PointsFromIndices

This component belongs to the category of Engines. This engine returns positions from given indices.

Input Data

• position: positions of the mechanical object
• indices: indices we want to have corresponding positions

Output Data

• indices_position: positions according to given indices

Examples

An example scene involving the PointsFromIndices engine is available in examples/Component/Engine/Select/PointsFromIndices.scn

Target: Sofa.Component.Engine.Select

namespace: sofa::component::engine::select

parents:

• DataEngine

Data:

Name	Description	Default value
name	object name	unnamed
printLog	if true, emits extra messages at runtime.	0
tags	list of the subsets the objet 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
Inputs
position	Position coordinates of the degrees of freedom
indices	Indices of the points
Outputs
indices_position	Coordinates of the points contained in indices

Links:

Name	Description
context	Graph Node containing this object (or BaseContext::getDefault() if no graph is used)
slaves	Sub-objects used internally by this object
master	nullptr for regular objects, or master object for which this object is one sub-objects

Examples

Component/Engine/Select/PointsFromIndices.scn

XMLPython

<?xml version="1.0" ?>
<Node name="root" gravity="0 -9 1" dt="0.05">
    <RequiredPlugin name="Sofa.Component.Constraint.Projective"/> <!-- Needed to use components [FixedProjectiveConstraint] -->
    <RequiredPlugin name="Sofa.Component.Engine.Select"/> <!-- Needed to use components [BoxROI PointsFromIndices] -->
    <RequiredPlugin name="Sofa.Component.IO.Mesh"/> <!-- Needed to use components [MeshGmshLoader] -->
    <RequiredPlugin name="Sofa.Component.LinearSolver.Iterative"/> <!-- Needed to use components [CGLinearSolver] -->
    <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 [TriangularBendingSprings] -->
    <RequiredPlugin name="Sofa.Component.StateContainer"/> <!-- Needed to use components [MechanicalObject] -->
    <RequiredPlugin name="Sofa.Component.Topology.Container.Dynamic"/> <!-- Needed to use components [TriangleSetGeometryAlgorithms TriangleSetTopologyContainer TriangleSetTopologyModifier] -->
    <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->
    <VisualStyle displayFlags="showForceFields" />
    <DefaultAnimationLoop/>

    <Node name="SquareGravity" gravity="0 -9.81 0">
        <EulerImplicitSolver name="cg_odesolver" printLog="false"  rayleighStiffness="0.1" rayleighMass="0.1" />
        <CGLinearSolver iterations="25" name="linear solver" tolerance="1.0e-9" threshold="1.0e-9" />
        <MeshGmshLoader name="loader" filename="mesh/square3.msh" createSubelements="true"/>
        <MechanicalObject src="@loader" template="Vec3" name="mecaObj" scale3d="10 10 10" restScale="1" />
        <TriangleSetTopologyContainer src="@loader" name="Container" />
        <TriangleSetTopologyModifier name="Modifier" />
        <TriangleSetGeometryAlgorithms template="Vec3" name="GeomAlgo" />
        <DiagonalMass name="default5" massDensity="0.15" />
        <BoxROI template="Vec3" name="FixedROI" box="2 9.5 -0.5 8 10.5 0.5" drawBoxes="1" position="@mecaObj.rest_position" computeTriangles="0" computeTetrahedra="0" computeEdges="0" />
        <FixedProjectiveConstraint template="Vec3" name="default6" indices="@FixedROI.indices" />
        <TriangularFEMForceField template="Vec3" name="FEM" method="large" poissonRatio="0.3" youngModulus="60" />
        <TriangularBendingSprings template="Vec3" name="FEM-Bend" stiffness="300" damping="1" />

        <PointsFromIndices name="PFI" position="@mecaObj.position" indices="10 20 30" />

        <Node name="Selection" >
            <MechanicalObject template="Vec3" position="@../PFI.indices_position" name="SelectedDOFs" showIndices="1" showIndicesScale="0.2"  />
        </Node>

    </Node>
</Node>

def createScene(rootNode):

    root = rootNode.addChild('root', gravity="0 -9 1", dt="0.05")
    root.addObject('RequiredPlugin', name="Sofa.Component.Constraint.Projective")
    root.addObject('RequiredPlugin', name="Sofa.Component.Engine.Select")
    root.addObject('RequiredPlugin', name="Sofa.Component.IO.Mesh")
    root.addObject('RequiredPlugin', name="Sofa.Component.LinearSolver.Iterative")
    root.addObject('RequiredPlugin', name="Sofa.Component.Mass")
    root.addObject('RequiredPlugin', name="Sofa.Component.ODESolver.Backward")
    root.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.FEM.Elastic")
    root.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.Spring")
    root.addObject('RequiredPlugin', name="Sofa.Component.StateContainer")
    root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Dynamic")
    root.addObject('RequiredPlugin', name="Sofa.Component.Visual")
    root.addObject('VisualStyle', displayFlags="showForceFields")
    root.addObject('DefaultAnimationLoop')

    SquareGravity = root.addChild('SquareGravity', gravity="0 -9.81 0")
    SquareGravity.addObject('EulerImplicitSolver', name="cg_odesolver", printLog="false", rayleighStiffness="0.1", rayleighMass="0.1")
    SquareGravity.addObject('CGLinearSolver', iterations="25", name="linear solver", tolerance="1.0e-9", threshold="1.0e-9")
    SquareGravity.addObject('MeshGmshLoader', name="loader", filename="mesh/square3.msh", createSubelements="true")
    SquareGravity.addObject('MechanicalObject', src="@loader", template="Vec3", name="mecaObj", scale3d="10 10 10", restScale="1")
    SquareGravity.addObject('TriangleSetTopologyContainer', src="@loader", name="Container")
    SquareGravity.addObject('TriangleSetTopologyModifier', name="Modifier")
    SquareGravity.addObject('TriangleSetGeometryAlgorithms', template="Vec3", name="GeomAlgo")
    SquareGravity.addObject('DiagonalMass', name="default5", massDensity="0.15")
    SquareGravity.addObject('BoxROI', template="Vec3", name="FixedROI", box="2 9.5 -0.5 8 10.5 0.5", drawBoxes="1", position="@mecaObj.rest_position", computeTriangles="0", computeTetrahedra="0", computeEdges="0")
    SquareGravity.addObject('FixedProjectiveConstraint', template="Vec3", name="default6", indices="@FixedROI.indices")
    SquareGravity.addObject('TriangularFEMForceField', template="Vec3", name="FEM", method="large", poissonRatio="0.3", youngModulus="60")
    SquareGravity.addObject('TriangularBendingSprings', template="Vec3", name="FEM-Bend", stiffness="300", damping="1")
    SquareGravity.addObject('PointsFromIndices', name="PFI", position="@mecaObj.position", indices="10 20 30")

    Selection = SquareGravity.addChild('Selection')
    Selection.addObject('MechanicalObject', template="Vec3", position="@../PFI.indices_position", name="SelectedDOFs", showIndices="1", showIndicesScale="0.2")