ValuesFromPositions

Assign values to primitives (vertex/edge/triangle/tetrahedron) based on a linear interpolation of values along a direction.

Templates:

• Rigid3d
• Vec3d

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 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
fieldType	field type of output elements
Inputs
inputValues	Input values
direction	Direction along which the values are interpolated	0 1 0
position	Rest position coordinates of the degrees of freedom
edges	Edge Topology
triangles	Triangle Topology
tetrahedra	Tetrahedron Topology
Outputs
values	Values of the points contained in the ROI
edgeValues	Values of the edges contained in the ROI
triangleValues	Values of the triangles contained in the ROI
tetrahedronValues	Values of the tetrahedra contained in the ROI
pointVectors	Vectors of the points contained in the ROI
edgeVectors	Vectors of the edges contained in the ROI
triangleVectors	Vectors of the triangles contained in the ROI
tetrahedronVectors	Vectors of the tetrahedra contained in the ROI
Visualization
drawVectors	draw vectors line	0
drawVectorLength	vector length visualisation.	10

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

Examples

ValuesFromPositions_vectorField.scn

XMLPython

<?xml version="1.0" ?>
<Node name="Root" gravity="0 0 0" dt="0.02">
    <RequiredPlugin name="Sofa.Component.Collision.Detection.Algorithm"/> <!-- Needed to use components [BVHNarrowPhase BruteForceBroadPhase CollisionPipeline] -->
    <RequiredPlugin name="Sofa.Component.Collision.Detection.Intersection"/> <!-- Needed to use components [MinProximityIntersection] -->
    <RequiredPlugin name="Sofa.Component.Collision.Geometry"/> <!-- Needed to use components [TriangleCollisionModel] -->
    <RequiredPlugin name="Sofa.Component.Collision.Response.Contact"/> <!-- Needed to use components [CollisionResponse] -->
    <RequiredPlugin name="Sofa.Component.Constraint.Projective"/> <!-- Needed to use components [FixedProjectiveConstraint] -->
    <RequiredPlugin name="Sofa.Component.Engine.Select"/> <!-- Needed to use components [BoxROI ValuesFromPositions] -->
    <RequiredPlugin name="Sofa.Component.LinearSolver.Iterative"/> <!-- Needed to use components [CGLinearSolver] -->
    <RequiredPlugin name="Sofa.Component.Mass"/> <!-- Needed to use components [UniformMass] -->
    <RequiredPlugin name="Sofa.Component.ODESolver.Backward"/> <!-- Needed to use components [EulerImplicitSolver] -->
    <RequiredPlugin name="Sofa.Component.SolidMechanics.FEM.Elastic"/> <!-- Needed to use components [TetrahedronFEMForceField] -->
    <RequiredPlugin name="Sofa.Component.StateContainer"/> <!-- Needed to use components [MechanicalObject] -->
    <RequiredPlugin name="Sofa.Component.Topology.Container.Dynamic"/> <!-- Needed to use components [TetrahedronSetGeometryAlgorithms TetrahedronSetTopologyContainer TetrahedronSetTopologyModifier] -->
    <RequiredPlugin name="Sofa.Component.Topology.Container.Grid"/> <!-- Needed to use components [RegularGridTopology] -->
    <RequiredPlugin name="Sofa.Component.Topology.Mapping"/> <!-- Needed to use components [Hexa2TetraTopologicalMapping] -->
    <RequiredPlugin name="Sofa.Component.Visual"/> <!-- Needed to use components [VisualStyle] -->

