Here is a list of all struct and union fields with links to the structures/unions they belong to:

- u -

• u : _dwg_binary_chunk , _dwg_entity_eed_data , _dwg_EvalVariant , _dxf_pair
• u_isolines : _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_LOFTEDSURFACE , _dwg_entity_NURBSURFACE , _dwg_entity_PLANESURFACE , _dwg_entity_REVOLVEDSURFACE , _dwg_entity_SWEPTSURFACE
• UCS : _dwg_object_object
• ucs_at_origin : _dwg_entity_VIEWPORT , _dwg_object_VPORT
• UCS_CONTROL : _dwg_object_object
• UCS_CONTROL_OBJECT : _dwg_header_variables
• ucs_elevation : _dwg_entity_VIEWPORT , _dwg_object_LAYOUT , _dwg_object_UCS , _dwg_object_VIEW , _dwg_object_VPORT
• ucs_name : _dwg_entity_POINTCLOUD
• ucs_origin : _dwg_entity_POINTCLOUD , _dwg_entity_POINTCLOUDEX
• ucs_x_dir : _dwg_entity_POINTCLOUD , _dwg_entity_POINTCLOUDEX
• ucs_y_dir : _dwg_entity_POINTCLOUD , _dwg_entity_POINTCLOUDEX
• ucs_z_dir : _dwg_entity_POINTCLOUD , _dwg_entity_POINTCLOUDEX
• UCSBASE : _dwg_header_variables
• UCSFOLLOW : _dwg_object_VPORT
• UCSICON : _dwg_header_variables , _dwg_object_VPORT
• UCSNAME : _dwg_header_variables
• ucsorg : _dwg_entity_VIEWPORT
• UCSORG : _dwg_header_variables , _dwg_object_LAYOUT
• ucsorg : _dwg_object_UCS , _dwg_object_VIEW , _dwg_object_VPORT
• UCSORGBACK : _dwg_header_variables
• UCSORGBOTTOM : _dwg_header_variables
• UCSORGFRONT : _dwg_header_variables
• UCSORGLEFT : _dwg_header_variables
• UCSORGRIGHT : _dwg_header_variables
• UCSORGTOP : _dwg_header_variables
• UCSORTHOREF : _dwg_header_variables
• UCSORTHOVIEW : _dwg_entity_VIEWPORT , _dwg_header_variables , _dwg_object_LAYOUT , _dwg_object_UCS , _dwg_object_VIEW , _dwg_object_VPORT
• UCSVP : _dwg_entity_VIEWPORT , _dwg_object_VPORT
• ucsxdir : _dwg_entity_VIEWPORT
• UCSXDIR : _dwg_header_variables , _dwg_object_LAYOUT
• ucsxdir : _dwg_object_UCS , _dwg_object_VIEW , _dwg_object_VPORT
• ucsydir : _dwg_entity_VIEWPORT
• UCSYDIR : _dwg_header_variables , _dwg_object_LAYOUT
• ucsydir : _dwg_object_UCS , _dwg_object_VIEW , _dwg_object_VPORT
• ui_index : _dwg_LEADER_BlockLabel
• uncomp_size : _r2007_section_page
• unit1_name : _dwg_header_variables
• unit1_ratio : _dwg_header_variables
• unit2_name : _dwg_header_variables
• unit2_ratio : _dwg_header_variables
• unit3_name : _dwg_header_variables
• unit3_ratio : _dwg_header_variables
• unit4_name : _dwg_header_variables
• unit4_ratio : _dwg_header_variables
• unit_scale_horiz : _dwg_object_GEODATA
• unit_scale_vert : _dwg_object_GEODATA
• unit_type : _dwg_TABLE_value , _dwg_TABLESTYLE_rowstyles , _dwg_VALUEPARAM
• unitfactor : _dwg_entity_NAVISWORKSMODEL
• UNITMODE : _dwg_header_variables
• units : _dwg_object_RASTERVARIABLES
• units_value_horiz : _dwg_object_GEODATA
• units_value_vert : _dwg_object_GEODATA
