Examples with LinearMaterial artisynth.core.materials.LinearMaterial used on opensource projects

Example 11 with LinearMaterial

use of artisynth.core.materials.LinearMaterial in project artisynth_core by artisynth.

the class SingleHex method build.

public void build(String[] args) {
    mod = new FemModel3d();
    double[] coords = new double[] { -2, -2, -2, 2, -2, -2, -2, 2, -2, 2, 2, -2, -2, -2, 2, 2, -2, 2, -2, 2, 2, 2, 2, 2 };
    FemNode3d[] nodes = new FemNode3d[8];
    for (int i = 0; i < 8; i++) {
        nodes[i] = new FemNode3d(coords[i * 3], coords[i * 3 + 1], coords[i * 3 + 2]);
        mod.addNode(nodes[i]);
    }
    HexElement hex = new HexElement(nodes[4], nodes[5], nodes[7], nodes[6], nodes[0], nodes[1], nodes[3], nodes[2]);
    mod.addElement(hex);
    // FemNode3d dummy = new FemNode3d(0.0, 0.5, 0.01);
    // dummy.setDynamic(false);
    // mod.addNode(dummy);
    mod.setSurfaceRendering(SurfaceRender.Shaded);
    RenderProps.setShading(mod, Renderer.Shading.FLAT);
    RenderProps.setFaceColor(mod, Color.PINK);
    RenderProps.setShininess(mod, mod.getRenderProps().getShininess() * 10);
    RenderProps.setVisible(mod, true);
    RenderProps.setFaceStyle(mod, Renderer.FaceStyle.FRONT);
    mechMod = new MechModel("mech");
    mechMod.addModel(mod);
    mechMod.setIntegrator(MechSystemSolver.Integrator.ConstrainedBackwardEuler);
    addModel(mechMod);
    // addModel (mod);
    RenderProps.setPointStyle(mod, Renderer.PointStyle.SPHERE);
    RenderProps.setPointRadius(mod, 0.05);
    mod.setGravity(0, 0, -9.8);
    mod.setIncompressible(FemModel.IncompMethod.OFF);
    // mod.setGravity (0, 0, -1);
    LinearMaterial linMat = new LinearMaterial();
    linMat.setYoungsModulus(1000);
    linMat.setPoissonsRatio(0);
    IncompNeoHookeanMaterial inhMat = new IncompNeoHookeanMaterial();
    inhMat.setBulkModulus(30000);
    inhMat.setShearModulus(3000);
    MooneyRivlinMaterial monMat = new MooneyRivlinMaterial();
    monMat.setBulkModulus(15000000);
    monMat.setC10(150000);
    monMat.setJLimit(0.2);
    // mod.setMaterial (new StVenantKirchoffMaterial());
    // mod.setMaterial (new NeoHookeanMaterial());
    mod.setMaterial(monMat);
    // mod.setMaterial (linMat);
    mod.setDensity(10000);
    // nodes[0].setDynamic(false);
    // nodes[3].setDynamic(false);
    FemMarker mkr = new FemMarker(0, -1, 0);
    mod.addMarker(mkr, mod.findContainingElement(mkr.getPosition()));
    if (true) {
        // fix the top nodes
        for (int i = 4; i < 8; i++) {
            nodes[i].setDynamic(false);
        }
    }
    if (false) {
        // fix the side nodes
        nodes[0].setDynamic(false);
        nodes[2].setDynamic(false);
        nodes[4].setDynamic(false);
        nodes[6].setDynamic(false);
    }
    // nodes[1].setPosition (-0.40, -2.13, -5.86);
    // nodes[5].setPosition (3.73, -2.02, -3.56);
    // nodes[7].setPosition (3.73,  2.02, -3.56);
    // nodes[3].setPosition (-0.40,  2.13, -5.86);
    // set to invert elements
    // nodes[1].setPosition (-3.001, -2, -2);
    // nodes[5].setPosition (-3.001, -2,  2);
    // nodes[7].setPosition (-3.001,  2,  2);
    // nodes[3].setPosition (-3.001,  2, -2);
    createControlPanel(mechMod, mod);
    mod.setSoftIncompMethod(IncompMethod.AUTO);
    SolveMatrixTest tester = new SolveMatrixTest();
    // System.out.println ("error=" + tester.testStiffness (mod, 1e-8));
    // System.out.println ("K=\n" + tester.getK().toString ("%10.1f"));
    // System.out.println ("N=\n" + tester.getKnumeric().toString ("%10.1f"));
    System.out.println("gravity weights=" + hex.computeGravityWeights().toString("%8.3f"));
}

Example 12 with LinearMaterial

use of artisynth.core.materials.LinearMaterial in project artisynth_core by artisynth.

the class TransverseIsotropyTest method build.

