Something unexpected happened when getting all the components from the point cloud.

[leye123]

I use getAllComponents to get the components of the point cloud, but I can only get one component no matter what the maxDist value is.

    downPcd = mm.PointCloud()
    plane_center /= len(wire)
    plane3 = mm.Plane3f().fromDirAndPt(arcAvgNormal, plane_center)
    
    sections = mm.extractPlaneSections(arc, plane3)
    contours3 = mm.surfacePathsToContours3f(arc, sections)
    for i in range(len(contours3)):
        for j in range(len(contours3[i])):
            downPcd.addPoint(contours3[i][j])

    maxDis = 3
    Components = mm.PointCloudComponents.getAllComponents(downPcd, maxDis, maxComponentCount=3)
    print(Components)

This problem doesn't exist on the online side：

downPcd.zip
meshlib--version 3.1.3.249

[Fedr]

Please note that last run here:

returned two components (two bit-vectors).

The last 1 just indicates that every returned bit-vector describes one component (and not the union of several components).

[leye123]

how do we achieve the online version effect? Which function or parameter should we use?

[Fedr]

UI tool calls exactly the same PointCloudComponents::getAllComponents, but the radius is computed automatically using the function:

/// \brief Finds the radius of ball, so on average that ball contained avgPoints excluding the central point
/// \param samples the number of test points to find given number of samples in each
/// \ingroup PointCloudGroup
MRMESH_API float findAvgPointsRadius( const PointCloud& pointCloud, int avgPoints, int samples = 1024 );

[leye123]

Could you give an example to show how the two are linked together?
is it：

    radius =  mm.findAvgPointsRadius(downPcd, 3, 1024)
    print(radius)
    Components = mm.PointCloudComponents.getAllComponents(downPcd, radius)

[Fedr]

yes

from meshlib import mrmeshpy as mm

pointCloud = ...  # mm.PointCloud
radius = mm.findAvgPointsRadius(pointCloud, 16) # UI default
components, numInGroup = mm.PointCloudComponents.getAllComponents(pointCloud, radius, 100)

[leye123]

Thanks for your reply.