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IfcMaterialUsageDefinition: Illegal to assign to subtype of IfcElementType

1. A by Arv on 15 Nov 2022, edited 16 Nov 2022 #

   buildingsmart documentation mentions IfcMaterialUsageDefinition for occurrence specific assignment and mentions as illegal to assign its subtype to a subtype of IfcElementType. Demo library has for example IfcSlabType defined with IfcMaterialLayerSetUsage. Confused on this now. Could anyone clarify on this point.

2. T by theoryshaw on 15 Nov 2022, edited 15 Nov 2022 #

   Not an expert... but...

   The IFCMATERIALLAYERSET is assigned to the IFCSLABTYPE.

   The IFCMATERIALLAYERSET is assigned to IFCMATERIALLAYERSETUSAGE

   IFCMATERIALLAYERSETUSAGE is assigned to IFCSLAB

   This is output from BB's demo library....

   
   #63=IFCRELASSOCIATESMATERIAL('3WSlLxuwH3Sfsul8DwR0LU',$,$,$,(#62),#66);
   
     /*#62=IFCSLABTYPE('0OWxf_nd97uvH$Sr4QbAVW',$,'DEMO150',$,$,$,$,$,$,$);*/
   
     /*#66=IFCMATERIALLAYERSET((#65),$,$);*/
   
       /*#65=IFCMATERIALLAYER(#64,0.2,$,$,$,$,$);*/
   
         /*#64=IFCMATERIAL('Unknown',$,$);*/
   

   
   #69=IFCRELDEFINESBYTYPE('3_M2mlner70e8MuV67bELe',$,$,$,(#67),#62);
   
     /*#67=IFCSLAB('1WC$r91LfEmBg1ASSVBC8$',$,'Slab',$,$,#76,#83,$,.NOTDEFINED.);*/
   
       /*#76=IFCLOCALPLACEMENT(#61,#75);*/
   
         /*#61=IFCLOCALPLACEMENT(#55,#60);*/
   
           /*#55=IFCLOCALPLACEMENT(#49,#54);*/
   
             /*#49=IFCLOCALPLACEMENT($,#48);*/
   
               /*#48=IFCAXIS2PLACEMENT3D(#45,#46,#47);*/
   
                 /*#45=IFCCARTESIANPOINT((0.,0.,0.));*/
   
                 /*#46=IFCDIRECTION((0.,0.,1.));*/
   
                 /*#47=IFCDIRECTION((1.,0.,0.));*/
   
             /*#54=IFCAXIS2PLACEMENT3D(#51,#52,#53);*/
   
               /*#51=IFCCARTESIANPOINT((0.,0.,0.));*/
   
               /*#52=IFCDIRECTION((0.,0.,1.));*/
   
               /*#53=IFCDIRECTION((1.,0.,0.));*/
   
           /*#60=IFCAXIS2PLACEMENT3D(#57,#58,#59);*/
   
             /*#57=IFCCARTESIANPOINT((0.,0.,0.));*/
   
             /*#58=IFCDIRECTION((0.,0.,1.));*/
   
             /*#59=IFCDIRECTION((1.,0.,0.));*/
   
         /*#75=IFCAXIS2PLACEMENT3D(#72,#73,#74);*/
   
           /*#72=IFCCARTESIANPOINT((1.,1.,-0.200000002980232));*/
   
           /*#73=IFCDIRECTION((0.,0.,1.));*/
   
           /*#74=IFCDIRECTION((1.,0.,0.));*/
   
       /*#83=IFCPRODUCTDEFINITIONSHAPE($,$,(#82));*/
   
         /*#82=IFCSHAPEREPRESENTATION(#15,'Body','SweptSolid',(#81));*/
   
           /*#15=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Model',*,*,*,*,#14,$,.MODEL_VIEW.,$);*/
   
             /*#14=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.E-05,#13,$);*/
   
               /*#13=IFCAXIS2PLACEMENT3D(#10,#11,#12);*/
   
                 /*#10=IFCCARTESIANPOINT((0.,0.,0.));*/
   
                 /*#11=IFCDIRECTION((0.,0.,1.));*/
   
                 /*#12=IFCDIRECTION((1.,0.,0.));*/
   
           /*#81=IFCEXTRUDEDAREASOLID(#80,$,#79,0.2);*/
   
             /*#80=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#78);*/
   
               /*#78=IFCINDEXEDPOLYCURVE(#77,$,$);*/
   
                 /*#77=IFCCARTESIANPOINTLIST3D(((0.,0.),(1.,0.),(1.,1.),(0.,1.),(0.,0.)));*/
   
             /*#79=IFCDIRECTION((0.,0.,1.));*/
   
     /*#62=IFCSLABTYPE('0OWxf_nd97uvH$Sr4QbAVW',$,'DEMO150',$,$,$,$,$,$,$);*/
   

   
   #71=IFCRELASSOCIATESMATERIAL('0ELwhNK7XBz9y7BE6Zg6i2',$,$,$,(#67),#70);
   