@Override
public void build(String[] args) throws IOException {
    super.build(args);
    MechModel mech = new MechModel("mech");
    addModel(mech);
    double h = 0.1;
    double r = 0.005;
    FemModel3d fem = createCylinder(h, r);
    fem.setName("transverse");
    mech.addModel(fem);
    TransverseLinearMaterial mat = new TransverseLinearMaterial();
    mat.setYoungsModulus(50000, 50000);
    mat.setPoissonsRatio(0.45, 0.45);
    double G = 50000 / (2 * (1 + 0.45));
    mat.setShearModulus(G);
    mat.setCorotated(true);
    fem.setMaterial(mat);
    FemModel3d fem2 = createCylinder(h, r);
    fem2.setName("linear");
    LinearMaterial lmat = new LinearMaterial(50000, 0.45, true);
    fem2.setMaterial(lmat);
    mech.addModel(fem2);
    RigidTransform3d rot = new RigidTransform3d(Vector3d.ZERO, AxisAngle.ROT_Y_90);
    fem.transformGeometry(rot);
    fem2.transformGeometry(rot);
    fem2.transformGeometry(new RigidTransform3d(new Vector3d(0, 2 * r, 0), AxisAngle.IDENTITY));
    RenderProps.setFaceColor(fem2, Color.MAGENTA);
}

Example 13 with LinearMaterial

use of artisynth.core.materials.LinearMaterial in project artisynth_core by artisynth.

the class FemCollisions method build.

