How to apply Displacement on object

[bani]

Is there a way to apply displacement on an object (like force can be applied on an object)

Thanks
Vani

[Hugo]

Hey @vanisri

You can use a TranformEngine.
You can find an example scene in: examples/Components/engine/TransformEngine.scn

Best wishes,

Hugo

[bani]

Thank you, what does [-1] refer to in the example?

[Hugo]

Hey @vanisri

Good point, it’s an old notation still working though.
[-1] means the previous component (above in the graph).

In the above example of the TransformeEngine.scn, input_position="@[-1].position" in the TransformEngine means that it gets the position data field from the SparseGridTopology which is defined just before in the node.

I hope this clarifies the example scene.
Best wishes,

Hugo

[bani]

I used Transform Engine similar to the example but it has not been working for me, could you please explain it a little more,

[Hugo]

Hey @vanisri

Could you share the scene so that we can see how you did use / handle it?
Best

Hugo

[bani]

I have attached the file here file

Thanks

[Hugo]

Hey @vanisri

Could you please test changing the lines using the TransformEngine:

 # WALL:
    childw=node.addChild('child wall')
    childw.addObject('MeshGmshLoader', name='wall', filename='E:\Softwares\GmSH\gmsh-4.8.4-Windows64\gmsh-4.8.4-Windows64\wallbig')
    childw.addObject('MeshTopology', name='topology-w', src='@wall')
    childw.addObject('TransformEngine', name='transfengine', template="Vec3d", translation=[-2, 0, 0], input_position='@topology-w.position')
    childw.addObject('MechanicalObject', name='mechobj-w', position="@transfengine.output_position", template='Vec3d', showObject='1')

    childw.addObject('UniformMass', totalMass='1')
    childw.addObject('TriangleFEMForceField', youngModulus='10000000')

    childw.addObject('TriangleCollisionModel')
    childw.addObject('LineCollisionModel')
    childw.addObject('PointCollisionModel')

Two remarks:
– always put the collision models in subnodes for each object and use a mapping to connect the physics to the collision model
– we usually apply forces or enforce the position of few points of a deformable object. Why would you like to apply rigid motion to your deformable body?

Best wishes,

Hugo

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[bani]

Thank you @Hugo, I may have misunderstood the functionality of transform engine, I want to apply a series of displacements one after another, I have tried by applying velocity on the mechanical object, but instead of the complete object moving, just one edge of the wall moves, could you tell me how to correct that

[bani]

Or if there is some other method to apply a series of displacements to the wall so that it collides with the cube object accordingly, kindly let me know.

[Author]

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