An example of reading field data from an output database

Import the required modules:

#include <iostream.h>
#include <odb_API.h>

Open the output database used by the tutorial.

    odb_Odb& odb = openOdb("viewer_tutorial.odb");
 

Create a variable that refers to the last frame of the first step.

    odb_Step& step = odb.steps()["Step-1"];
    odb_SequenceFrame& allFramesInStep = step.frames();
    int numFrames = allFramesInStep.size();
    odb_Frame& lastFrame = allFramesInStep[numFrames-1];
 

Create a variable that refers to the displacement 'U' in the last frame of the first step.

odb_FieldOutput& displacements = 
    lastFrame.fieldOutputs().get("U");

Create a variable that refers to the node set 'PUNCH' in the part instance'PART-1–1' :

odb_Instance& instance = 
    odb.rootAssembly().instances()["PART-1-1"];
odb_Set& nodeSet = 
    instance.nodeSets()["PUNCH"];

Create a variable that refers to the displacement of the node set in the last frame of the first step:

odb_FieldOutput myDisplacements = 
    displacements.getSubset(nodeSet);

Finally, print some field output data from each node in the node set (a single node in this example).

const odb_FieldValue val = myDisplacements.values()[0];
const float* const data = val.data(numComp);
cout << " Node: " << val.nodeLabel() << endl;
cout << " U = ";
for (int comp=0;comp<numComp;comp++)
    cout << data[comp] << "  ";   
cout << endl;
cout << " Magnitude = " << val.magnitude();

The resulting output is

 Node : 1000  
 U =  0.0000 , -76.4554  
 Magnitude = 76.4554