FFDDistanceGridCollisionModel
Grid-based deformable distance field
Target: SofaDistanceGrid
namespace: sofa::component::collision
parents:
- CollisionModel
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 |
| active | flag indicating if this collision model is active and should be included in default collision detections | 1 |
| moving | flag indicating if this object is changing position between iterations | 1 |
| simulated | flag indicating if this object is controlled by a simulation | 1 |
| selfCollision | flag indication if the object can self collide | 0 |
| proximity | Distance to the actual (visual) surface | 0 |
| contactStiffness | Contact stiffness | 10 |
| contactFriction | Contact friction coefficient (dry or viscous or unused depending on the contact method) | 0 |
| contactRestitution | Contact coefficient of restitution | 0 |
| contactResponse | if set, indicate to the ContactManager that this model should use the given class of contacts. Note that this is only indicative, and in particular if both collision models specify a different class it is up to the manager to choose. | |
| color | color used to display the collision model if requested | 1 0 0 1 |
| group | IDs of the groups containing this model. No collision can occur between collision models included in a common group (e.g. allowing the same object to have multiple collision models) | |
| numberOfContacts | Number of collision models this collision model is currently attached to | 0 |
| filename | Load distance grid from specified file | |
| scale | scaling factor for input file | 1 |
| sampling | if not zero: sample the surface with points approximately separated by the given sampling distance (expressed in voxels if the value is negative) | 0 |
| box | Field bounding box defined by xmin,ymin,zmin, xmax,ymax,zmax | |
| nx | number of values on X axis | 64 |
| ny | number of values on Y axis | 64 |
| nz | number of values on Z axis | 64 |
| dumpfilename | write distance grid to specified file | |
| usePoints | use mesh vertices for collision detection | 1 |
| singleContact | keep only the deepest contact in each cell | 0 |
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 |
| previous | Previous (coarser / upper / parent level) CollisionModel in the hierarchy. | CollisionModel |
| next | Next (finer / lower / child level) CollisionModel in the hierarchy. | CollisionModel |
| collisionElementActiver | CollisionElementActiver component that activates or deactivates collision element(s) during execution | BaseObject |
Examples
FFDDistanceGridCollisionModel.scn
<?xml version="1.0"?>
<Node name="root" dt="0.005" gravity="0.0 -9.81 0">
<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 [DiscreteIntersection] -->
<RequiredPlugin name="Sofa.Component.Collision.Geometry"/> <!-- Needed to use components [PointCollisionModel 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] -->
<RequiredPlugin name="Sofa.Component.IO.Mesh"/> <!-- Needed to use components [MeshOBJLoader] -->
<RequiredPlugin name="Sofa.Component.LinearSolver.Iterative"/> <!-- Needed to use components [CGLinearSolver] -->
<RequiredPlugin name="Sofa.Component.Mapping.Linear"/> <!-- Needed to use components [BarycentricMapping 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.FEM.Elastic"/> <!-- Needed to use components [HexahedronFEMForceField 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.Topology.Container.Grid"/> <!-- Needed to use components [RegularGridTopology SparseGridTopology] -->
<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] -->
<RequiredPlugin name="SofaDistanceGrid"/> <!-- Needed to use components [FFDDistanceGridCollisionModel] -->
<CollisionPipeline name="pipeline" depth="6" verbose="0" />
<BruteForceBroadPhase/>
<BVHNarrowPhase/>
<CollisionResponse name="response" response="PenalityContactForceField" />
<DiscreteIntersection name="proximity" />
<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" />
<Node name="DeformableLiver">
<VisualStyle displayFlags="showForceFields" />
<MechanicalObject />
<UniformMass totalMass="1000.0" />
<SparseGridTopology n="8 6 6" fileTopology="mesh/liver-smooth.obj" />
<BoxROI name="box1" box="-2.5 0 -2.5 7.5 3 2" />
<FixedProjectiveConstraint indices="@box1.indices"/>
<HexahedronFEMForceField poissonRatio="0" youngModulus="7000"/>
<FFDDistanceGridCollisionModel fileFFDDistanceGrid="mesh/liver-smooth.obj" scale="1.0" usePoints="0" proximity="0.1" contactStiffness="500.0" contactFriction="0.0" />
