Debris Filter

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Getting Started

This article will go over the Debris Filter. The Debris Filter will attempt to remove any points from your point cloud such as cables, dirt piles, ect. that are on the floor.

You can find this tool in the Builder toolbar, under Surfaces. See screenshot below:

Fig 1: Debris filter button

The Debris Filter

After selecting the debris filter, use the left mouse clicks to define a point and draw a polygon around the area to be analysed. Press Enter to automatically fill in the remaining side of the polygon.

This will open up the Debris Filter settings.

Filtering Settings

Fig 2: Debris Filter dialog box
  • Subsampling: Click the Enable checkbox, then use the slider bar to control the decimation of the point cloud. Slide more to the right for more decimation, slide to the left for less. “Using more points” is heavier decimation and “using less points” is a lighter decimation. We recommend a 1 inch decimation for most projects. You will not need to enable this if the scans have been decimated previously.
  • Range Filter: Check the Enable box then set the distance. Following that, any points above or below the median point elevation will be filtered out. Note that this option is not necessary if you apply a section box to your point cloud in Navisworks.
  • Grid Spacing: Determines the outlier search area. Larger grid spacing is better for flatter/ indoor floors (or freshly poured concrete). A lower grid spacing usually applies to outdoor floors, or floors with more deviation.
  • Height Sensitivity: On each grid section the average z axis value is calculated and anything that is above the average plus the “Height Sensitivity”, or below the average minus the “Height sensitivity”, is filtered out. Note that “Grid Spacing” controls how large each section of the grid will be. Tighter grids will give better results if the average height of the surface is changing more drastically.
  • Cleanup Radius: If enabled, this setting will eliminate additional points from the point cloud. All points that are closer than cleanup radius to the points identified by height sensitivity will also be marked as debris

Apply the filter to the points in Rithm. Points that have been filtered out will be displayed in red. The points will be filtered out from affecting a heat map or contour map.

Delete Points will remove the filtered points from the Rithm project completely.

Remove Filter will remove the filter from the Rithm project.

Add Surface allows for the creation of either a heat map or a contour map using the filtered points as a base.

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