Clarification of mapping GUI

Hi @Hugo,

Apologies for the delayed response.
That makes sense, thank you. Unfortunately for some reason I cannot view the normals (I see SEGFAULT errors and SOFA crashes). What should well-oriented normals look like?

Hi @Hugo,

I added TetrahedronSetTopologyModifier, though SOFA still crashes with the same SEGFAULT errors when I try to view the normals using the SOFA GUI.

The mesh files I’m using are here (the pneunet files are the ones I’m trying to view normals of): drive link

Here is how my scene is organized:

<root node>
    <FreeMotionAnimationLoop />
    <GenericConstraintSolver />
    <DefaultPipeline />
    <BruteForceDetection />
    <MinProximityIntersection />
    <DefaultContactManager />

    <pneunet node>
        <EulerImplicitSolver />
        <SparseLDLSolver />
        <MeshVTKLoader />
        <TetrahedronSetTopologyContainer />
        <TetrahedronSetTopologyModifier />
        <TetrahedronSetGeometryAlgorithms />
        <MechanicalObject />
        <UniformMass />
        <TetrahedronFEMForceField />

        <BoxROI>
        <stiffLayer node>
            <TetrahedronSetTopologyContainer />
            <TetrahedronSetTopologyModifier />
            <TetrahedronSetGeometryAlgorithms />
            <TetrahedronFEMForceField />
        </node>
        <LinearSolverConstraintCorrection />

        <cavity node>
            <MeshSTLLoader />
            <Mesh />
            <MechanicalObject />
            <SurfacePressureConstraint />
            <BarycentricMapping />
        </node>

        <pneunet collision node>
            <MeshSTLLoader />
            <Mesh />
            <MechanicalObject />
            <TriangleCollisionModel />
            <Line />
            <Point />
            <BarycentricMapping />
        </node>
    </node>
</node>

Let me know if any additional info would help; I can definitely share the full scene file but I’d have to clean it up and simplify it (e.g. not use absolute file paths) first

Hi @Hugo,

The scene file and object files are here: https://github.com/thomaswxu/SOFA
I’m not sure how to save the crash log; is that saved by adding a “printLog” argument to one of the SOFA components?

The purpose of the stiffLayer node is to make the bottom layer of the pneunet object have a higher stiffness/elastic modulus. (It mimics a real-life pneunet prototype which has a paper layer on the bottom.)

Please feel free to contact me if you experience any issues running the scene!

Hi @Hugo,

Apologies for the issues with the scenes.

I’ve uploaded a simplified version of the scene to the same GitHub repo linked above, could you please try running that?
Link: github.com/thomaswxu/SOFA/blob/main/scenes/singleFinger_wObject_simple.pyscn

It should be self-contained and shouldn’t require extra plugins outside of default SOFA, though it does assume the same file/folder layout as in the GitHub repo. Please feel free to contact me if you experience any other issues getting the scene to run.

Hi @Hugo,

No problem; I’m glad the scene is working on your end!

The original issue was that the pneunet object was bending in an unexpected direction. You recommended viewing the normals using the SOFA GUI to see if they are well oriented, though when I try viewing the normals the scene immediately crashes (SIG11 SIGSEGV segfault).

Are you able to view the normals on your end?