Latest revision as of 03:49, 2 September 2016

Description

This tool fits a 2.5D quadric on a point cloud.

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: z = a + b.x + c.y + d.x² + e.xy + f.y² (mind that depending on which is the 'most flat' dimension, 'x', 'y' and 'z' can be permuted)
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.')

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 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.xy + f.y<sup>2</sup> = 0'')
+* the 6 quadric equation coefficients: ''z = a + b.x + c.y + d.x<sup>2</sup> + e.xy + f.y<sup>2</sup>'' (''mind that depending on which is the 'most flat' dimension, 'x', 'y' and 'z' can be permuted'')
 * the quadric fitting [http://en.wikipedia.org/wiki/Root_mean_square RMS]