    <DefaultAnimationLoop/>
    <VisualStyle displayFlags="showVisual showBehaviorModels showForceFields showCollision showMapping" />
    <CollisionPipeline name="DefaultCollisionPipeline" verbose="0" draw="0" depth="6" />
    <BruteForceBroadPhase/>
    <BVHNarrowPhase/>
    <MinProximityIntersection name="Proximity" alarmDistance="0.3" contactDistance="0.2" />
    <CollisionResponse name="Response" response="PenalityContactForceField" />
    <Node name="Cube" gravity="0 -9.81 0">
        <EulerImplicitSolver name="cg_odesolver" printLog="0"  rayleighStiffness="0.1" rayleighMass="0.1" />
        <CGLinearSolver template="GraphScattered" name="linear solver" iterations="25" tolerance="1e-09" threshold="1e-09" />
        <RegularGridTopology name="grid" n="6 6 6" min="-10 -10 -10" max="10 10 10" p0="-10 -10 -10" />
        <MechanicalObject template="Vec3" name="mecaObj" src="@grid"/>
        <UniformMass name="default25" vertexMass="0.25" />
        <TetrahedronFEMForceField template="Vec3" name="FEM" method="large" poissonRatio="0.4" youngModulus="1000" computeGlobalMatrix="0" />
        <BoxROI template="Vec3" name="box_roi" box="-11 -11 -11 11 -9 11" indices="0" drawSize="0" />
        <FixedProjectiveConstraint template="Vec3" name="default27" indices="@box_roi.indices" drawSize="0" />
        <Node name="Tetra" gravity="0 -9.81 0">
            <TetrahedronSetTopologyContainer name="Container" />
            <TetrahedronSetTopologyModifier name="Modifier" />
            <TetrahedronSetGeometryAlgorithms template="Vec3" name="GeomAlgo" />
            <TriangleCollisionModel template="Vec3" name="default30" />
            <Hexa2TetraTopologicalMapping name="default28" input="@../grid" output="@Container" />
            <Node name="interpol" gravity="0 -9.81 0">
                <ValuesFromPositions template="Vec3" direction="1 1 0" position="@../../mecaObj.position" fieldType="Vector" drawVectors="1" drawVectorLength="5" />
            </Node>
        </Node>
    </Node>
</Node>

def createScene(root_node):

   root = root_node.addChild('Root', gravity="0 0 0", dt="0.02")

   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Detection.Algorithm")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Detection.Intersection")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Geometry")
   root.addObject('RequiredPlugin', name="Sofa.Component.Collision.Response.Contact")
   root.addObject('RequiredPlugin', name="Sofa.Component.Constraint.Projective")
   root.addObject('RequiredPlugin', name="Sofa.Component.Engine.Select")
   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.StateContainer")
   root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Dynamic")
   root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Grid")
   root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Mapping")
   root.addObject('RequiredPlugin', name="Sofa.Component.Visual")
   root.addObject('DefaultAnimationLoop', )
   root.addObject('VisualStyle', displayFlags="showVisual showBehaviorModels showForceFields showCollision showMapping")
   root.addObject('CollisionPipeline', name="DefaultCollisionPipeline", verbose="0", draw="0", depth="6")
   root.addObject('BruteForceBroadPhase', )
   root.addObject('BVHNarrowPhase', )
   root.addObject('MinProximityIntersection', name="Proximity", alarmDistance="0.3", contactDistance="0.2")
   root.addObject('CollisionResponse', name="Response", response="PenalityContactForceField")

   cube = Root.addChild('Cube', gravity="0 -9.81 0")

   cube.addObject('EulerImplicitSolver', name="cg_odesolver", printLog="0", rayleighStiffness="0.1", rayleighMass="0.1")
   cube.addObject('CGLinearSolver', template="GraphScattered", name="linear solver", iterations="25", tolerance="1e-09", threshold="1e-09")
   cube.addObject('RegularGridTopology', name="grid", n="6 6 6", min="-10 -10 -10", max="10 10 10", p0="-10 -10 -10")
   cube.addObject('MechanicalObject', template="Vec3", name="mecaObj", src="@grid")
   cube.addObject('UniformMass', name="default25", vertexMass="0.25")
   cube.addObject('TetrahedronFEMForceField', template="Vec3", name="FEM", method="large", poissonRatio="0.4", youngModulus="1000", computeGlobalMatrix="0")
   cube.addObject('BoxROI', template="Vec3", name="box_roi", box="-11 -11 -11 11 -9 11", indices="0", drawSize="0")
   cube.addObject('FixedProjectiveConstraint', template="Vec3", name="default27", indices="@box_roi.indices", drawSize="0")

   tetra = Cube.addChild('Tetra', gravity="0 -9.81 0")

   tetra.addObject('TetrahedronSetTopologyContainer', name="Container")
   tetra.addObject('TetrahedronSetTopologyModifier', name="Modifier")
   tetra.addObject('TetrahedronSetGeometryAlgorithms', template="Vec3", name="GeomAlgo")
   tetra.addObject('TriangleCollisionModel', template="Vec3", name="default30")
   tetra.addObject('Hexa2TetraTopologicalMapping', name="default28", input="@../grid", output="@Container")

   interpol = Tetra.addChild('interpol', gravity="0 -9.81 0")

   interpol.addObject('ValuesFromPositions', template="Vec3", direction="1 1 0", position="@../../mecaObj.position", fieldType="Vector", drawVectors="1", drawVectorLength="5")