1、1 INTERNATIONAL STANDARD ISO 10303-111:2007 TECHNICAL CORRIGENDUM 2 Published 2014-0 7-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION Industrial automation systems and integration Product data representation and exchange Part 111: Integrated generic re
2、source: Elements for the procedural modelling of solid shapes TECHNICAL CORRIGENDUM 2 industrielle Reprsentation et change de donnes de produits - Partie 111 Ressources gnriques intgres: lments pour la modlisation procdurale des forms solides RECTIFICATIF TECHNIQUE 2 Technical Corrigendum 2 to Inter
3、national Standard ISO 10303-111:2007 was prepared by Technical Committee ISO/TC 184, Automation systems and integration, Subcommittee SC 4, Industrial data. This Technical Corrigendum is intended to be used in conjunction with ISO 10303-111:2007/Cor.1:2008. The purpose of the modifications to the te
4、xt of ISO 10303-111:2007 is to make minor changes in the information model to avoid an implementation problem ICS 25.040.40 Ref. No. ISO 10303-111:2007/Cor.2:2014(E) ISO 2014 All rights reserved Published in Switzerland ISO10303-111: 2007/Cor.2:2014(E) ModicationstothetextofISO10303-111:2007 Clause4
5、.4.2,edge_blended_solid,pp. 11-12 Replace the EXPRESS code on p. 12 with the following, in which solid_with_variable_radius_edge_- blend has been removed from the SUPERTYPE OF list: EXPRESS specication: * ) ENTITY edge_blended_solid ABSTRACT SUPERTYPE OF (track_blended_solid ANDOR (ONEOF (solid_with
6、_constant_radius_edge_blend, solid_with_chamfered_edges) SUBTYPE OF (modified_solid); blended_edges : LIST 1:? OF UNIQUE edge_curve; END_ENTITY; ( * Clause4.4.3,track_blended_solid,pp. 12-13 Replacetheentireentitydenitionbythefollowing,inwhichtheEXPRESScodeandthedescriptivetext have been amended: A
7、track_blended_solid is a type of edge_blended_solid in which the edges to be blended form a con- tinuousopenorclosedtrack. A WHERE ruleisimposedtoensurethiscondition. NOTE1 A track is related to a path as dened in ISO 10303-42 in that it consists of a list of distinct edges connectedendtoendsothatit
8、ispossibletotraversealltheedgesinthelistcontinuouslyfromaninitialvertexto a nal vertex. The initial and nal vertices may be the same in the case of a closed track. The difference is that a path consists of instances of oriented_edge, so that there is a sense associated with the path as a whole. A tr
9、ack, bycontrast,ismadeupofunorientededges. NOTE2 Whereappropriate,this ABSTRACT entitymaybeinstantiatedasacomplexinstancewithsolid_with_- constant_radius_edge_blendorsolid_with_chamfered_edges. NOTE3 Figure 4 in clause 4.4.5 shows an example of a track_blended_solid, in which the blended track is a
10、sequence of ve edges of the volume created by extruding a rectangle with two rounded corners. Since the blend is a constant radius blend, this solid can be represented by a complex instance of track_blended_solid and solid_with_constant_radius_edge_blend. EXPRESS specication: * ) ENTITY track_blende
11、d_solid ABSTRACT SUPERTYPE SUBTYPE OF (edge_blended_solid); WHERE WR1: check_continuous_edges(SELFedge_blended_solid.blended_edges); END_ENTITY; ( * 2 c ISO 2014AllrightsreservedISO10303-111: 2007/Cor.2:2014(E) Formalpropositions: WR1: One vertex of each member of the list of edge_curve instances (e
12、xcept the last instance, in the caseofanopentrack)shallbeidenticalwithonevertexofthefollowingmember. Clause4.4.6,solid_with_variable_radius_edge_blend,pp. 17-19 Replace the descriptive text and the EXPRESS code of this clause by the following, in which edge_- blended_solidhasbeenremovedfromtheSUPERT
13、YPEOFlistintheEXPRESScodeandthedescriptive text has been amended accordingly: Asolid_with_variable_radius_edge_blendisatypeoftrack_blended_solidinwhichdifferentradius values are specied at selected points of each of the edges concerned, and a specied interpolation methodisusedtocomputeblendradiusval
14、uesatintermediatepoints. As stated in clause 4.4.5, the geometry of the transferred blend is assumed to be of the rolling ball type, thoughinthiscasetheradiusoftheballvariesduringitsmotion. NOTE 1 The note in clause 4.4.5 concerning differences in the geometric interpretation of rolling ball edge bl
