How can I add a vertex in a named selection based on its coordinates via scripting?

Let's assume I have a vertex at (0,0,0). How could I create a named selection containing this vertex?

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Accepted answers

You can use the Worksheet scoping method to create a named selection with complex criteria using scripting. Here's an example selecting the vertex at (0,0,0) global coordinates:

# Generate a new Named Selection object in Mechanical
myNS = Model.NamedSelections.AddNamedSelection()
# Change the scoping method to "Worksheet" to add complex seleciton criteria
myNS.ScopingMethod = GeometryDefineByType.Worksheet

# Add Selection Criterion in Worksheet
myNS.GenerationCriteria.Add(None)
# Comment: Worksheet / Data View in Mechanical needs refresh to see command actions reflected

# Set Entity type for first Selection criterion to "Vertex"
myNS.GenerationCriteria[0].EntityType = SelectionType.GeoVertex

# Set Criterion to "Location X"
myNS.GenerationCriteria[0].Criterion = SelectionCriterionType.LocationX

# Set operator to "Equals"
myNS.GenerationCriteria[0].Operator = SelectionOperatorType.Equal

# Set desired X location value
myNS.GenerationCriteria[0].Value = Quantity('0 [mm]')

''' The above will select all vertices on x = 0. Hence, we need to filter this further by adding more criteria'''
myNS.GenerationCriteria.Add(None)
myNS.GenerationCriteria[1].Action = SelectionActionType.Filter
myNS.GenerationCriteria[1].EntityType = SelectionType.GeoVertex
myNS.GenerationCriteria[1].Criterion = SelectionCriterionType.LocationY
myNS.GenerationCriteria[1].Operator = SelectionOperatorType.Equal
myNS.GenerationCriteria[1].Value = Quantity('0 [mm]')
myNS.GenerationCriteria.Add(None)
myNS.GenerationCriteria[2].Action = SelectionActionType.Filter
myNS.GenerationCriteria[2].EntityType = SelectionType.GeoVertex
myNS.GenerationCriteria[2].Criterion = SelectionCriterionType.LocationZ
myNS.GenerationCriteria[2].Operator = SelectionOperatorType.Equal
myNS.GenerationCriteria[2].Value = Quantity('0 [mm]')

# Execute the selection criteria and generate the selection:
myNS.Generate()

All comments

Tasos

You can use the Worksheet scoping method to create a named selection with complex criteria using scripting. Here's an example selecting the vertex at (0,0,0) global coordinates:

# Generate a new Named Selection object in Mechanical
myNS = Model.NamedSelections.AddNamedSelection()
# Change the scoping method to "Worksheet" to add complex seleciton criteria
myNS.ScopingMethod = GeometryDefineByType.Worksheet

# Add Selection Criterion in Worksheet
myNS.GenerationCriteria.Add(None)
# Comment: Worksheet / Data View in Mechanical needs refresh to see command actions reflected

# Set Entity type for first Selection criterion to "Vertex"
myNS.GenerationCriteria[0].EntityType = SelectionType.GeoVertex

# Set Criterion to "Location X"
myNS.GenerationCriteria[0].Criterion = SelectionCriterionType.LocationX

# Set operator to "Equals"
myNS.GenerationCriteria[0].Operator = SelectionOperatorType.Equal

# Set desired X location value
myNS.GenerationCriteria[0].Value = Quantity('0 [mm]')

''' The above will select all vertices on x = 0. Hence, we need to filter this further by adding more criteria'''
myNS.GenerationCriteria.Add(None)
myNS.GenerationCriteria[1].Action = SelectionActionType.Filter
myNS.GenerationCriteria[1].EntityType = SelectionType.GeoVertex
myNS.GenerationCriteria[1].Criterion = SelectionCriterionType.LocationY
myNS.GenerationCriteria[1].Operator = SelectionOperatorType.Equal
myNS.GenerationCriteria[1].Value = Quantity('0 [mm]')
myNS.GenerationCriteria.Add(None)
myNS.GenerationCriteria[2].Action = SelectionActionType.Filter
myNS.GenerationCriteria[2].EntityType = SelectionType.GeoVertex
myNS.GenerationCriteria[2].Criterion = SelectionCriterionType.LocationZ
myNS.GenerationCriteria[2].Operator = SelectionOperatorType.Equal
myNS.GenerationCriteria[2].Value = Quantity('0 [mm]')

# Execute the selection criteria and generate the selection:
myNS.Generate()

Mike.Thompson

The scripting process is largely the same, but an FYI you can also use the distance/closest criteria in the GenerationCriteria Criterion/Operator properties to find the closest vertex in case one doesn't exist at the exact location you want.

Rohith Patchigolla

Here is perhaps a sample script to start with.

allBodies = DataModel.GetObjectsByType(DataModelObjectCategory.Body)
allVertices = []
for body in allBodies:
    geoBody = body.GetGeoBody()
    allVertices.extend(geoBody.Vertices)
def find_vertex(vertices, target_x, target_y, target_z, tolerance=1e-3):
    for vertex in vertices:
        if (abs(float(vertex.X) - target_x) < tolerance and
            abs(float(vertex.Y) - target_y) < tolerance and
            abs(float(vertex.Z) - target_z) < tolerance):
            return vertex
    return None

#Coordinate input in Geometry unit (found in the properties of Geometry object in tree)
target = find_vertex(allVertices, 31.96, 1.0968, 3.1091)
if target:
    print("Found vertex")
else:
    print("Vertex not found.")

newNS = Model.AddNamedSelection()
NewSelection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
NewSelection.Ids = [target.Id]
newNS.Location = NewSelection