Hi, I’m new on 3Dslicer with a new project, I try to search on topics but I’m still in troubles. I’m using segmentation from CT-scan to isolate 2 masses. I need you to know how I can have the gravity mass center. Can I have coordinates x/y/z ? Does it run with models ? volumes ? Thanks for all …

It just occurred to me that we changed the bootcamp task to center of mass of fiducials not labelmap. Here’s an older one with the labelmap code: https://www.dropbox.com/s/ee58jil89rw0qxd/20160504_SlicerProgramming_Pinter.pptx?dl=0 (slide 28). I need to reimplement just this for a completely unrela…

Here you go: SlicerRt/SlicerRT/blob/master/Beams/MRML/vtkMRMLRTPlanNode.cxx#L790-L850 bool vtkMRMLRTPlanNode::ComputeTargetVolumeCenter(double center[3]) { center[0] = center[1] = center[2] = 0.0; if (!this->Scene) { vtkErrorMacro("ComputeTargetVolumeCenter: Invalid MRML scene");…

Thanks to everybody ! It’s now ok for me for center of gravity with your help ! Another question : –> Can I analyse surface points coordinates to compute the most distants points for visualizing some 2 or 3 largest diameters of the mass ?

It would be more robust to compute principal axes from labelmap representation. You can then get diameters along those axes. There may be ITK or VTK filters that can help. Let us know about your progress, we may give further help and we could integrate the final solution to Segment Statistics modul…

Related question: how can I change the origin of a model to the center of mass? I found two useful functions GetBounds and GetMesh().GetCenter() . I think the origin is stored in the minimum values Xmin,Ymin and Zmin. The problem I can not find something like model.SetBounds. Here is the idea: …

[image] brhoom: how can I change the origin of a model to the center of mass? See this post: How to display and move the origin coordinates of the surface model (.STL) - #2 by pieper

I just found today that values are different when computing the center from a model e.g.: center = model.GetMesh().GetCenter() output: (-4.173086166381836, -155.35969924926758, -259.25328826904297) and from computing the center using segment center = vtk.vtkCenterOfMass() center.SetInputData(…

Solved! It seems I can get polydata from the model and use the second method e.g. pd= model.GetPolyData() center = vtk.vtkCenterOfMass() center.SetInputData(pd) center.Update() center.GetCenter()

You have many options to compute “center” of a segment. Model node’s GetMesh().GetCenter() method returns center of the bounding box. Depending on the model’s shape it may be close to the center of mass, but they are computed very differently. ▶ See method help vtk.vtkCenterOfMass() applied to a…

Get center of gravity of a segment

Development

lassoan (Andras Lasso) October 12, 2018, 6:14pm 12

See this post: How to display and move the origin coordinates of the surface model (.STL) - #2 by pieper

Topic		Replies	Views
Point inside a closed surface/centre Support	3	462	December 23, 2019
Centroid determination Support segmentation	9	2701	July 3, 2023
Extract Center of masses from binary LabelMapVolume and convert to Fiducials? Support	4	540	September 16, 2023
Calculating centroid based on signal intensity Support segmentation	2	206	November 23, 2023
How to get the coordinates of intersection between vessel centerline and sequential MRI/CT slices in markup fiducials? Support	5	1758	July 4, 2018

Get center of gravity of a segment

Related topics