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<h5 class="std">4.10.2.3.1 Surface 3D Geometry</h5>
<p>The <i>Surface 3D Geometry</i> is the standard surfacic represenation for elements having a 'Surface' representation describing the
 inner or outer surface of the object, e.g. for defining thermal boundaries idealized at the middle plane of an element.

</p>

<p>The following attribute values for the
 <a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a> holding this geometric
 representation shall be used:</p>

<ul>
 
<li><a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a><i>.RepresentationIdentifier</i> =
'Surface'</li>


 
<li><a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a><i>.RepresentationType</i> =
'Surface3D'</li>


 
<li><a href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm">IfcShapeRepresentation</a><i>.Items</i> =
 <a href="../ifcgeometryresource/lexical/ifcboundedsurface.htm">IfcBoundedSurface</a>, <a href="../ifcgeometryresource/lexical/ifcsweptsurface.htm">IfcSweptSurface</a></li>

</ul>
<p>Figure 45 illustrates an instance diagram.</p>
<table><tr><td><img alt="Surface 3D Geometry" src="diagrams/surface-3d-geometry.png" usemap="#f45"><map name="f45"><area shape="rect" coords="8,8,176,392" href="../ifcproductextension/lexical/ifcelement.htm" alt="IfcElement"><area shape="rect" coords="208,8,376,80" href="../ifcrepresentationresource/lexical/ifcproductdefinitionshape.htm" alt="IfcProductDefinitionShape"><area shape="rect" coords="408,8,576,116" href="../ifcrepresentationresource/lexical/ifcshaperepresentation.htm" alt="IfcShapeRepresentation"><area shape="rect" coords="608,8,776,116" href="../ifcrepresentationresource/lexical/ifcgeometricrepresentationcontext.htm" alt="IfcGeometricRepresentationContext"><area shape="rect" coords="608,128,776,140" href="../ifcmeasureresource/lexical/ifclabel.htm" alt="IfcLabel"><area shape="rect" coords="608,152,776,164" href="../ifcmeasureresource/lexical/ifclabel.htm" alt="IfcLabel"><area shape="rect" coords="608,176,776,212" href="../ifcgeometryresource/lexical/ifcboundedsurface.htm" alt="IfcBoundedSurface"><area shape="rect" coords="608,224,776,284" href="../ifcgeometryresource/lexical/ifcsweptsurface.htm" alt="IfcSweptSurface"></map></td></tr><tr><td><p class="figure">Figure 45 &mdash; Surface 3D Geometry</p></td></tr></table>

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