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Modeling Guide for 3D Objects - Part 1: Basics (Rules for Validating GML Geometries in CityGML) (view source)
Revision as of 13:41, 11 November 2013
, 13:41, 11 November 2013→gml:MultiSurface
== <span id="MultiSurface">[http://www.schemacentral.com/sc/niem21/e-gml32_MultiSurface.html gml:MultiSurface]</span> ==
== <span id="MultiSurface">[http://www.schemacentral.com/sc/niem21/e-gml32_MultiSurface.html gml:MultiSurface]</span> ==
A MultiSurface is an unstructured set <math>M=\lbrace S_1,S_2,...S_n\rbrace</math> of polygons. No further constraints are defined for a MultiSurface element. It is not necessary that M is a connected surface. Orientation of the polygons is arbitrary. By a MultiSurface any existing polygonal boundary representation of a rigid body can be described. Unfortunately, also objects that do not exist in real space can be modeled.
A MultiSurface is an unstructured set <math>M=\lbrace S_1,S_2,...S_n\rbrace</math> of polygons. No further constraints are defined for a MultiSurface element. It is not necessary that <math>M</math> is a connected surface. Orientation of the polygons is arbitrary. By a MultiSurface any existing polygonal boundary representation of a rigid body can be described. Unfortunately, also objects that do not exist in real space can be modeled.
Due to the missing constraints it is recommended that MultiSurface elements should only be used to model non-volumetric parts of the building model as shown in Figure 8. Volumetric parts should be modeled as solids (see gml:Solid)
Due to the missing constraints it is recommended that MultiSurface elements should only be used to model non-volumetric parts of the building model as shown in Figure 8. Volumetric parts should be modeled as solids (see gml:Solid)