countposition_accessorradius_accessorvelocity_accessorpressure_accessorvector_field_accessorscoordinate_system_refproperty_refs}-position_accessorrotation_accessorproperty_refstableGaussianSplatRepresentation{opacity_accessor:ST}5.4.10隐式与神经表示-bounding_boxnormalization_matrix4×4仿射变换矩阵，用-representation_type0=SDF,l=volume_densince_field,4=other式0=none,l=frequency_encoding,2=multi_resolution_hash_grid,3=othernetwork_topology[32,64,64,l]weight_payload_uri件的统一资源标识符model_refparameter_accessorfeature_grid_ref≥lresolutioncoordinate_system_refproperty_refstableImplicitNeuralRepresentation{weight_payload_uri:STRING;feature_grid_ref:STRING;coordinate_system_r}5.5特征表符-feature_refsure_element_refsparameter_feature_element_refs_element_refsure_element_refs表port_set_refson_refsn_refsption_refsfeature_refs:[STRING];geometry_feature_element_refs:[STRIparameter_feature_element_refs:datum_feature_element_refs:[STcollection_feature_element_refsgeometry_support_set_refs:[STRfeature_direction_refs:[STRING];feature_relation_refs:[STRING];feature_description_refs:[STRING];}5.5.1特征-特征语义类别，如pattern等element_refssupport_set_refsdirection_refsconstraint_refsrelation_refsdescription_refsproperty_refsfeature_type:INT;description_refs:[S}5.5.2几何类特征元素-t_region,7=othergeometry_refstopology_refsrepresentation_refs关联的多表示对象ID列表support_set_refdirection_refstoleranceproperty_refs关联扩展属性对象ID列表tableGeometryFeatureElemen}5.5.3参数类特征元素-parameter_typeius,3=diameter,4=distance,5=count,6=bool_stbool_valueunit_reftarget_refsconstraint_refsproperty_refs关联扩展属性对象ID列表}5.5.4基准类特征元素-position当当当向当向当向当表reference_refs征或坐标系对象IDsupport_set_ref表direction_refs表property_refsposition:Vec3d;origin:Vec3d;direction:Vec3d;normal:Vec3d;x_axis:Vec3d;y_axis:Vec3d;z_axis:Vec3d;}5.5.5集合类特征元素-_set,2=pattern_set,3=semantic_group,4=othermember_feature_refsnt_refsreference_refproperty_refstableCollectionFeatureElememember_feature_refs:[STRmember_element_refs:[STR}5.5.6几何支撑集号-ef,2=surface_support,3=soupport,4=discrete_support,5=geometry_refstopology_refsrepresentation_refsparameter_domain_refseftarget_element_ref:STRparameter_domain_ref}5.5.7特征方向号-_refvectorreference_point_refparameter_position_refs位置对象ID列表support_set_refproperty_refstarget_element_ref:STRvector:Vec3d;parameter_position_refs}5.5.8特征组合与依赖-source_feature_reftarget_feature_refparent_feature_refchild_feature_refselement_refsparameter_refs参数类特征元素ID列表constraint_refsrelation_expressionpropagation_orderproperty_refstarget_feature_ref:STR}5.5.9特征描述-target_refimage,4=video,5=semantic,geometry_refe_refAI或规则识别产生[0,l]property_refsexternal_resource_ref:}5.5.10存储示例tableExtrudeFeatureExamfeature_ref:STRING;profile_element_refsdepth_parameter_refoperation_parameter_ref:ST}-logical_constraint_refsdimensional_constraint_refsequation_inequality_constra_refs方程及不等式约束对象ID列表continuity_constraint_refscomposite_constraint_refstableConstraint{object_id:STRING;logical_constraint_refs:[STRING];dimensional_constraint_refs:[STRING];equation_inequality_constraint_refs:[STRING];continuity_constraint_refs:[STRING];composite_constraint_refs:[STRING];}5.6.1逻辑约束-coincident_constraint_refsparallel_constraint_refsperpendicular_constraint_refstangent_constraint_refsfixed_constraint_refssymmetry_constraint_refsequal_distance_constraint_refsequal_radius_constraint_refstableCoincidentConstraint{object_id:STRING;name:STRING;target_refs:[STRING];coincident_relation:INT;midpoint_constraint_refsaffine_transform_constraint_refsarray_constraint_refstableLogicalConstraintTable{object_id:STRING;coincident_constraint_refs:[STRING];parallel_constraint_refs:[STRING];perpendicular_constraint_refs:[STRING];tangent_constraint_refs:[STRING];fixed_constraint_refs:[STRING];symmetry_constraint_refs:[STRING];equal_distance_constraint_refs:[STRING];equal_radius_constraint_refs:[STRING];midpoint_constraint_refs:[STRING];affine_transform_constraint_refs:[STRING];array_constraint_refs:[STRING];}重合约束-用target_refstolerance用property_refstolerance:REAL;solver_status:INT;property_refs:[STRING];}平行约束-用target_refs用property_refstableParallelConstraint{object_id:STRING;name:STRING;target_refs:[STRING];orientation_mode:INT;angle_tolerance:REAL;solver_status:INT;property_refs:[STRING];}垂直约束符-用target_refs用property_refstablePerpendicularConstraint{object_id:STRING;name:STRING;target_refs:[STRING];angle_tolerance:REAL;solver_status:INT;property_refs:[STRING];}相切约束-用target_refscontact_point_ref-position_tolerance用property_refstableTangentConstraint{object_id:STRING;name:STRING;target_refs:[STRING];contact_point_ref:STRING;tangent_type:INT;angle_tolerance:REAL;position_tolerance:REAL;solver_status:INT;property_refs:[STRING];}固定约束-target