     /*#67=IFCSLAB('1WC$r91LfEmBg1ASSVBC8$',$,'Slab',$,$,#76,#83,$,.NOTDEFINED.);*/
   
       /*#76=IFCLOCALPLACEMENT(#61,#75);*/
   
         /*#61=IFCLOCALPLACEMENT(#55,#60);*/
   
           /*#55=IFCLOCALPLACEMENT(#49,#54);*/
   
             /*#49=IFCLOCALPLACEMENT($,#48);*/
   
               /*#48=IFCAXIS2PLACEMENT3D(#45,#46,#47);*/
   
                 /*#45=IFCCARTESIANPOINT((0.,0.,0.));*/
   
                 /*#46=IFCDIRECTION((0.,0.,1.));*/
   
                 /*#47=IFCDIRECTION((1.,0.,0.));*/
   
             /*#54=IFCAXIS2PLACEMENT3D(#51,#52,#53);*/
   
               /*#51=IFCCARTESIANPOINT((0.,0.,0.));*/
   
               /*#52=IFCDIRECTION((0.,0.,1.));*/
   
               /*#53=IFCDIRECTION((1.,0.,0.));*/
   
           /*#60=IFCAXIS2PLACEMENT3D(#57,#58,#59);*/
   
             /*#57=IFCCARTESIANPOINT((0.,0.,0.));*/
   
             /*#58=IFCDIRECTION((0.,0.,1.));*/
   
             /*#59=IFCDIRECTION((1.,0.,0.));*/
   
         /*#75=IFCAXIS2PLACEMENT3D(#72,#73,#74);*/
   
           /*#72=IFCCARTESIANPOINT((1.,1.,-0.200000002980232));*/
   
           /*#73=IFCDIRECTION((0.,0.,1.));*/
   
           /*#74=IFCDIRECTION((1.,0.,0.));*/
   
       /*#83=IFCPRODUCTDEFINITIONSHAPE($,$,(#82));*/
   
         /*#82=IFCSHAPEREPRESENTATION(#15,'Body','SweptSolid',(#81));*/
   
           /*#15=IFCGEOMETRICREPRESENTATIONSUBCONTEXT('Body','Model',*,*,*,*,#14,$,.MODEL_VIEW.,$);*/
   
             /*#14=IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.E-05,#13,$);*/
   
               /*#13=IFCAXIS2PLACEMENT3D(#10,#11,#12);*/
   
                 /*#10=IFCCARTESIANPOINT((0.,0.,0.));*/
   
                 /*#11=IFCDIRECTION((0.,0.,1.));*/
   
                 /*#12=IFCDIRECTION((1.,0.,0.));*/
   
           /*#81=IFCEXTRUDEDAREASOLID(#80,$,#79,0.2);*/
   
             /*#80=IFCARBITRARYCLOSEDPROFILEDEF(.AREA.,$,#78);*/
   
               /*#78=IFCINDEXEDPOLYCURVE(#77,$,$);*/
   
                 /*#77=IFCCARTESIANPOINTLIST3D(((0.,0.),(1.,0.),(1.,1.),(0.,1.),(0.,0.)));*/
   
             /*#79=IFCDIRECTION((0.,0.,1.));*/
   
     /*#70=IFCMATERIALLAYERSETUSAGE(#66,.AXIS3.,.POSITIVE.,0.,$);*/
   
       /*#66=IFCMATERIALLAYERSET((#65),$,$);*/
   
         /*#65=IFCMATERIALLAYER(#64,0.2,$,$,$,$,$);*/
   
           /*#64=IFCMATERIAL('Unknown',$,$);*/
   

3. A by Arv on 16 Nov 2022, edited 16 Nov 2022 #

   Thanks @theoryshaw . clear on this now. always had a confusion between ifcmateriallayersetusage and ifcmateriallayerset

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