Examples with PointFem3dAttachment artisynth.core.femmodels.PointFem3dAttachment used on opensource projects

Example 1 with PointFem3dAttachment

use of artisynth.core.femmodels.PointFem3dAttachment in project artisynth_core by artisynth.

the class MFreeFactory method cloneFem.

public static MFreeModel3d cloneFem(MFreeModel3d model, FemModel3d fem) {
    if (model == null) {
        model = new MFreeModel3d();
    }
    HashMap<FemNode3d, MFreeNode3d> nodeMap = new HashMap<FemNode3d, MFreeNode3d>();
    HashMap<MFreeNode3d, FemNode3d> nodeMapInv = new HashMap<MFreeNode3d, FemNode3d>();
    ArrayList<MFreeNode3d> nodeList = new ArrayList<MFreeNode3d>();
    // duplicate nodes
    for (FemNode3d node : fem.getNodes()) {
        MFreeNode3d mnode = new MFreeNode3d(node.getRestPosition());
        // explicit node masses
        mnode.setMassExplicit(true);
        mnode.setMass(node.getMass());
        MFreeNode3d[] deps = new MFreeNode3d[1];
        deps[0] = mnode;
        VectorNd coords = new VectorNd(new double[] { 1 });
        mnode.setDependentNodes(deps, coords);
        nodeMap.put(node, mnode);
        nodeMapInv.put(mnode, node);
        nodeList.add(mnode);
    }
    // convert surface mesh
    FemMeshComp surfaceFem = fem.getSurfaceMeshComp();
    PolygonalMesh mesh = (PolygonalMesh) surfaceFem.getMesh();
    // build mesh
    PolygonalMesh mesh2 = mesh.copy();
    // index vertices
    int idx = 0;
    for (Vertex3d vtx : mesh.getVertices()) {
        vtx.setIndex(idx++);
    }
    idx = 0;
    for (Vertex3d vtx : mesh2.getVertices()) {
        vtx.setIndex(idx++);
    }
    MFreeMeshComp surfaceMFree = new MFreeMeshComp(model, "surface");
    surfaceMFree.setMesh(mesh2);
    // manually build surface attachments
    for (Vertex3d vtx : mesh.getVertices()) {
        PointAttachment pa = surfaceFem.getAttachment(vtx.getIndex());
        if (pa instanceof PointFem3dAttachment) {
            PointFem3dAttachment pfa = (PointFem3dAttachment) pa;
            FemNode[] masters = pfa.getNodes();
            MFreeNode3d[] deps = new MFreeNode3d[masters.length];
            VectorNd coords = new VectorNd(masters.length);
            for (int j = 0; j < masters.length; j++) {
                // mlist.add (new ContactMaster (masters[j], pfa.getCoordinate(j)));
                deps[j] = nodeMap.get(masters[j]);
                coords.set(j, pfa.getCoordinate(j));
            }
            surfaceMFree.setVertexAttachment(vtx.getIndex(), coords.getBuffer(), deps);
        } else {
            PointParticleAttachment ppa = (PointParticleAttachment) pa;
            DynamicComponent[] masters = ppa.getMasters();
            MFreeNode3d[] deps = new MFreeNode3d[1];
            deps[0] = nodeMap.get(masters[0]);
            VectorNd coords = new VectorNd(new double[] { 1 });
            surfaceMFree.setVertexAttachment(vtx.getIndex(), coords.getBuffer(), deps);
        }
    }
    // integration regions by copying elements
    ArrayList<MFreeElement3d> elemList = new ArrayList<MFreeElement3d>(fem.numElements());
    HashMap<FemElement3d, MFreeElement3d> elemMap = new HashMap<FemElement3d, MFreeElement3d>(fem.numElements());
    for (FemElement3d elem : fem.getElements()) {
        MFreeNode3d[] elemNodes = new MFreeNode3d[elem.numNodes()];
        FemNode3d[] fnodes = elem.getNodes();
        for (int i = 0; i < elem.numNodes(); i++) {
            elemNodes[i] = nodeMap.get(fnodes[i]);
        }
        MFreeElement3d region = new MFreeElement3d(null, elemNodes);
        // region.setAllTermsActive(true);
        MFreeIntegrationPoint3d[] mpnts = new MFreeIntegrationPoint3d[elem.numIntegrationPoints()];
        IntegrationData3d[] mdata = new IntegrationData3d[elem.numIntegrationPoints()];
        IntegrationPoint3d[] ipnts = elem.getIntegrationPoints();
        IntegrationData3d[] idata = elem.getIntegrationData();
        for (int i = 0; i < ipnts.length; i++) {
            Point3d pos = new Point3d();
            ipnts[i].computePosition(pos, elem.getNodes());
            Vector3d[] gradU = ipnts[i].getGNs();
            ArrayList<Vector3d> grads = new ArrayList<Vector3d>();
            for (Vector3d g : gradU) {
                grads.add(g);
            }
            MFreeIntegrationPoint3d mpnt = MFreeIntegrationPoint3d.create(elemNodes, ipnts[i].getShapeWeights(), grads, ipnts[i].getWeight());
            IntegrationData3d mdat = new IntegrationData3d();
            mdat.setRestInverseJacobian(idata[i].getInvJ0(), idata[i].getDetJ0());
            mpnts[i] = mpnt;
            mdata[i] = mdat;
        }
        // set warping point
        if (region.getWarpingPoint() == null) {
            IntegrationPoint3d wpnt = elem.getWarpingPoint();
            IntegrationData3d wdat = elem.getWarpingData();
            Point3d pos = new Point3d();
            wpnt.computePosition(pos, elem.getNodes());
            // Vector3d [] gradU = wpnt.updateShapeGradient(wdat.getInvJ0());
            Vector3d[] gradU = wpnt.getGNs();
            ArrayList<Vector3d> grads = new ArrayList<Vector3d>();
            for (Vector3d g : gradU) {
                grads.add(g);
            }
            // MFreeIntegrationPoint3d mpnt =
            // MFreeIntegrationPoint3d.create(pos, deps,
            // wpnt.getShapeWeights(), grads, wpnt.getWeight()*wdat.getDetJ0());
            MFreeIntegrationPoint3d mpnt = MFreeIntegrationPoint3d.create(elemNodes, wpnt.getShapeWeights(), grads, wpnt.getWeight());
            region.setWarpingPoint(mpnt);
            IntegrationData3d wdata = new IntegrationData3d();
            wdata.setRestInverseJacobian(wdat.getInvJ0(), wdat.getDetJ0());
            region.setWarpingPoint(mpnt, wdata);
        }
        region.setIntegrationPoints(mpnts, mdata);
        elemList.add(region);
        elemMap.put(elem, region);
    }
    // add everything to model
    model.addNodes(nodeList);
    model.addElements(elemList);
    model.setSurfaceMeshComp(surfaceMFree);
    // copy properties
    model.setDensity(fem.getDensity());
    model.setParticleDamping(fem.getParticleDamping());
    model.setStiffnessDamping(fem.getStiffnessDamping());
    // copy over all masses
    for (FemNode3d node : fem.getNodes()) {
        nodeMap.get(node).setMass(node.getMass());
    }
    for (FemElement3d elem : fem.getElements()) {
        elemMap.get(elem).setMass(elem.getMass());
    }
    model.setMaterial(fem.getMaterial());
    return model;
}