15、endsappliesforthisentityalso. Since this entity is a subtype of track_blended_solid, the edges blended are required to be joined end- to-end in an open or closed track. The correct correspondence of the specied radius-dening points with the edges concerned may therefore be ensured (see the formal an
16、d informal propositions applying to this entity). If specialized end conditions are imposed on the blend, the entity shall be instantiated as a complex instance with track_blended_solid_with_end_conditions. If any edge is required to have a constant radius blend, even though the track blend as a who
17、le has a variable radius, then that edge shall be treated as an edge with linear variation of blend radius, with the same radius value being specied at eachofitsendpoints. NOTE2 Figure6showsavariableradiustrackblendwithoneconstantradiusblendsegment. Ingeneral,thepositionsofterminalverticesofedgesint
18、helistmayormaynotbeusedasradius-dening points. Iftrack_blended_solid_with_end_conditionsisnotinstantiated,thepositionsofthestartvertex oftherstedgeofthelistandtheendvertexofthelastedgeofthelistshallalwaysbedenedasselected points. NOTE 3 A single connected track of edges can be blended by an instance
19、 of this entity. The variable radius blendingofmoregeneralnetworksofedgeswillrequiretheuseofsuccessivemultipleinstances. Inanyintervalwhoseradius-deningfunctioniscubic,theactualfunctionisdeterminedusingHermite interpolation, in terms of the radii at each end point of the interval and values of the r
20、st derivatives of theradiusvariationfunctionatthoseendpoints. NOTE 4 Appropriate values of the required derivatives can be determined from the radius values at the end- pointsusingstandardmethodsforthecomputationofnaturalcubicsplinefunctions5. Thedetailsdifferslightly forthecasesofopenandclosededget
21、racks. NOTE 5 In any interval for which the value of the radius-dening function is unspecied it is recommended that linear interpretation is used initially in the receiving system but that the user is warned that some other native blendingcapabilityofthatsystemmaybemoreappropriate. c ISO 2014Allrigh
22、tsreserved 3ISO10303-111: 2007/Cor.2:2014(E) NOTE 6 Figure 5 shows the L-shaped block of Figure 2 after creation of a variable radius blend on its concave edge. Inthisexampletheblendradiusvarieslinearlyalongthelengthoftheedgeconcerned. NOTE7 Figure6showsanexampleofatrack_blended_solid_with_end_condi
23、tionsasdenedinclause4.4.4, in which the blended track is a sequence of ve edges of a volume created by extruding a rectangle with two rounded corners. The blend is a variable radius blend. This solid can be represented by a complex instance of solid_with_variable_radius_edge_blendandtrack_blended_so
24、lid_with_end_conditions. EXPRESS specication: * ) ENTITY solid_with_variable_radius_edge_blend SUBTYPE OF (track_blended_solid); point_list : LIST2:? OF point; radius_list : LIST2:? OF positive_length_measure; edge_function_list : LIST1:? OF blend_radius_variation_type; WHERE WR1: SIZEOF(point_list)
25、 = SIZEOF(radius_list); WR2: SIZEOF(edge_function_list) = SIZEOF(radius_list) - 1; WR3: NOT(point_list1 = point_listHIINDEX(point_list) AND NOT (radius_list1 = radius_listHIINDEX(radius_list); END_ENTITY; ( * AnnexB,p. 77 ThechangesmadeinthisTechnicalCorrigendumrequiretheobjectidentiersinAnnexBtobeu
26、pdated. Replace the content of clause B.1 with the following: Toprovideforunambiguousidenticationofaninformationobjectinanopensystem,theobjectidenti- er iso standard 10303 part(111) version(3) is assigned to this part of ISO 10303. The meaning of this value is dened in ISO/IEC 8824-1, and is describ
27、edinISO10303-1. Replace the content of clause B.2 with the following: To provide for unambiguous identication of the solid-shape-element-schema in an open information system,theobjectidentier iso standard 10303 part(111) version(3) schema(1) solid-shape-element-schema(1) is assigned to the solid_sha
28、pe_element_schema (see clause 1). The meaning of this value is dened in ISO/IEC8824-1,andisdescribedinISO10303-1. AppendixD,FigureD.3,p. 82 Replace the Figure by the one on the following page, which reects the previously specied changes in the information model: 4 c ISO 2014AllrightsreservedISO10303-111: 2007/Cor.2:2014(E) FigureD.3solid_shape_element_schemaEXPRESS-Gdiagram3of11 c ISO 2014Allrightsreserved 5
