Geometry_section_surface
Contents
Data Structure: Geometry_section_surface |
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Description |
Defines data to split surfaces with a surface section |
Usage |
Geometry_section_surface NUM=ival where ival is the data structure number |
Description |
Overview Defines data create a section through a 3-D model that may be used to (see Generation_type): •Generate section data and create a 2-D .geo and .dat file ('Section') •Add section geometry to a 3-D model by splitting current volumes ('Add_geometry') •Split a 3-D model removing geometry on one side of the section defined by Split_geomety_flag ('Split')
The section type ( Section_type) may be defined as: •"XY_plane" - a flat surface aligned to the X-Y plane at the reference Z-ordinate defined using Reference_location •"YZ_plane" - a flat surface aligned to the Y-Z plane at the reference X-ordinate defined using Reference_location •"ZX_plane" - a flat surface aligned to the X-Z plane at the reference Y-ordinate defined using Reference_location •"XY_local" - a flat plane aligned to the X-Y plane of the assigned coordinate system and passing through the reference location •"YZ_local" - a flat plane aligned to the X-Y plane of the assigned coordinate system and passing through the reference location •"ZX_local" - a flat plane aligned to the X-Y plane of the assigned coordinate system and passing through the reference location •"XY_path" - a vertical section along a non-flat X-Y path defined via Path_coordinates.
For flat plane Reference coordinates for the section surface are defined using Reference_location, whereas for section type "XY_path" the path is defined using Path_coordinates.
A list of formation units, element groups or volumes may be defined rather than applying the section to the complete model; e.g. for creation of a 2-D model containing a limited selection of formation units. The section may also be limited in lateral extent by specifying the Section_length. In this case the section is assumed to start at either the Reference_location , or the first point on the Path_coordinates.
The orientation of the section is set automatically and can be reversed if required by specifying the Section_reversal_flag. |
 | Section_type Type of section |
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The valid Section_type settings are: • "XY_plane" - a flat surface aligned to the XY plane at the reference Z ordinate defined using Reference_location • "YZ_plane" - a flat surface aligned to the YZ plane at the reference X ordinate defined using Reference_location • "ZX_plane" - a flat surface aligned to the XZ plane at the reference Y ordinate defined using Reference_location • "XY_local" - a flat plane aligned to the XY plane of the assigned coordinate system and passing through the reference_location • "YZ_local" - a flat plane aligned to the YX plane of the assigned coordinate system and passing through the reference_location • "ZX_local" - a flat plane aligned to the ZX plane of the assigned coordinate system and passing through the reference_location • "XY_path" - a vertical section along a non-flat XY path defined via Path_coordinates.
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| Generation_type Type of section generation |
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Type of section generation. Valid values are: • "Section" - Generate section data and create a 2D .geo and .dat file • "Add_geometry" - Add section geometry to a 3D model by splitting current volumes • "Split" - Split a 3D model removing geometry on one side of the section defined by Split_geomety_flag
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| Split_geometry_flag Flag defing section is being used to split a 3-D model |
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Flag defing section is being used to split a 3-D model. Valid values are: • 0 - No split • 1 - Split retaining the model on +ve side of the section • 2 - Split retaining the model on - ve side of the section
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| Reference_location Ordinate or coordinates of reference point |
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Reference coordinates for the section surface is dependent on the section type. The required values are: Valid labels are: •Section type "XY_plane" - Z-ordinate of any point on the plane •Section type "YZ_plane" - X-ordinate of any point on the plane •Section type "ZX_plane" - Y-Ordinate of any point on the plane •Section type "XY_local" - Z-ordinate of any point on the plane •Section type "YZ_local" - X-ordinate of any point on the plane •Section type "ZX_local" - Y-ordinate of any point on the plane •Section type "XY_path" - not required
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| Path_coordinates Path coordinates |
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Coordinates of points defining the X-Y path for the section surface.
Notes •The path coordinates may also be imported from a file defined via Path_filename
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| Path_filename File name containing path coordinates |
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File name containing path coordinates.
Notes •The path coordinates may also be imported from a file defined via Path_filename. The format of the file is:
* Path_coordinates IDM = ival JDM = jval where ival =NPTDIM 2 jval =NPTPTH Number of points defining path
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| Units List of unit names (Compulsory) |
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List of stratigraphy unit names to be considered (default all units)
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| Group_numbers List of element group numbers for surface section operation (optional) |
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List of element groups by number to be used for surface section
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| Groups List of element group names for surface section operation (optional) |
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List of element groups by name to be used for surface section
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| Volumes List of volumes for surface section operation (optional) |
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List of volumes to be used for surface section
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| Coordinate_system Coordinate system defining a plane |
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Coordinate system number defining the plane. Required if the section type is "Flat"
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| Output_level Defines output to the log file for the conversion process |
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Defines output to the log file for the conversion process. Valid output levels are • 0 - No output • 1 - Output summary • 2 - Output detailed info
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| Short_line_tolerance Tolerance for creating short lines (Optional) |
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Tolerance for short line removal (Default 0.0005 (0.05%) of the characteristic length of the surface)
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