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<p>This document specifies the integrated generic resource constructs for geometric and topological representation. The following are within the scope of this document:</p>
<p>The following are in the scope of the geometry schema:</p>
<ul>
<li>definition of points, vectors, parametric curves and parametric surfaces;</li>
<li>definition of finite volumes with internal parametrisation;</li>
<li>definition of transformation operators;</li>
<li>points defined directly by their coordinate values or in terms of the parameters of an existing curve or surface;</li>
<li>definition of conic curves and elementary surfaces;</li>
<li>definition of curves defined on a parametric surface;</li>
<li>definition of general parametric spline curves, surfaces and volumes;</li>
<li>definition of locally refined spline curves, surfaces and volumes;</li>
<li>definition of point, curve and surface replicas;</li>
<li>definition of offset curves and surfaces;</li>
<li>definition of intersection curves.</li>
</ul>
<p>The following are in the scope of the topology schema:</p>
<ul>
<li>definition of the fundamental topological entities vertex, edge, and face, each with a specialised subtype to enable it to be associated with the geometry of a point, curve, or surface, respectively;</li>
<li>collections of the basic entities to form topological structures of path, loop and shell and constraints to ensure the integrity of these structures;</li>
<li>the association of faces with geometric volumes;</li>
<li>orientation of topological entities.</li>
</ul>
<p>The following are in the scope of the geometric model schema:</p>
<ul>
<li>data describing the precise geometric form of three-dimensional solid</li>
<li>objects;</li>
<li>constructive solid geometry (CSG) models;</li>
<li>CSG models in two-dimensional space;</li>
<li>definition of CSG primitives and half-spaces;</li>
<li>creation of solid models by sweeping operations;</li>
<li>manifold boundary representation (B-rep) models;</li>
<li>constraints to ensure the integrity of B-rep models;</li>
<li>surface models;</li>
<li>wireframe models;</li>
<li>geometric sets;</li>
<li>creation of a replica of a solid model in a new location;</li>
<li>tessellated geometry;</li>
<li>the association of tessellated geometry with exact geometry.</li>
</ul>
<p>The following are in the scope of the scan data 3d shape model schema:</p>
<ul>
<li>representation of a shape as a cloud of points produced by a scanning process.</li>
</ul>
<p>The following are outside the scope of this document:</p>
<ul>
<li>all other forms of procedurally defined curves and surfaces;</li>
<li>curves and surfaces which do not have a parametric form of representation;</li>
<li>any form of explicit representation of a ruled surface.
<p class="note"><small>NOTE For a ruled surface the geometry is critically dependent upon the parametrisation of the boundary curves and the method of associating pairs of points on the two curves. A ruled surface with B-spline boundary curves can however be exactly represented by the B-spline surface entity.</small></p>
</li>
<li>spatial occupancy forms of solid models (such as octree models);</li>
<li>geometric tolerances;</li>
<li>implicit forms of representation in terms of features;</li>
<li>assemblies and mechanisms.</li>
</ul>
Reģistrācijas numurs (WIID)
91386
Darbības sfēra
<p>This document specifies the integrated generic resource constructs for geometric and topological representation. The following are within the scope of this document:</p>
<p>The following are in the scope of the geometry schema:</p>
<ul>
<li>definition of points, vectors, parametric curves and parametric surfaces;</li>
<li>definition of finite volumes with internal parametrisation;</li>
<li>definition of transformation operators;</li>
<li>points defined directly by their coordinate values or in terms of the parameters of an existing curve or surface;</li>
<li>definition of conic curves and elementary surfaces;</li>
<li>definition of curves defined on a parametric surface;</li>
<li>definition of general parametric spline curves, surfaces and volumes;</li>
<li>definition of locally refined spline curves, surfaces and volumes;</li>
<li>definition of point, curve and surface replicas;</li>
<li>definition of offset curves and surfaces;</li>
<li>definition of intersection curves.</li>
</ul>
<p>The following are in the scope of the topology schema:</p>
<ul>
<li>definition of the fundamental topological entities vertex, edge, and face, each with a specialised subtype to enable it to be associated with the geometry of a point, curve, or surface, respectively;</li>
<li>collections of the basic entities to form topological structures of path, loop and shell and constraints to ensure the integrity of these structures;</li>
<li>the association of faces with geometric volumes;</li>
<li>orientation of topological entities.</li>
</ul>
<p>The following are in the scope of the geometric model schema:</p>
<ul>
<li>data describing the precise geometric form of three-dimensional solid</li>
<li>objects;</li>
<li>constructive solid geometry (CSG) models;</li>
<li>CSG models in two-dimensional space;</li>
<li>definition of CSG primitives and half-spaces;</li>
<li>creation of solid models by sweeping operations;</li>
<li>manifold boundary representation (B-rep) models;</li>
<li>constraints to ensure the integrity of B-rep models;</li>
<li>surface models;</li>
<li>wireframe models;</li>
<li>geometric sets;</li>
<li>creation of a replica of a solid model in a new location;</li>
<li>tessellated geometry;</li>
<li>the association of tessellated geometry with exact geometry.</li>
</ul>
<p>The following are in the scope of the scan data 3d shape model schema:</p>
<ul>
<li>representation of a shape as a cloud of points produced by a scanning process.</li>
</ul>
<p>The following are outside the scope of this document:</p>
<ul>
<li>all other forms of procedurally defined curves and surfaces;</li>
<li>curves and surfaces which do not have a parametric form of representation;</li>
<li>any form of explicit representation of a ruled surface.
<p class="note"><small>NOTE For a ruled surface the geometry is critically dependent upon the parametrisation of the boundary curves and the method of associating pairs of points on the two curves. A ruled surface with B-spline boundary curves can however be exactly represented by the B-spline surface entity.</small></p>
</li>
<li>spatial occupancy forms of solid models (such as octree models);</li>
<li>geometric tolerances;</li>
<li>implicit forms of representation in terms of features;</li>
<li>assemblies and mechanisms.</li>
</ul>
