Common Functionality
Laser : Clash Detection in Laser Data
Clash Detection in Laser Data
AVEVA LFM referenced XGEOM elements are clash checked in a similar manner to other AVEVA E3D™ elements. The results are reported as a clash between the AVEVA E3D™ primitive and the laser survey at a specified position. The specified clash position is the centre of a cluster of laser points about which there is a clash. If multiple clashes occur, for example when a pipe intersects with a number of bulkheads, each clash is reported individually.
The laser data clash detection can be set to check against specific obstructions and extrusions. Refer to Laser Obstructions/Exclusions for further information.
Compatibility of Clash Detection between AVEVA E3D™ and PDMS Laser Model Interface
When working in a mixed modelling environment where AVEVA E3D™ and PDMS Laser Model Interface (LMI) clash reports must be shared, it is necessary to use the spatial occupancy hierarchy. When using the XGEOM element in the clashing process, AVEVA E3D™ checks for the existence of the spatial occupancy hierarchy in the Design database. If spatial occupancy is present, the results are reported as a clash between the AVEVA E3D™ primitive and a specific cell on the spatial occupancy map, rather than a clash between the AVEVA E3D™ model and XGEOM. To ensure comparability of laser clash results in a mixed model environment, it may be necessary to generate the XGEOM element in PDMS to ensure that the spatail occupency hierarchy has been created.
Cell based clashing, checks clashes against the XCELLs and does not interrogate the point cloud. Cell based clashing is quicker than exact clashing but will result in more false positives.
Exact clashing expands on Cell clashing and, where a Cell clash has been identified, will further interrogate that geometry to determine whether there is a clash with the point cloud. Exact clashing is more time consuming but will eliminate the false positives.
Refer to Laser Options for further information.
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