QuadBendingSprings
Springs added to a quad mesh to prevent bending Supports GPU-side computations using CUDA
Templates:
Vec2dVec3d
Target: Sofa.Component.SolidMechanics.Spring
namespace: sofa::component::solidmechanics::spring
parents:
StiffSpringForceField
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 |
| isCompliance | Consider the component as a compliance, else as a stiffness | 0 |
| rayleighStiffness | Rayleigh damping - stiffness matrix coefficient | 0 |
| stiffness | uniform stiffness for the all springs | 100 |
| damping | uniform damping for the all springs | 5 |
| spring | pairs of indices, stiffness, damping, rest length | |
| springsIndices1 | List of indices in springs from the first mstate | |
| springsIndices2 | List of indices in springs from the second mstate | |
| indices1 | Indices of the source points on the first model | |
| indices2 | Indices of the fixed points on the second model | |
| lengths | List of lengths to create the springs. Must have the same than indices1 & indices2, or if only one element, it will be applied to all springs. If empty, 0 will be applied everywhere | |
| localRange | optional range of local DOF indices. Any computation involving only indices outside of this range are discarded (useful for parallelization using mesh partitionning) | -1 -1 |
| Visualization | ||
| showArrowSize | size of the axis | 0.01 |
| drawMode | The way springs will be drawn: - 0: Line - 1:Cylinder - 2: Arrow | 0 |
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 |
| mechanicalStates | List of mechanical states to which this component is associated |
| object1 | First object associated to this component |
| object2 | Second object associated to this component |
| topology | link to the topology container |
Examples
Component/SolidMechanics/Spring/QuadBendingSprings.scn
<?xml version="1.0" ?>
<Node name="root" gravity="0.0 -2.0 0.0" dt="0.04">
<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 [NewProximityIntersection] -->
<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.LinearSolver.Iterative"/> <!-- Needed to use components [CGLinearSolver] -->
<RequiredPlugin name="Sofa.Component.Mapping.Linear"/> <!-- Needed to use components [IdentityMapping] -->
<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.Spring"/> <!-- Needed to use components [MeshSpringForceField QuadBendingSprings] -->
<RequiredPlugin name="Sofa.Component.StateContainer"/> <!-- Needed to use components [MechanicalObject] -->
<RequiredPlugin name="Sofa.Component.Topology.Container.Grid"/> <!-- Needed to use components [RegularGridTopology] -->
<RequiredPlugin name="Sofa.GL.Component.Rendering3D"/> <!-- Needed to use components [OglModel] -->
<CollisionPipeline verbose="0" />
<BruteForceBroadPhase/>
<BVHNarrowPhase/>
<CollisionResponse name="Response" />
<DefaultAnimationLoop/>
<NewProximityIntersection alarmDistance="0.002" contactDistance="0.001" />
<Node name="SquareCloth1">
<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" />
<RegularGridTopology nx="20" ny="1" nz="20" xmin="12" xmax="-12" ymin="7" ymax="7" zmin="-12" zmax="12" />
<MechanicalObject />
<UniformMass totalMass="100" />
<MeshSpringForceField name="Springs" stiffness="1000" damping="0" />
<QuadBendingSprings name="Bend" stiffness="2000" damping="1" />
<FixedProjectiveConstraint name="FixedProjectiveConstraint" indices="0 19" />
<Node name="Visu">
<OglModel name="Visual" color="green" />
<IdentityMapping input="@.." output="@Visual" />
</Node>
<Node name="Surf">
<MechanicalObject />
<RegularGridTopology nx="20" ny="1" nz="20" xmin="12" xmax="-12" ymin="7" ymax="7" zmin="-12" zmax="12" />
<IdentityMapping />
<TriangleCollisionModel />
</Node>
</Node>
</Node>
def createScene(rootNode):
root = rootNode.addChild('root', gravity="0.0 -2.0 0.0", dt="0.04")
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.LinearSolver.Iterative")
root.addObject('RequiredPlugin', name="Sofa.Component.Mapping.Linear")
root.addObject('RequiredPlugin', name="Sofa.Component.Mass")
root.addObject('RequiredPlugin', name="Sofa.Component.ODESolver.Backward")
root.addObject('RequiredPlugin', name="Sofa.Component.SolidMechanics.Spring")
root.addObject('RequiredPlugin', name="Sofa.Component.StateContainer")
root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Container.Grid")
root.addObject('RequiredPlugin', name="Sofa.GL.Component.Rendering3D")
root.addObject('CollisionPipeline', verbose="0")
root.addObject('BruteForceBroadPhase')
root.addObject('BVHNarrowPhase')
root.addObject('CollisionResponse', name="Response")
root.addObject('DefaultAnimationLoop')
root.addObject('NewProximityIntersection', alarmDistance="0.002", contactDistance="0.001")
SquareCloth1 = root.addChild('SquareCloth1')
SquareCloth1.addObject('EulerImplicitSolver', name="cg_odesolver", printLog="false", rayleighStiffness="0.1", rayleighMass="0.1")
SquareCloth1.addObject('CGLinearSolver', iterations="25", name="linear solver", tolerance="1.0e-9", threshold="1.0e-9")
SquareCloth1.addObject('RegularGridTopology', nx="20", ny="1", nz="20", xmin="12", xmax="-12", ymin="7", ymax="7", zmin="-12", zmax="12")
SquareCloth1.addObject('MechanicalObject')
SquareCloth1.addObject('UniformMass', totalMass="100")
SquareCloth1.addObject('MeshSpringForceField', name="Springs", stiffness="1000", damping="0")
SquareCloth1.addObject('QuadBendingSprings', name="Bend", stiffness="2000", damping="1")
SquareCloth1.addObject('FixedProjectiveConstraint', name="FixedProjectiveConstraint", indices="0 19")
Visu = SquareCloth1.addChild('Visu')
Visu.addObject('OglModel', name="Visual", color="green")
Visu.addObject('IdentityMapping', input="@..", output="@Visual")
Surf = SquareCloth1.addChild('Surf')
Surf.addObject('MechanicalObject')
Surf.addObject('RegularGridTopology', nx="20", ny="1", nz="20", xmin="12", xmax="-12", ymin="7", ymax="7", zmin="-12", zmax="12")
Surf.addObject('IdentityMapping')
Surf.addObject('TriangleCollisionModel')