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Undet Surface Analysis tools

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Surface analysis tools will let you check and visualize model accuracy and scan stations registration (compare created model with point cloud data). Created analysis will stay in a Revit file. To review analysis in other PC you will need to have installed Undet for Revit plug-in, but plug-in can be without an activated license.

|Surface analysis section| Analyse – opens main surface analysis tools dialog*
Load – load created analysis into Model
Delete – delete created analysis database, after database deleted you will not be able load created analysis
Edit style – opens analysis display settings

* Analyse tool is active only when is loaded Undet project in Undet Slice dialog.

Analyse dialog

| Surface analysis settings

& selection |

Grid Size – select GRID cell to divide planes of the Revit model (components) to calculate surface analyze.
Depth Inside – set maximum inside depth from Revit model (components) planes, to analyze deviations.
Depth Outside – set maximum outside depth from Revit model (components) planes, to analyze deviations.
Calculation Method – choose a surface analysis method, in most cases, the “Mode” method is the best selection to start with.
Data Source – select data source (point cloud density), which will be used to analyze the model
Host – select model part types, which will be used to analyzed.
Orientation – select the orientation of model parts to analyze (Ex. floors – horizontal, walls vertical…)
Select all – Auto-selection of all host & orientation options
Single face – select and analyze single model face
Multiple face – select and analyze multiple model faces
Auto by Filter – auto-select and analyze model by filter option
Cancel – closes surface analysis dialog

Example with different GRID size:

GRID size 10-30mm

(example with 10mm GRID size)

Source: All points

GRID size 30mm

(example with 30mm GRID size)
Source: All points

GRID size 30-60mm

(example with 60mm GRID size)

Source: All points

Suitable for high-density scans, to evaluate very detailed deformations. A trade-off between speed and accuracy. Recommended size. The calculations are faster, but only large- rough deviations can be estimated
Note: GRID size is critical settings when you are using decimated or all preview GRID points, because the source point cloud data (points) will be less dense than analyzes GRID step, it may create incorrect analysis view (low reliability). If you are using all points it will affect only speed and detailed view.
If your Undet project type: Detailed scanned objects

Preview points grid is 1 x 1 cm. Please select GIRD size 30mm-> or use all points for analyzing.

If your Undet project type: Buildings, Infrastructure, plants

Preview points grid is 3 x 3 cm

Please select GIRD size 60mm-> or use all points for analyzing.

Explanation of Inside – Outside depth interval selection

Set Inside – outside depth is needed to optimize calculation speed depending on the size of deformation you expect.

Multiple Face selection

Selection using Multiple face command must be confirmed by pressing the “Finish” command. Selection working only for objects which are checked in analyses settings (Surface Analysis Options) filter section.

1. Select multiple objects with rectangle by filter options.

2. Click “Finish” to start analysis calculations

Surface analysis Calculation Methods

Mode (default) – “Mode” selection uses most often point cloud points in the selected GRID cell to calculate & visualize surface analyze. This is the default setting to calculate surface analyze.
Minimum – “Minimum” selection uses first point cloud points in the selected GRID cell to calculate & visualize surface analyze.
Maximum – “Maximum” selection uses last point cloud points in the selected GRID cell to calculate & visualize surface analyze.
Random – “Random” selection uses random point cloud points in the selected GRID cell to calculate & visualize surface analyze.
Average – “Average” selection uses average point cloud points in the selected GRID cell to calculate & visualize surface analyze.
StdDev – “StdDev” selection uses point cloud points by selecting them according to standard deviation in the selected GRID cell to calculate & visualize surface analyze.
Count – “Count” selection analyzes & visualizes selected GRID cell whether it contains scan data.
Delta – “Delta” selection uses difference between Minimum and Maximum point cloud points in the selected GRID cell to calculate & visualize surface analyze.
Scan Diff – “Scan Diff” selection analyzes individual scan position points in the selected GRID cell, to show the maximum difference between scan positions data, to see alignment errors of scan stations.
Scan Overlap – “Scan Overlap” selection analyzes & visualizes how much different scan positions data is in the selected GRID cell.

Results example with different calculation method:

Panoramic view from scan station
Mode (default). Source: all points
Count. Source: all points. A non-green spots means that these elements are not modeled or have no scan data covering.
Scan DIFF. Source: all points. Green spots mean that scan station registration (alignment) is done correctly.

Data source selection

Decimated points – Choice to analyze model using decimated point cloud preview points (default density 5%, which can be adjusted in Undet Slice dialog. (Fast performance, suitable for quick analysis of the model)
Preview Points – Choice to analyze model using all point cloud preview points GRID (Building type project type preview points grid 3x3cm) (Moderate performance, suitable for detail analysis of the model)
All Points – Choice to analyze model using all point cloud points. (Slow performance, suitable for very detailed analysis of the model parts)

Results example with different data source:

Decimated points (~5% of preview points density; decimation rate can be adjusted 1-100%)
Preview points GRID (Buildings type project preview GRID 3cm x 3cm)
All points

Edit style dialog

In this dialog, you can edit and customize surface analysis display styles. Color ranges, can be customized to meet target tolerances and need.

Already prepared analysis display styles:

Count – Choice to analyze model covering from different scanning stations
Gradient – Gradient coloring range to analyze model accuracy (Blue – Red).
RCIS_BLUE_RED – Choice to analyze model accuracy by RICS (Practice Standards) requirements; Color range: Individual Bar Charts (Blue – Red).
RCIS_CDE – Choice to analyze model accuracy by RICS (Practice Standards) requirements; Color range: Individual Bar Charts (Red – Green – Red).
Undet (default) – Default coloring range to analyze model accuracy by Undet client’s best practices.
USIBD -Choice to analyze model accuracy by USIBD (U.S. Institute of building documentation) requirements; Color range: Individual Bar Charts (Red – Green – Red).
USIBD_BLUE_RED Choice to analyze model accuracy by USIBD (U.S. Institute of building documentation) requirements; Color range: Individual Bar Charts (Blue – Red).
RCIS_CDE style coloring intervals USIBD_BLUE_RED style coloring intervals

Select / change analysis display styles

To change surface analysis display style in Revit properties menu, click Analysis Display Settings Edit…

In Analysis Results Settings you can control the visibility of individual analyzes and change the analysis display style (Count; Gradient; RCIS_BLUE_RED; RCIS_CDE; Undet (default); USIBD; USIBD_BLUE_RED)

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