## On this page

  

 

 # Check Mesh Connectivity 

 Last update: 16.07.2025 

Check FEM-mesh connectivity using the Lua script API.

base_path = sos.arg[0];

file_name = base_path .. "/connectivity/mesh.sdb"



-- load database

local settings = sos.LoadDataBaseSettings(file_name);

sos.loadDataBase(sos.database(), settings);

settings = nil

-- end of: Load database



sos.setLogLevel(3)



-- get a handle for the mesh:

mesh = sos.database():referenceMesh()



-- parts are an internal "scoping". every node/element is member of a "part".

num_parts = mesh:numParts();

print("num_parts: ", num_parts)

-- this will be our mesh part:

part = mesh:part(0) -- For ANSYS: there is only one part -> here #0



-- get some info:

num_nodes = part:pointSize()

num_elems = part:elementSize();

print("number of elements: " .. num_elems .. ", number of nodes: " .. num_nodes)



-- get a single node:

node100 = part:point(100) -- get the node with ANSYS internal index 100

print("node100:");

print("node100.part_index: " .. node100:part_index() ); -- which part ? -> should be zero

print("node100.index: " .. node100:index() ); -- which node index in part ? (e.g. index in ANSYS FEM mesh)

print("node100.isPartOfSurface: " , node100:isPartOfSurface () ); -- is this node part of the surface ?

print("node100.numElements: " .. node100:numElements() ); -- how many elements are connected to this node ?

element = node100:elementAt(2-1) -- get one of these elements (0..numElements-1)

for i=1,node100:numElements() do -- loop over all elements connected to the node

 local current_element = node100:elementAt(i-1) -- get the current element iterate

 print("local element #" .. i .. ": element index " .. current_element:index() )

end

print("elememt #2 of node #100 has index " .. element:index() ) -- get element index (within the part, i.e.e the ANSYS FEM index)

print("element has type " .. element:elementTypeString() ) -- some information on the element type

print("element:isDegenerated():", element:isDegenerated() ) -- is it a true volume element - or degenerated somehow ?

print("element has " .. element:numNodes() .. " nodes."); -- number of nodes belonging to the elements (multiple counting is posible for degenerated elements)

for i=1,element:numNodes() do -- a loop over all element nodes

 local local_node = element:nodeAt(i-1) -- get the i-th element node (0..numNodes-1)

 print("local node #" ..i .. ": node index " .. local_node:index() ) -- print some info on this node

end



-- here we show how we access the data vector (e.g. obtained from FMOP) for the respective node or element:

print("Index of node100 in data vector: " .. sos.globalIndexFromNode ( sos.database(), node100:part_index(), node100:index() ));

print("Index of element in data vector: " .. sos.globalIndexFromElement( sos.database(), element:part_index(), element:index() ));



-- print general information on the mesh:

sos.printMeshInfo(sos.database());