@Override
public void build(String[] args) throws IOException {
    super.build(args);
    // Reduce step size to better resolve collisions
    setMaxStepSize(0.0002);
    // Create and add main MechModel
    MechModel mech = new MechModel("mech");
    addModel(mech);
    // -------------------------------------------------------------
    // BEAM
    // -------------------------------------------------------------
    // Create FEM beam
    FemModel3d beam = new FemModel3d("beam");
    mech.addModel(beam);
    // widths
    double[] size = { 0.003, 0.0015, 0.0015 };
    // resolution
    int[] res = { 4, 2, 2 };
    FemFactory.createGrid(beam, FemElementType.Hex, size[0], size[1], size[2], res[0], res[1], res[2]);
    // Set properties
    beam.setDensity(1000);
    beam.setMaterial(new LinearMaterial(300, 0.33));
    // -------------------------------------------------------------
    // ELLIPSOID
    // -------------------------------------------------------------
    // Create FEM ellipsoid
    FemModel3d ellipsoid = new FemModel3d("ellipsoid");
    mech.addModel(ellipsoid);
    // radii (z, x, y)
    double[] radii = { 0.002, 0.001, 0.001 };
    // resolution (theta, phi, r)
    int[] eres = { 16, 4, 3 };
    FemFactory.createEllipsoid(ellipsoid, radii[0], radii[1], radii[2], eres[0], eres[1], eres[2]);
    // Set properties
    ellipsoid.setDensity(1000);
    ellipsoid.setMaterial(new LinearMaterial(300, 0.33));
    // Transform: rotate 90 degrees about X-Axis
    // translate up by 0.003
    RigidTransform3d trans = new RigidTransform3d();
    trans.setRotation(new AxisAngle(1, 0, 0, Math.PI / 2));
    trans.setTranslation(new Vector3d(0, 0.0005, 0.003));
    ellipsoid.transformGeometry(trans);
    // -------------------------------------------------------------
    // BLOCK WITH EMBEDDED SPHERE
    // -------------------------------------------------------------
    // Create FEM block
    FemModel3d block = new FemModel3d("block");
    mech.addModel(block);
    FemFactory.createHexGrid(block, 0.002, 0.002, 0.002, 3, 3, 3);
    // Set properties
    block.setDensity(1000);
    block.setMaterial(new LinearMaterial(300, 0.33));
    // Create embedded sphere
    double r = 0.0008;
    // level of refinement
    int ref = 2;
    PolygonalMesh sphere = MeshFactory.createOctahedralSphere(r, ref);
    FemMeshComp embeddedSphere = block.addMesh("embedded", sphere);
    // Transform: rotate 90 degrees about X-Axis
    // translate left by 0.003
    trans = new RigidTransform3d();
    trans.setTranslation(new Vector3d(0, 0.003, 0));
    block.transformGeometry(trans);
    // -------------------------------------------------------------
    // TABLE AND COLLISIONS
    // -------------------------------------------------------------
    RigidBody table = RigidBody.createBox("table", 0.005, 0.0075, 0.0008, 0);
    table.setDynamic(false);
    table.setPose(new RigidTransform3d(new Vector3d(0, 0.0015, -0.002), AxisAngle.IDENTITY));
    mech.addRigidBody(table);
    // Set up collisions
    mech.setCollisionBehavior(ellipsoid, beam, true, 0.1);
    mech.setCollisionBehavior(ellipsoid, table, true, 0.1);
    mech.setCollisionBehavior(embeddedSphere, table, true, 0.1);
    mech.setCollisionBehavior(ellipsoid, embeddedSphere, true, 0.1);
    mech.setCollisionBehavior(table, beam, true, 0.1);
    // -------------------------------------------------------------
    // RENDER PROPERTIES
    // -------------------------------------------------------------
    // Draw beam element widgets
    beam.setElementWidgetSize(0.8);
    RenderProps.setLineWidth(beam.getElements(), 0);
    // Make beam blue, and give it a transparent surface
    RenderProps.setFaceColor(beam, Color.BLUE);
    beam.setSurfaceRendering(SurfaceRender.Shaded);
    RenderProps.setAlpha(beam.getMeshComp("surface"), 0.4);
    // Make the ellipsoid red
    RenderProps.setFaceColor(ellipsoid, Color.RED);
    RenderProps.setLineColor(ellipsoid, Color.RED.darker());
    ellipsoid.setSurfaceRendering(SurfaceRender.Shaded);
    // Make the block green
    RenderProps.setFaceColor(block, Color.GREEN);
    RenderProps.setLineColor(block, Color.GREEN.darker());
}

Example 14 with LinearMaterial

use of artisynth.core.materials.LinearMaterial in project artisynth_core by artisynth.

the class FemMuscleHeart method build.