Example 2 with PointFem3dAttachment

use of artisynth.core.femmodels.PointFem3dAttachment in project artisynth_core by artisynth.

the class MFreeMeshComp method scanAttachment.

protected void scanAttachment(ReaderTokenizer rtok, Deque<ScanToken> tokens) throws IOException {
    ArrayList<Double> weights = new ArrayList<Double>();
    rtok.scanToken('[');
    tokens.offer(ScanToken.BEGIN);
    while (ScanWriteUtils.scanAndStoreReference(rtok, tokens)) {
        weights.add(rtok.scanNumber());
    }
    if (rtok.ttype != ']') {
        throw new IOException("Expected ']', got " + rtok);
    }
    // while (rtok.nextToken() != ']') {
    // rtok.pushBack();
    // ScanWriteUtils.scanReferenceToken (rtok, tokens);
    // weights.add (rtok.scanNumber());
    // }
    // add null terminator
    tokens.offer(ScanToken.END);
    if (weights.size() == 1) {
        PointParticleAttachment ppa = new PointParticleAttachment();
        myVertexAttachments.add(ppa);
    } else {
        PointFem3dAttachment pfa = new PointFem3dAttachment();
        tokens.offer(new ObjectToken(ArraySupport.toDoubleArray(weights)));
        myVertexAttachments.add(pfa);
    }
}

Example 3 with PointFem3dAttachment

use of artisynth.core.femmodels.PointFem3dAttachment in project artisynth_core by artisynth.

the class MFreeMeshComp method buildNodeVertexMap.