• unknown : _dwg_AcDs_Data_RecordHdr , _dwg_AcDs_Search_Data , _dwg_CellContentGeometry , _dwg_DIMENSION_common , _dwg_entity_3DSOLID , _dwg_entity_ARC_DIMENSION , _dwg_entity_DIMENSION_ALIGNED , _dwg_entity_DIMENSION_ANG2LN , _dwg_entity_DIMENSION_ANG3PT , _dwg_entity_DIMENSION_DIAMETER , _dwg_entity_DIMENSION_LINEAR , _dwg_entity_DIMENSION_ORDINATE , _dwg_entity_DIMENSION_RADIUS , _dwg_entity_EXTRUDEDSURFACE , _dwg_entity_LARGE_RADIAL_DIMENSION , _dwg_entity_LOFTEDSURFACE , _dwg_entity_NURBSURFACE , _dwg_entity_PLANESURFACE , _dwg_entity_REVOLVEDSURFACE , _dwg_entity_SWEPTSURFACE , _dwg_MLEADER_Content_MText , _dwg_object_ACSH_BREP_CLASS , _dwg_object_APPID , _dwg_object_ASSOCASMBODYACTIONPARAM , _dwg_object_FIELDLIST , _dwg_object_IDBUFFER , _dwg_TABLE_Cell , _dwg_TableCell , _encrypted_section_header , _r2007_section , Dwg_Section_Info
• unknown1 : _dwg_object_GEODATA , _dwg_summaryinfo , r2007_file_header
• unknown2 : _dwg_object_GEODATA , _dwg_summaryinfo , r2007_file_header
• unknown3 : r2007_file_header
• unknown4 : r2007_file_header
• unknown5 : r2007_file_header
• unknown_0 : _dwg_header , _dwg_object_ASSOCPERSSUBENTMANAGER , _dwg_object_PERSUBENTMGR
• unknown_1 : _dwg_AcDs , _dwg_AcDs_DataBlob , _dwg_AcDs_DataBlobRef , _dwg_AcDs_Schema_Prop , _dwg_class , _dwg_PROXY_LWPOLYLINE , _dwg_security
• unknown_10 : _dwg_header_variables
• unknown_11 : _dwg_header_variables
• unknown_12 : _dwg_header_variables
• unknown_13 : _dwg_header_variables
• unknown_14 : _dwg_header_variables
• unknown_14b : _dwg_header_variables
• unknown_15 : _dwg_header_variables
• unknown_16 : _dwg_header_variables
• unknown_17 : _dwg_header_variables
• unknown_2 : _dwg_AcDs , _dwg_AcDs_DataBlob , _dwg_AcDs_DataBlobRef , _dwg_AcDs_Schema_Prop , _dwg_AcDs_Segment , _dwg_class , _dwg_object_ASSOCPERSSUBENTMANAGER , _dwg_object_PERSUBENTMGR , _dwg_PROXY_LWPOLYLINE , _dwg_security
• unknown_20 : _dwg_header_variables
• unknown_21 : _dwg_header_variables
• unknown_22 : _dwg_header_variables
• unknown_23 : _dwg_header_variables
• unknown_3 : _dwg_AcDs_Segment , _dwg_object_ASSOCPERSSUBENTMANAGER , _dwg_PROXY_LWPOLYLINE , _dwg_security
• unknown_4f2 : _dwg_header_variables
• unknown_5 : _dwg_header_variables
• unknown_51e : _dwg_header_variables
• unknown_520 : _dwg_header_variables
• unknown_52c : _dwg_header_variables
• unknown_52e : _dwg_header_variables
• unknown_530 : _dwg_header_variables
• unknown_54 : _dwg_header_variables
• unknown_55 : _dwg_header_variables
• unknown_56 : _dwg_header_variables
• unknown_57 : _dwg_header_variables
• unknown_59 : _dwg_header_variables
• unknown_5rl : _dwg_auxheader
• unknown_6 : _dwg_header_variables
• unknown_6a : _dwg_header_variables
• unknown_6b : _dwg_header_variables
• unknown_6c : _dwg_header_variables
• unknown_6rs : _dwg_auxheader
• unknown_8 : _dwg_header_variables
• unknown_9 : _dwg_header_variables
• unknown_b : _dwg_ColorRamp , _dwg_entity_TABLE , _dwg_object_GEODATA
• unknown_b0 : _dwg_entity_MTEXT
• unknown_b1 : _dwg_entity_MESH , _dwg_object_SECTIONVIEWSTYLE
• unknown_b2 : _dwg_entity_MESH , _dwg_object_SECTIONVIEWSTYLE
• unknown_b37 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bit_1 : _dwg_entity_LEADER
• unknown_bit_2 : _dwg_entity_LEADER
