How to get a body or node id associated with a known coordinate point/location

Erik Kostson

Say we have a point/location of interest (x,y,z coordinates), is there a way to get a body closest to this point?

Erik Kostson

Below is a sample code that does this (can of course be done in other ways also). Given a location it will find the nearest body centroid to that point and create a named selection.

bx=0.50 # location of interest 
by=0.50
bz=4.50
dist=1E9




bodies =  ExtAPI.DataModel.Project.Model.GetChildren(DataModelObjectCategory.Body,True)
for body in bodies:
    bc=body.GetGeoBody().Centroid
    cx=bc[0]
    cy=bc[1]
    cz=bc[2]
    distc=sqrt((bx-cx)**2+(by-cy)**2+(bz-cz)**2)
    if distc<dist:
        myb=body.GetGeoBody().Id
        dist=distc

selection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
selection.Ids=[myb]
ns=ExtAPI.DataModel.Project.Model.AddNamedSelection()
ns.Location=selection

Same thing (find nearest node to location of interest) can be done for a node:

bx=1.00
by=0.50
bz=1.00
dist=1E9

meshData= ExtAPI.DataModel.Project.Model.Analyses[0].MeshData
nodes=meshData.Nodes

for node in nodes:
    cx=node.X
    cy=node.Y
    cz=node.Z

    distc=sqrt((bx-cx)**2+(by-cy)**2+(bz-cz)**2)
    if distc<dist:
        myn=node.Id
        myb=node.BodyIds[0] # body id containing node
        dist=distc

selection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.MeshNodes)
selection.Ids=[myn]
ns=ExtAPI.DataModel.Project.Model.AddNamedSelection()
ns.Location=selection

selection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
selection.Ids=[myb]
ns=ExtAPI.DataModel.Project.Model.AddNamedSelection()
ns.Location=selection