protected void buildNodeVertexMap() {
    myNodeVertexMap = new HashMap<MFreeNode3d, Vertex3d>();
    myNumSingleAttachments = 0;
    for (int i = 0; i < myVertexAttachments.size(); i++) {
        PointAttachment pa = myVertexAttachments.get(i);
        if (pa instanceof PointParticleAttachment) {
            MFreeNode3d node = (MFreeNode3d) ((PointParticleAttachment) pa).getParticle();
            myNodeVertexMap.put(node, getMesh().getVertex(i));
            myNumSingleAttachments++;
        } else if (pa instanceof PointFem3dAttachment) {
            PointFem3dAttachment pfa = (PointFem3dAttachment) pa;
            for (FemNode node : pfa.getNodes()) {
                if (myNodeVertexMap.get(node) == null) {
                    myNodeVertexMap.put((MFreeNode3d) node, NO_SINGLE_VERTEX);
                }
            }
        }
    }
}

Example 4 with PointFem3dAttachment

use of artisynth.core.femmodels.PointFem3dAttachment in project artisynth_core by artisynth.

the class MFreeMeshComp method addVertexNodes.

private void addVertexNodes(HashSet<MFreeNode3d> nodes, Vertex3d vtx) {
    PointAttachment pa = getAttachment(vtx.getIndex());
    if (pa instanceof PointFem3dAttachment) {
        PointFem3dAttachment pfa = (PointFem3dAttachment) pa;
        FemNode[] masters = pfa.getNodes();
        for (int j = 0; j < masters.length; j++) {
            nodes.add((MFreeNode3d) masters[j]);
        }
    } else {
        PointParticleAttachment ppa = (PointParticleAttachment) pa;
        nodes.add((MFreeNode3d) ppa.getParticle());
    }
}

Example 5 with PointFem3dAttachment

use of artisynth.core.femmodels.PointFem3dAttachment in project artisynth_core by artisynth.

the class MFreeMeshComp method createEmbedded.

/**
 * Assumes the mesh is in "rest" coordinates, not current coordinates
 * @param surf mfree surface to populate (or null to create one)
 * @param mesh mesh to embed
 * @param mfree model to embed mesh in
 * @return populated or created mesh
 */
public static MFreeMeshComp createEmbedded(MFreeMeshComp surf, MeshBase mesh, MFreeModel3d mfree) {
    double reduceTol = 1e-8;
    ArrayList<MFreeNode3d> nodes = new ArrayList<MFreeNode3d>();
    VectorNd weights = new VectorNd();
    if (surf == null) {
        surf = new MFreeMeshComp(mfree);
    }
    surf.setMesh(mesh);
    ArrayList<Vertex3d> verts = mesh.getVertices();
    Point3d coords = new Point3d();
    ArrayList<FemNode3d> deps = new ArrayList<>();
    MLSShapeFunction sfunc = new MLSShapeFunction();
    surf.myVertexAttachments.clear();
    for (int i = 0; i < verts.size(); i++) {
        // this could works very similarly to the code that adds
        // marker points into a mesh
        Vertex3d vtx = verts.get(i);
        deps.clear();
        mfree.findDependentNodesAtRest(vtx.pnt, deps);
        // compute shape function
        VectorNd N = new VectorNd(deps.size());
        MFreeNode3d[] dnodes = deps.toArray(new MFreeNode3d[deps.size()]);
        sfunc.update(vtx.pnt, dnodes);
        sfunc.eval(N);
        // first see if there's a node within reduceTol of the point,
        // and if so just use that
        double maxDist = Double.NEGATIVE_INFINITY;
        double minDist = Double.POSITIVE_INFINITY;
        MFreeNode3d nearestNode = null;
        for (int k = 0; k < dnodes.length; k++) {
            double d = vtx.pnt.distance(dnodes[k].getRestPosition());
            if (d > maxDist) {
                maxDist = d;
            }
            if (d < minDist) {
                minDist = d;
                nearestNode = dnodes[k];
            }
        }
        if (minDist / maxDist <= reduceTol) {
            // weight everything to the nearest node
            nodes.clear();
            nodes.add(nearestNode);
            weights.setSize(0);
            weights.append(1.0);
        } else {
            nodes.clear();
            weights.setSize(0);
            for (int k = 0; k < N.size(); k++) {
                if (Math.abs(N.get(k)) >= reduceTol) {
                    nodes.add(dnodes[k]);
                    weights.append(N.get(k));
                }
            }
        }
        if (weights.size() > 1) {
            PointFem3dAttachment attacher = new PointFem3dAttachment();
            attacher.setFromNodes(nodes, weights);
            surf.myVertexAttachments.add(attacher);
        } else if (weights.size() == 1) {
            PointParticleAttachment attacher = new PointParticleAttachment(nodes.get(0), null);
            surf.myVertexAttachments.add(attacher);
        }
    }
    surf.buildNodeVertexMap();
    return surf;
}