// Model builder
@Override
public void build(String[] args) throws IOException {
    super.build(args);
    setMaxStepSize(0.005);
    // Root mechanical model
    MechModel mech = new MechModel("mech");
    mech.setGravity(0, 0, -9.8);
    addModel(mech);
    // -------------------------------------------------------------
    // HEART LOAD / ADD GEOMETRY
    // -------------------------------------------------------------
    // Heart surface mesh, with texture
    String heartFile = ArtisynthPath.getSrcRelativePath(this, "data/HumanHeart.obj");
    WavefrontReader wfr = new WavefrontReader(new File(heartFile));
    PolygonalMesh heartMesh = new PolygonalMesh();
    wfr.readMesh(heartMesh);
    // triangulate for interaction
    heartMesh.triangulate();
    // FEM heart:
    // - FEM mesh of heart convex hull
    // - embedded heart surface geometry
    FemMuscleModel heart = new FemMuscleModel("heart");
    TetGenReader.read(heart, ArtisynthPath.getSrcRelativePath(this, "data/HumanHeartHull.node"), ArtisynthPath.getSrcRelativePath(this, "data/HumanHeartHull.ele"));
    // add real-looking mesh
    FemMeshComp embeddedHeart = heart.addMesh(heartMesh);
    embeddedHeart.setName("embedded");
    // Allow inverted elements (poor quality mesh)
    heart.setWarnOnInvertedElements(false);
    heart.setAbortOnInvertedElements(false);
    // Convert unites to metres (original was cm)
    heart.scaleDistance(0.01);
    heart.setGravity(0, 0, -9.8);
    heart.setStiffnessDamping(0.02);
    // Set material properties
    heart.setDensity(1000);
    FemMaterial femMat = new LinearMaterial(2500, 0.33, true);
    // simple muscle
    MuscleMaterial muscleMat = new SimpleForceMuscle(500.0);
    heart.setMaterial(femMat);
    // Add heart to model
    mech.addModel(heart);
    // -------------------------------------------------------------
    // MUSCLE BUNDLES
    // -------------------------------------------------------------
    // One "long" direction muscle bundle
    // One "radial" muscle bundle
    // LONG BUNDLE
    // Compute the "long" direction of the heart
    PolygonalMesh hull = heart.getSurfaceMesh();
    RigidTransform3d trans = hull.computePrincipalAxes();
    Vector3d longAxis = new Vector3d();
    // first column of rotation
    trans.R.getColumn(0, longAxis);
    // Create the long axis muscle bundle
    MuscleBundle longBundle = new MuscleBundle("long");
    for (FemElement3d elem : heart.getElements()) {
        longBundle.addElement(elem, longAxis);
    }
    longBundle.setMuscleMaterial(muscleMat);
    heart.addMuscleBundle(longBundle);
    // RADIAL BUNDLE
    // Compute a plane through centre of heart
    Plane plane = new Plane(longAxis, new Point3d(trans.p));
    Point3d centroid = new Point3d();
    Vector3d radialDir = new Vector3d();
    // Create the radial muscle bundle
    MuscleBundle radialBundle = new MuscleBundle("radial");
    for (FemElement3d elem : heart.getElements()) {
        elem.computeCentroid(centroid);
        // project to plane and compute radial direction
        plane.project(centroid, centroid);
        radialDir.sub(centroid, trans.p);
        radialDir.normalize();
        radialBundle.addElement(elem, radialDir);
    }
    radialBundle.setMuscleMaterial(muscleMat);
    heart.addMuscleBundle(radialBundle);
    // -------------------------------------------------------------
    // RIGID TABLE AND COLLISION
    // -------------------------------------------------------------
    // Create a rigid box for the heart to fall on
    RigidBody box = RigidBody.createBox("box", 0.2, 0.2, 0.02, 0, /*addnormals*/
    true);
    box.setPose(new RigidTransform3d(new Vector3d(0, 0, -0.2), AxisAngle.IDENTITY));
    box.setDynamic(false);
    mech.addRigidBody(box);
    // Enable collisions between the heart and table
    mech.setCollisionBehavior(heart, box, true);
    // -------------------------------------------------------------
    // RENDER PROPERTIES
    // -------------------------------------------------------------
    // Hide elements and nodes
    RenderProps.setVisible(heart.getElements(), false);
    RenderProps.setVisible(heart.getNodes(), false);
    RenderProps.setLineColor(radialBundle, Color.BLUE);
    RenderProps.setLineColor(longBundle, Color.RED);
    radialBundle.setDirectionRenderLen(0.1);
    longBundle.setDirectionRenderLen(0.1);
    RenderProps.setVisible(radialBundle, false);
    RenderProps.setVisible(longBundle, false);
    RenderProps.setVisible(heart.getSurfaceMeshComp(), false);
    // adjust table render properties
    RenderProps.setShading(box, Shading.METAL);
    RenderProps.setSpecular(box, new Color(0.8f, 0.8f, 0.8f));
    // adjust heart mesh render properties
    RenderProps rprops = embeddedHeart.getRenderProps();
    rprops.getBumpMap().setScaling(0.01f);
    // don't modify specular
    rprops.getColorMap().setSpecularColoring(false);
    rprops.setShading(Shading.SMOOTH);
    rprops.setFaceColor(new Color(0.8f, 0.8f, 0.8f));
    rprops.getColorMap().setColorMixing(ColorMixing.MODULATE);
    rprops.setSpecular(new Color(0.4f, 0.4f, 0.4f));
    rprops.setShininess(128);
    // -------------------------------------------------------------
    // INPUT PROBES
    // -------------------------------------------------------------
    // Add heart probe
    addHeartProbe(longBundle, radialBundle);
}