• unknown_bit_3 : _dwg_entity_LEADER
• unknown_bit_4 : _dwg_entity_LEADER
• unknown_bit_5 : _dwg_entity_LEADER
• unknown_bits : _dwg_appinfohistory , _dwg_object , _dwg_vbaproject
• unknown_bl : _dwg_ColorRamp , _dwg_entity_TABLE
• unknown_bl0 : _dwg_entity_POINTCLOUDEX
• unknown_bl1 : _dwg_entity_POINTCLOUDEX , _dwg_entity_TABLE , _dwg_object_TABLESTYLE
• unknown_bl10 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl11 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl12 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl13 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl14 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl15 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl16 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl17 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl18 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl19 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl2 : _dwg_object_TABLESTYLE
• unknown_bl20 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl21 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl22 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl23 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl24 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl25 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl26 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl27 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl28 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl29 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl3 : _dwg_object_TABLESTYLE
• unknown_bl30 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl31 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl32 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl33 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl34 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl35 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl36 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl6 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl6a : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl7 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl7a : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl8 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bl9 : _dwg_object_ASSOCPERSSUBENTMANAGER
• unknown_bool : _dwg_object_BLOCKVISIBILITYPARAMETER
• unknown_bs : _dwg_entity_TABLE
• unknown_day : _dwg_header_variables
• UNKNOWN_ENT : _dwg_object_entity
• unknown_h : _dwg_entity_TABLE
• unknown_hour : _dwg_header_variables
• unknown_long : _dwg_R2004_Header
• unknown_min : _dwg_header_variables
• unknown_mon : _dwg_header_variables
• unknown_ms : _dwg_header_variables
• UNKNOWN_OBJ : _dwg_object_object
• unknown_r11 : _dwg_entity_LINE , _dwg_object_BLOCK_HEADER , _dwg_object_LTYPE , _dwg_object_VIEW
• unknown_r2 : _dwg_object_VIEW
• unknown_rc : _dwg_entity_TABLE , _dwg_object_TABLESTYLE
• unknown_rest : _dwg_object
• unknown_sec : _dwg_header_variables
