Laboratoire RDP » Biophysics Team » AFM_plane

import Sofa

poissonRatio = 0.49

youngModulus = 100

pressure = 5

indentorRadius = 0.3

def createScene(node): 

    print 'Creation of Sofa SceneGraph'    

    node.gravity = [0,0,0]

    node.createObject('RequiredPlugin', pluginName="Flexible") 

    node.createObject('VisualStyle', displayFlags = 'showVisual hideBehavior showCollisionModels')

    node.createObject('DefaultPipeline', name="DefaultCollisionPipeline",  verbose="0",  draw="0",  depth="6")

    node.createObject('BruteForceDetection', name="Detection")

    node.createObject('MinProximityIntersection', name="Proximity",  alarmDistance="0.1",  contactDistance="0.0")

    node.createObject('DefaultContactManager', name="Response",  response="default", responseParams="")

    node.createObject('TreeCollisionGroupManager', name="Group")

    node.createObject('CGLinearSolver', template="GraphScattered",iterations=500,threshold=1e-10,tolerance=1e-10)

    node.createObject('EulerImplicitSolver', rayleighStiffness=0.5,rayleighMass=0.5)

    node.createObject('GridMeshCreator', name='Grid', resolution="10 10", triangulate=1)

    node.createObject('MeshTopology', name='Topology',src="@Grid")

    node.createObject('MechanicalObject', name='DOFs', template="Vec3d")    

    node.createObject('UniformMass',name='mass', template='Vec3d')

    node.createObject('FixedConstraint',template="Vec3d", indices="0 9 90 99" )

    ## Pressure

    node.createObject("SurfacePressureForceField",  pressure=pressure)

    ## Deformation, Stress and Strain

    node.createObject('BarycentricShapeFunction', template="ShapeFunctiond")

    deformation = node.createChild("deformation")

    deformation.createObject('TopologyGaussPointSampler',name='sampler', inPosition='@../Topology.position' , showSamples="false", method="0", order="1" )

    deformation.createObject('MechanicalObject', name='deform', template='F321')

    deformation.createObject('LinearMapping', template='Vec3d,F321')

    stressStrain = deformation.createChild('stressStrain')

    stressStrain.createObject('MechanicalObject', name='Strain',template='E321')

    stressStrain.createObject('CorotationalStrainMapping', template="F321,E321")

    stressStrain.createObject('HookeForceField', template="E321", youngModulus=youngModulus,poissonRatio=poissonRatio, viscosity=0  )

    ## Collision

    node.createObject('TriangleModel',contactStiffness=1000)

    node.createObject('LineModel',contactStiffness=1000)

    node.createObject('PointModel',contactStiffness=1000)

    Visu = node.createChild('Visu')

    Visu.createObject('OglModel')

    Visu.createObject('IdentityMapping', template='Vec3d,ExtVec3f')

    ## indentor

    indentor = node.createChild('indentor')

    indentor.createObject('MechanicalObject',name='indentor', position="0.5 0.5 2")

    indentor.createObject('UniformMass')

    indentor.createObject('ConstantForceField', points=0, force="0 0 -1")

    indentor.createObject('TSphereModel', radius= indentorRadius, ContactStiffness=1000) 

    indentor.createObject('ProjectToLineConstraint',endTime='-1', indices=0, origin="0.5 0.5 2", direction="0 0 1") 

    indentor.createObject('PointConstraint', endTime=3, indices=0)