(Python) Is there a means to compute the centroid of a triangulated volume / mesh?

[bardiche89]

I executed some Boolean operations and now have a mesh entity, is there a simple API to get its centroid?

Thanks for your help.

[Grantim]

Hello!

The question is what you mean by centroid, there is simple way of calculating bounding box and its center, and a bit more complex way to calculate mass center:

from meshlib import mrmeshpy as mm

mesh = mm.makeUVSphere()

boxCenter = mesh.computeBoundingBox().center()
print(boxCenter)

pointAccum = mm.PointAccumulator()
mm.accumulateFaceCenters(pointAccum,mesh)

centroid = mm.Vector3f()
eigenvectors = mm.Matrix3f()
eigenvalues = mm.Vector3f()
pointAccum.getCenteredCovarianceEigen(centroid,eigenvectors,eigenvalues)
print(centroid)

[bardiche89]

Hello, thank you for the response.

I had some trouble finding specific details in the documentation. I would like to compute the mass center but it seems like the findCenterFromFaces() method works. (assuming no density variance). Is this correct?

I had another question about finding the closest surface triangle of the mesh entity to a point. Do you have any advise on how to approach this one?

Many Thanks.

[Grantim]

Sure, there was findCenterFromFaces() which should be equal to getCenteredCovarianceEigen result.

assuming no density variance

Face areas in this method are considered as weights, so it should work fine even if triangulation is not uniform.

I had another question about finding the closest surface triangle of the mesh entity to a point. Do you have any advise on how to approach this one?

I think you need findProjection function

[bardiche89]

Thank you very much. Understood.