Difference between revisions of "Fit Quadric"
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Select one or several point clouds then launch this tool. | Select one or several point clouds then launch this tool. | ||
| − | For each cloud CloudCompare will fit a 2.5D Quadric ( | + | For each cloud CloudCompare will fit a 2.5D Quadric (a plane is fitted first on the cloud so as to determine the 'most flat' dimension). |
[[Image:Cc_fit_quadric_example.jpg|frame|center|Fitted quadric (+ distances between the original cloud and the fitted quadric)]] | [[Image:Cc_fit_quadric_example.jpg|frame|center|Fitted quadric (+ distances between the original cloud and the fitted quadric)]] | ||
| Line 17: | Line 17: | ||
In the console the following pieces of information will be output: | In the console the following pieces of information will be output: | ||
| − | * the 6 quadric equation coefficients (''a + b.x + c.y + d.x<sup>2</sup> + e.y<sup>2</sup> = 0'') | + | * the 6 quadric equation coefficients (''a + b.x + c.y + d.x<sup>2</sup> + e.xy + f.y<sup>2</sup> = 0'') |
* the quadric fitting [http://en.wikipedia.org/wiki/Root_mean_square RMS] | * the quadric fitting [http://en.wikipedia.org/wiki/Root_mean_square RMS] | ||
Revision as of 02:47, 2 September 2016
Menu
This tool is accessible via the 'Tools > Fit > 2.5D Quadric' menu.
Description
This tool fits a 2.5D quadric on a point cloud.
Procedure
Select one or several point clouds then launch this tool.
For each cloud CloudCompare will fit a 2.5D Quadric (a plane is fitted first on the cloud so as to determine the 'most flat' dimension).
Fitted quadric (+ distances between the original cloud and the fitted quadric)
In the console the following pieces of information will be output:
- the 6 quadric equation coefficients (a + b.x + c.y + d.x2 + e.xy + f.y2 = 0)
- the quadric fitting RMS
Notes:
- the fitted quadric is added to the DB tree as a child of the cloud
- the quadric is represented as a standard triangular mesh. Therefore you can select both the cloud and the fitted quadric and compute the distance between them (with 'Tools > Distances > Cloud/Mesh Dist.')