• unknown_short : _dwg_entity_TOLERANCE
• unknown_short_1 : _dwg_entity_LEADER
• unknown_string : _dwg_header_variables
• unknown_t : _dwg_object_BLOCKLOOKUPPARAMETER
• unknown_year : _dwg_header_variables
• unnamed : _dwg_object_GROUP
• UNUSED : _dwg_object_entity
• up_dir : _dwg_object_GEODATA
• upd_basept : _dwg_object_BLOCKALIGNEDCONSTRAINTPARAMETER , _dwg_object_BLOCKALIGNMENTPARAMETER , _dwg_object_BLOCKANGULARCONSTRAINTPARAMETER , _dwg_object_BLOCKDIAMETRICCONSTRAINTPARAMETER , _dwg_object_BLOCKFLIPPARAMETER , _dwg_object_BLOCKHORIZONTALCONSTRAINTPARAMETER , _dwg_object_BLOCKLINEARCONSTRAINTPARAMETER , _dwg_object_BLOCKLINEARPARAMETER , _dwg_object_BLOCKPOLARPARAMETER , _dwg_object_BLOCKRADIALCONSTRAINTPARAMETER , _dwg_object_BLOCKROTATIONPARAMETER , _dwg_object_BLOCKVERTICALCONSTRAINTPARAMETER , _dwg_object_BLOCKXYPARAMETER
• upd_endpt : _dwg_object_BLOCKALIGNEDCONSTRAINTPARAMETER , _dwg_object_BLOCKALIGNMENTPARAMETER , _dwg_object_BLOCKANGULARCONSTRAINTPARAMETER , _dwg_object_BLOCKDIAMETRICCONSTRAINTPARAMETER , _dwg_object_BLOCKFLIPPARAMETER , _dwg_object_BLOCKHORIZONTALCONSTRAINTPARAMETER , _dwg_object_BLOCKLINEARCONSTRAINTPARAMETER , _dwg_object_BLOCKLINEARPARAMETER , _dwg_object_BLOCKPOLARPARAMETER , _dwg_object_BLOCKRADIALCONSTRAINTPARAMETER , _dwg_object_BLOCKROTATIONPARAMETER , _dwg_object_BLOCKVERTICALCONSTRAINTPARAMETER , _dwg_object_BLOCKXYPARAMETER
• upd_state : _dwg_object_BLOCKFLIPGRIP
• update_option : _dwg_object_DATALINK
• update_status : _dwg_object_DATALINK
• upper_right : _dwg_object_VPORT
• uprops : _dwg_AcDs_SchemaData
• use_attenuation_limits : _dwg_entity_LIGHT
• use_block_rotation : _dwg_object_MLEADERSTYLE
• use_block_scale : _dwg_object_MLEADERSTYLE
• use_default_lights : _dwg_entity_VIEWPORT , _dwg_object_VIEW , _dwg_object_VPORT
• use_lut_palette : _dwg_object_TVDEVICEPROPERTIES
• use_subset : _dwg_object_SUNSTUDY
• use_tiling : _dwg_object_IMAGE_BACKGROUND
• used : _dwg_object_APPID , _dwg_object_BLOCK_HEADER , _dwg_object_DIMSTYLE , _dwg_object_LAYER , _dwg_object_LTYPE , _dwg_object_STYLE , _dwg_object_UCS , _dwg_object_VIEW , _dwg_object_VPORT , _dwg_object_VX_TABLE_RECORD
• user_scale_factor : _dwg_object_GEODATA
• user_text : _dwg_DIMENSION_common , _dwg_entity_ARC_DIMENSION , _dwg_entity_DIMENSION_ALIGNED , _dwg_entity_DIMENSION_ANG2LN , _dwg_entity_DIMENSION_ANG3PT , _dwg_entity_DIMENSION_DIAMETER , _dwg_entity_DIMENSION_LINEAR , _dwg_entity_DIMENSION_ORDINATE , _dwg_entity_DIMENSION_RADIUS , _dwg_entity_LARGE_RADIAL_DIMENSION
• USERI1 : _dwg_header_variables
• USERI2 : _dwg_header_variables
• USERI3 : _dwg_header_variables
• USERI4 : _dwg_header_variables
• USERI5 : _dwg_header_variables
• USERR1 : _dwg_header_variables
• USERR2 : _dwg_header_variables
• USERR3 : _dwg_header_variables
• USERR4 : _dwg_header_variables
• USERR5 : _dwg_header_variables
• USRTIMER : _dwg_header_variables
• uvec : _dwg_entity_IMAGE , _dwg_entity_WIPEOUT
• uvec1 : _dwg_entity_NURBSURFACE
• uvec2 : _dwg_entity_NURBSURFACE