<Node name="Visu">
<MeshOBJLoader name="meshLoader_0" filename="mesh/liver-smooth.obj" translation="0 0 0" handleSeams="1" />
<OglModel name="Visual" src="@meshLoader_0" color="red" />
<BarycentricMapping input="@.." output="@Visual" />
</Node>
</Node>
<Node name="Cloth">
<VisualStyle displayFlags="hideForceFields" />
<RegularGridTopology nx="50" ny="1" nz="50" xmin="-6" xmax="2" ymin="6" ymax="6" zmin="-4" zmax="4" name="Container" />
<MechanicalObject name="dofs" />
<UniformMass totalMass="100" />
<Node name="T">
<include href="Objects/TriangleSetTopology.xml" />
<Quad2TriangleTopologicalMapping input="@../Container" output="@Container" />
<TriangularFEMForceField name="FEM" youngModulus="60" poissonRatio="0.3" method="large" />
<TriangularBendingSprings name="FEM-Bend" stiffness="300" damping="1.0" />
<TriangleCollisionModel />
<PointCollisionModel />
<Node name="Visu">
<OglModel name="Visual" material="mat1 Diffuse 1 0.5 1.0 0.75 0.8 Ambient 1 0.2 0.2 0.2 1 Specular 1 0.6 0.6 0.6 0.6 Emissive 0 0 0 0 0 Shininess 0 45" />
<IdentityMapping input="@../../dofs" output="@Visual" />
</Node>
</Node>
</Node>
</Node>
def createScene(root_node):
root = root_node.addChild('root', dt="0.005", gravity="0.0 -9.81 0")
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.IO.Mesh")
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.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.Topology.Container.Grid")
root.addObject('RequiredPlugin', name="Sofa.Component.Topology.Mapping")
root.addObject('RequiredPlugin', name="Sofa.Component.Visual")
root.addObject('RequiredPlugin', name="Sofa.GL.Component.Rendering3D")
root.addObject('RequiredPlugin', name="SofaDistanceGrid")
root.addObject('CollisionPipeline', name="pipeline", depth="6", verbose="0")
root.addObject('BruteForceBroadPhase', )
root.addObject('BVHNarrowPhase', )
root.addObject('CollisionResponse', name="response", response="PenalityContactForceField")
root.addObject('DiscreteIntersection', name="proximity")
root.addObject('EulerImplicitSolver', name="cg_odesolver", printLog="false", rayleighStiffness="0.1", rayleighMass="0.1")
root.addObject('CGLinearSolver', iterations="25", name="linear solver", tolerance="1.0e-9", threshold="1.0e-9")
deformable_liver = root.addChild('DeformableLiver')
deformable_liver.addObject('VisualStyle', displayFlags="showForceFields")
deformable_liver.addObject('MechanicalObject', )
deformable_liver.addObject('UniformMass', totalMass="1000.0")
deformable_liver.addObject('SparseGridTopology', n="8 6 6", fileTopology="mesh/liver-smooth.obj")
deformable_liver.addObject('BoxROI', name="box1", box="-2.5 0 -2.5 7.5 3 2")
deformable_liver.addObject('FixedProjectiveConstraint', indices="@box1.indices")
deformable_liver.addObject('HexahedronFEMForceField', poissonRatio="0", youngModulus="7000")
deformable_liver.addObject('FFDDistanceGridCollisionModel', fileFFDDistanceGrid="mesh/liver-smooth.obj", scale="1.0", usePoints="0", proximity="0.1", contactStiffness="500.0", contactFriction="0.0")
visu = DeformableLiver.addChild('Visu')
visu.addObject('MeshOBJLoader', name="meshLoader_0", filename="mesh/liver-smooth.obj", translation="0 0 0", handleSeams="1")
visu.addObject('OglModel', name="Visual", src="@meshLoader_0", color="red")
visu.addObject('BarycentricMapping', input="@..", output="@Visual")
cloth = root.addChild('Cloth')
cloth.addObject('VisualStyle', displayFlags="hideForceFields")
cloth.addObject('RegularGridTopology', nx="50", ny="1", nz="50", xmin="-6", xmax="2", ymin="6", ymax="6", zmin="-4", zmax="4", name="Container")
cloth.addObject('MechanicalObject', name="dofs")
cloth.addObject('UniformMass', totalMass="100")
t = Cloth.addChild('T')
t.addObject('include', href="Objects/TriangleSetTopology.xml")
t.addObject('Quad2TriangleTopologicalMapping', input="@../Container", output="@Container")
t.addObject('TriangularFEMForceField', name="FEM", youngModulus="60", poissonRatio="0.3", method="large")
t.addObject('TriangularBendingSprings', name="FEM-Bend", stiffness="300", damping="1.0")
t.addObject('TriangleCollisionModel', )
t.addObject('PointCollisionModel', )
visu = T.addChild('Visu')
visu.addObject('OglModel', name="Visual", material="mat1 Diffuse 1 0.5 1.0 0.75 0.8 Ambient 1 0.2 0.2 0.2 1 Specular 1 0.6 0.6 0.6 0.6 Emissive 0 0 0 0 0 Shininess 0 45")
visu.addObject('IdentityMapping', input="@../../dofs", output="@Visual")