QuadularBendingSprings

Springs added to a quad mesh to prevent bending.

Vec3d

Templates:

• Vec3d

Target: Sofa.Component.SolidMechanics.Spring

namespace: sofa::component::solidmechanics::spring

parents:

• ForceField

Data

Name	Description	Default value
name	object name	unnamed
printLog	if true, emits extra messages at runtime.	0
tags	list of the subsets the object belongs to
bbox	this object bounding box
componentState	The state of the component among (Dirty, Valid, Undefined, Loading, Invalid).	Undefined
listening	if true, handle the events, otherwise ignore the events	0
rayleighStiffness	Rayleigh damping - stiffness matrix coefficient	0
stiffness	uniform stiffness for the all springs	100000
damping	uniform damping for the all springs	1
edgeInfo	Internal edge data

Links

Name	Description	Destination type name
context	Graph Node containing this object (or BaseContext::getDefault() if no graph is used)	BaseContext
slaves	Sub-objects used internally by this object	BaseObject
master	nullptr for regular objects, or master object for which this object is one sub-objects	BaseObject
mechanicalStates	List of mechanical states to which this component is associated	BaseMechanicalState
mstate	MechanicalState used by this component	MechanicalState<Vec3d>
topology	link to the topology container	BaseMeshTopology

Examples

QuadularBendingSprings.scn

XMLPython

<Node name="root" dt="0.005" showBoundingTree="0" gravity="0 -9.81 0">
    <Node name="plugins">
        <RequiredPlugin name="Sofa.Component.Constraint.Projective"/> <!-- Needed to use components [FixedProjectiveConstraint] -->
        <RequiredPlugin name="Sofa.Component.Engine.Select"/> <!-- Needed to use components [BoxROI] -->
        <RequiredPlugin name="Sofa.Component.LinearSolver.Direct"/> <!-- Needed to use components [EigenSimplicialLDLT] -->
        <RequiredPlugin name="Sofa.Component.Mapping.Linear"/> <!-- Needed to use components [IdentityMapping] -->
        <RequiredPlugin name="Sofa.Component.Mass"/> <!-- Needed to use components [DiagonalMass] -->
        <RequiredPlugin name="Sofa.Component.ODESolver.Backward"/> <!-- Needed to use components [EulerImplicitSolver] -->
        <RequiredPlugin name="Sofa.Component.SolidMechanics.FEM.Elastic"/> <!-- Needed to use components [TriangularFEMForceField] -->
        <RequiredPlugin name="Sofa.Component.SolidMechanics.Spring"/> <!-- Needed to use components [QuadularBendingSprings] -->
        <RequiredPlugin name="Sofa.Component.StateContainer"/> <!-- Needed to use components [MechanicalObject] -->
        <RequiredPlugin name="Sofa.Component.Topology.Container.Dynamic"/> <!-- Needed to use components [QuadSetTopologyContainer TriangleSetTopologyContainer TriangleSetTopologyModifier] -->
        <RequiredPlugin name="Sofa.Component.Topology.Container.Grid"/> <!-- Needed to use components [RegularGridTopology] -->
        <RequiredPlugin name="Sofa.Component.Topology.Mapping"/> <!-- Needed to use components [Quad2TriangleTopologicalMapping] -->
        <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->
        <RequiredPlugin name="Sofa.GL.Component.Rendering3D"/> <!-- Needed to use components [OglModel] -->
    </Node>

    <DefaultAnimationLoop/>
    <VisualStyle displayFlags="showBehaviorModels showWireframe" />
    <Node name="QuadularSprings">
        <EulerImplicitSolver name="cg_odesolver" printLog="false"  rayleighStiffness="0.1" rayleighMass="0.1" />
        <EigenSimplicialLDLT name="linearSolver" template="CompressedRowSparseMatrixMat3x3"/>
        <RegularGridTopology min="0 0 0" max="1 0 1" nx="20" ny="1" nz="20" name="grid" />
        <MechanicalObject name="Quads" />
        <QuadSetTopologyContainer name="Container" quads="@grid.quads"/>
        <QuadularBendingSprings name="FEM-Bend" stiffness="3000" damping="1.0" topology="@Container" draw="true"/>
        <DiagonalMass massDensity="1.5" />
        <BoxROI box="-0.0001 -0.0001 -0.0001 0.0001 0.0001 0.0001  0.999 -0.0001 -0.0001 1.0001 0.0001 0.0001" name="box"/>
        <FixedProjectiveConstraint indices="@box.indices" />
        <Node name="Surf">
            <TriangleSetTopologyContainer name="Container"/>
            <TriangleSetTopologyModifier name="Modifier" />
            <Quad2TriangleTopologicalMapping input="@../Container" output="@Container" />
            <TriangularFEMForceField name="FEM" youngModulus="1000" poissonRatio="0.3" method="large" />
        </Node>
        <Node name="Visu">
            <OglModel name="Visual" color="yellow" />
            <IdentityMapping input="@../Quads" output="@Visual" />
        </Node>
    </Node>
</Node>

def createScene(root_node):

   root = root_node.addChild('root', dt="0.005", showBoundingTree="0", gravity="0 -9.81 0")

   plugins = root.addChild('plugins')

   plugins.addObject('RequiredPlugin', name="Sofa.Component.Constraint.Projective")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Engine.Select")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.LinearSolver.Direct")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Mapping.Linear")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Mass")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.ODESolver.Backward")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.FEM.Elastic")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.Spring")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.StateContainer")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Dynamic")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Grid")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Topology.Mapping")
   plugins.addObject('RequiredPlugin', name="Sofa.Component.Visual")
   plugins.addObject('RequiredPlugin', name="Sofa.GL.Component.Rendering3D")

   root.addObject('DefaultAnimationLoop', )
   root.addObject('VisualStyle', displayFlags="showBehaviorModels showWireframe")

   quadular_springs = root.addChild('QuadularSprings')

   quadular_springs.addObject('EulerImplicitSolver', name="cg_odesolver", printLog="false", rayleighStiffness="0.1", rayleighMass="0.1")
   quadular_springs.addObject('EigenSimplicialLDLT', name="linearSolver", template="CompressedRowSparseMatrixMat3x3")
   quadular_springs.addObject('RegularGridTopology', min="0 0 0", max="1 0 1", nx="20", ny="1", nz="20", name="grid")
   quadular_springs.addObject('MechanicalObject', name="Quads")
   quadular_springs.addObject('QuadSetTopologyContainer', name="Container", quads="@grid.quads")
   quadular_springs.addObject('QuadularBendingSprings', name="FEM-Bend", stiffness="3000", damping="1.0", topology="@Container", draw="true")
   quadular_springs.addObject('DiagonalMass', massDensity="1.5")
   quadular_springs.addObject('BoxROI', box="-0.0001 -0.0001 -0.0001 0.0001 0.0001 0.0001  0.999 -0.0001 -0.0001 1.0001 0.0001 0.0001", name="box")
   quadular_springs.addObject('FixedProjectiveConstraint', indices="@box.indices")

   surf = QuadularSprings.addChild('Surf')

   surf.addObject('TriangleSetTopologyContainer', name="Container")
   surf.addObject('TriangleSetTopologyModifier', name="Modifier")
   surf.addObject('Quad2TriangleTopologicalMapping', input="@../Container", output="@Container")
   surf.addObject('TriangularFEMForceField', name="FEM", youngModulus="1000", poissonRatio="0.3", method="large")

   visu = QuadularSprings.addChild('Visu')

   visu.addObject('OglModel', name="Visual", color="yellow")
   visu.addObject('IdentityMapping', input="@../Quads", output="@Visual")