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Surface MeshMModule - Surface
(0066,0001) Number of Surfaces1Unsigned Long
(0066,0002) Surface Sequence1Sequence
(0062,0003) Segmented Property Category Code Sequence3Sequence
(0062,000C) Recommended Display Grayscale Value1Unsigned Short
(0062,000D) Recommended Display CIELab Value1Unsigned Short
(0062,000F) Segmented Property Type Code Sequence3Sequence
(0066,0003) Surface Number1Unsigned Long
(0066,0004) Surface Comments3Long Text
(0066,0009) Surface Processing2Code String
(0066,000A) Surface Processing Ratio2CSingle
(0066,000B) Surface Processing Description3Long String
(0066,000C) Recommended Presentation Opacity1Single
(0066,000D) Recommended Presentation Type1Code String
(0066,000E) Finite Volume1Code String
(0066,0010) Manifold1Code String
(0066,0011) Surface Points Sequence1Sequence
(0066,0012) Surface Points Normals Sequence2Sequence
(0066,0013) Surface Mesh Primitives Sequence1Sequence
(0066,0026) Triangle Strip Sequence2Sequence
(0066,0040) Long Primitive Point Index List1OL
(0066,0027) Triangle Fan Sequence2Sequence
(0066,0028) Line Sequence2Sequence
(0066,0034) Facet Sequence2Sequence
(0066,0041) Long Triangle Point Index List2OL
(0066,0042) Long Edge Point Index List2OL
(0066,0043) Long Vertex Point Index List2OL
(0066,0035) Surface Processing Algorithm Identification Sequence2CSequence
(0066,0037) Recommended Point Radius3Single
(0066,0038) Recommended Line Thickness3Single
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Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 12 May 2020. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Long Primitive Point Index List Attribute

Tag(0066,0040)
TypeRequired (1)
KeywordLongPrimitivePointIndexList
Value Multiplicity1
Value RepresentationOL

A list of point indices. See Section C.27.4.1.

Section C.27.4.1

C.27.4.1 Surface Mesh Primitives Macro Attribute Descriptions

The Surface Mesh Primitives Macro uses 32-bit long integer point indices to reference the point rather than repeating point coordinates. All of the point coordinates used are specified within the Surface Points Sequence (0066,0011) of the same Surface Sequence (0066,0002) Item. Point indices are described in Section C.27.2.1.1.

Note

In a previous edition, other Attributes were used that had an OW VR and a limitation to no more than 65535 points per surface. These have been retired and replaced with new Attributes. See PS 3.3 2014a.

A Surface Mesh shall contain one or more of the following primitive types:

Vertex

A single Vertex, referencing a single point

Edge

An Edge, referencing two points

Line

A series of connected points describing a path

Triangle

A Triangle, referencing three points:

Triangle Strip

A Triangle Strip with n triangles, referencing n+2 points. The first three referenced points describe the first triangle, the second, third and fourth referenced points describe the second triangle.

Triangle Fan

A Triangle Fan with n triangles, referencing n+2 points. The first referenced point is in the center of the fan. Together with two subsequent referenced points, it describes a complete triangle.

Facet

A closed planar polygon, referencing n points. The final point in the point index list shall be connected to the first point in the point index list to close the facet.

If the Surface Points Normals Sequence (0066,0012) is not present, the default normals can be derived from the Surface Mesh Primitives.

For the Triangle Strip, Triangle Fan and Facet the Long Primitive Point Index List (0066,0040) the ordering of the point references implies the direction of the primitive's normal: The normal points in the direction from which the referenced points are specified in a counterclockwise order. For finite volumes this shall be the outward direction.

For the Line primitive, the ordering of the point references defines a directed path, starting with the first point and ending with the last point referenced in each Long Primitive Point Index List (0066,0040).

For Primitives of type Triangle Strip or Triangle Fan, the orientation of the normals is given by the order of the points in the first triangle.

Note

These points may be used to compute normals to the primitive. (see Section C.27.1.1.6.) The order these point references are presented in the Long Primitive Point Index List (0066,0040) will affect the direction the computed normal points. If the order of the point references is reversed, the direction of the normals will be reversed as well.