_refsfixed_value_refsproperty_refstableFixedConstraint{object_id:STRING;name:STRING;target_refs:[STRING];fixed_position:BOOL;fixed_orientation:BOOL;fixed_parameter:BOOL;fixed_value_refs:[STRING];solver_status:INT;property_refs:[STRING];}对称约束-target_refsment_ref-tationtoleranceproperty_refstableSymmetryConstraint{object_id:STRING;name:STRING;target_refs:[STRING];symmetry_element_ref:STRING;symmetry_type:INT;tolerance:REAL;solver_status:INT;property_refs:[STRING];}等距约束-对property_refstableEqualDistanceConstraint{object_id:STRING;name:STRING;target_pairs:SEM;distance_tolerance:REAL;solver_status:INT;property_refs:[STRING];}等半径约束-target_refsradius_typeminorradius_toleranceproperty_refstableEqualRadiusConstraint{object_id:STRING;name:STRING;target_refs:[STRING];radius_type:INT;radius_tolerance:REAL;solver_status:INT;property_refs:[STRING];}中点约束-endpoint_refsmidpoint_ref-property_refstableMidpointConstraint{object_id:STRING;name:STRING;endpoint_refs:[STRING];midpoint_ref:STRING;distance_tolerance:REAL;solver_status:INT;property_refs:[STRING];}0仿射变换约束-用source_ref-target_ref--toleranceproperty_refstableAffineTransformConstraint{object_id:STRING;name:STRING;source_ref:STRING;target_ref:STRING;transform:SEM;tolerance:REAL;solver_status:INT;property_refs:[STRING];}1阵列约束-base_ref-member_refsurve,3=composite-用axis_ref-path_ref-transform_refstoleranceproperty_refstableArrayConstraint{object_id:STRING;name:STRING;base_ref:STRING;member_refs:[STRING];array_type:INT;count:INT;direction:Vec3d;spacing:REAL;axis_ref:STRING;angle_step:REAL;path_ref:STRING;transform_refs:[STRING];tolerance:REAL;solver_status:INT;property_refs:[STRING];}5.6.2尺寸约束-distance_constraint_refsangle_constraint_refsradius_constraint_refslength_constraint_refstableDimensionalConstraintTable{object_id:STRING;distance_constraint_refs:[STRING];angle_constraint_refs:[STRING];radius_constraint_refs:[STRING];length_constraint_refs:[STRING];}距离约束-target_refsunit_ref-property_refstableDistanceConstraint{object_id:STRING;name:STRING;target_refs:[STRING];distance:REAL;unit_ref:STRING;distance_tolerance:REAL;implicit_parallel:BOOL;solver_status:INT;property_refs:[STRING];}角度约束引-称target_refsreference_plane_ref--用unit_ref-差态property_refstableAngleConstraint{object_id:STRING;name:STRING;target_refs:[STRING];angle:REAL;reference_plane_ref:STRING;reference_normal:Vec3d;unit_ref:STRING;angle_tolerance:REAL;solver_status:INT;property_refs:[STRING];}半径约束-target_ref-radiusunit_ref-radius_toleranceproperty_refstableRadiusConstraint{object_id:STRING;name:STRING;target_ref:STRING;radius:REAL;radius_type:INT;unit_ref:STRING;radius_tolerance:REAL;solver_status:INT;property_refs:[STRING];}长度约束-target_ref-unit_ref-eproperty_refstableLengthConstraint{object_id:STRING;name:STRING;target_ref:STRING;length:REAL;length_type:INT;unit_ref:STRING;length_tolerance:REAL;solver_status:INT;property_refs:[STRING];}5.6.3方程及不等式约束-target_refsvariable_bindin系right_expressionproperty_refstableEquationInequalityConstraint{object_id:STRING;name:STRING;位置连续约束targettarget_refs:[STRING];variable_bindings:SEM;left_expression:STRING;operator:INT;right_expression:STRING;expression_tolerance:REAL;solver_status:INT;property_refs:[STRING];}5.6.4曲线连续性约束-position_continuity_constraint_refstangent_continuity_constraint_refsonstraint_refstableContinuityConstraintTable{object_id:STRING;position_continuity_constraint_refs:[STRING];tangent_continuity_constraint_refs:[STRING];curvature_continuity_constraint_refs:[STRING];}-用target_refs用connection_refsposition_tolerance用property_refstablePositionContinuityConstraint{object_id:STRING;name:STRING;target_refs:[STRING];connection_refs:[STRING];continuity_type:INT;position_tolerance:REAL;solver_status:INT;property_refs:[STRING];}切向连续约束-target_refsconnection_refsproperty_refstableTangentContinuityConstraint{object_id:STRING;name:STRING;target_refs:[STRING];connection_refs:[STRING];continuity_type:INT;scale_factor:REAL;angle_tolerance:REAL;solver_status:INT;property_refs:[STRING];}曲率连续约束-target_refsconnection_refseeproperty_refstableCurvatureContinuityConstraint{object_id:STRING;name:STRING;target_refs:[STRING];connection_refs:[STRING];continuity_type:INT;curvature_scale:REAL;curvature_tolerance:REAL;solver_status:INT;property_refs:[STRING];}5.6.5组合特征约束-parameter,3=hierarchicalnt_refs用target_refsule用parameter_refs用property_refstableCompositeConstraint{object_id:STRING;name:STRING;combination_type:INT;child_constraint_refs:[STRING];target_refs:[STRING];combination_rule:INT;parameter_refs:[STRING];semantic_label:STRING;expression:STRING;tolerance:REAL;solver_status:INT;property_refs:[STRING];}-simple_material