Sarah

Hi Hugo and Erik!
Thanks for all the tips, has been helpful. Also it is very cool to see the documentation and other options expand. Yes, I’ll close the topic. I think it has been resolved.

Best,

Sarah

Hi Hugo,

I looked into some of the code of the AdvancedTimer.cpp. This is what I found:

json TimerData::createJSONArray(int s,json jsonObject, StepData& data)
{
double value = 0;
ctime_t ttotal = stepData[AdvancedTimer::IdStep()].ttotal;

// Level :
value = strToDouble(getVal(data.level), 4);
jsonObject["Level"] = value;…[Read more]

Hi!
Was just wondering if it would be better to open my previous post as a new topic. Would be great to get to understand the Advanced Timer more.

Best, Sarah

Hi!

While not directly related. I thought my question about the statistics retrieved from the Advanced timers may be useful here.

My questions concerns the interpretation of the data.
My question cencerns what the various data types represent? What does NUM entail? Is there any reason that the TOTAL of the TOTAL is a factor of 100 larger then…[Read more]

Hi Jerry,
It seems to me that you’re just using the export tab in SOFA. But using monitor you export files independent of the export tab in SOFA.
You can use montior as such and then you can choose if you want pos, vel, or force for specific vertices.
node.createObject('Monitor', name="filename", indices='@boxROI.indices', template="Vec3d",…[Read more]

Hi @Hugo,

I added a non-zero Rayleigh stiffness as else using the trapezoidal scheme my object completely lost its shape, it became unstable. Upon slight damping (as I set in the integration scheme it remained stable). I found this useful link, in particualr the second comment about the EulerImplicit (I’m still rather new to FEM) and it makes…[Read more]

Hi Jerry,

I had a similar issue using monitor but found that in using BoxROI as found in the documentation and then referring to those indices in the monitor '@boxROI.indices' (where ‘boxROI’ is the name of your object ‘BoxROI’) was an easy way for me to solve it. Hope that helps.

Kind regards,

Sarah

I’m not sure if I can answer all your questions, as I’m not a SOFA expert. But in my experience
1. I don’t think it is not necessary to use a .scn file.

2. I don’t know if you would need to set RequiredPlugin in a .scn file, but from the error message it seems as though you should. And similarly for .py file but than in python rootNode.createObje…[Read more]

Hi Hugo,

I thought I had responded earlier, but for some reason my posts weren’t coming through as they were being recognized as spam (but got that figured out now!).

To answer some of your questions, I was using UniformMass, but see the same behaviour although with a larger displacement for the DiagonalMass. I don’t have any plasticity set, am…[Read more]

Hi @Hugo,

I want to build a soft Robot that learns to walk with an optimization algorithm. Currently I’m just wanting to study force propagation in various meshes. So the FixedConstraint should be fine. Thanks! It makes sense and in my tests yield similar results! 🙂
Thanks!

Thank you Jean-Nicolas,
Also thank you for the addition you made to the scenegraph. Wasn’t getting them all to run in Sofa yet. But I’ll figure. I’m pretty sure it’s a mesh issue, as it seems to be more generic than just my cube. And using a simple flat mesh under gravity I found some similar issues. A sphere indeed may do well to, but would think…[Read more]

Hello again,
Found that this last problem with the rank deficiency was caused because I had also turned the subset of nodes into a Mechanical Object. Which is not necessary. Will run now that I removed that. But still shows rotation.. Am now trying option 3 in combination with 1 as lowering the posson ratio didn’t seem to reveal much change to the…[Read more]

Hi @jnbrunet,
Thank you for your suggestions!
Have been extracting the propper nodes in order to directly apply the surface pressure to the volume mesh. THis is a promising idea. However, I fell upon a different error… Mainly that SOFA says that [SparseLDLSolver] invalid linear system to solve. Please ensure there are enough constraints (not…[Read more]

I just tried the triangular squares and found the same behavior again..

Hi Hugo thanks for the update. It can be quite challenging to make hexahedron meshes in gmsh for more complex geometries (such as one with a cavity). Would MeshLab be a useful alternative as I don’t have CGAL plugin?

Are you saying I cannot use trianglar mesh in this simulation, because the tetras are angles out and thus generate a momentum……[Read more]

Hi!
I relooked at it, and am thinking it may indeed be an issue with the VTK, file.. Do you you have any recommendations for ensuring that one is right. As this changes the situation upon rotation whilst when rotating the stl of the cavity it behaves in the same way as before. I made it in gmsh are there specific things to watch out for besides…[Read more]

You’re right, I got it to work in the example. But haven’t invested a lot of time to further apply it to my simulation. Thanks

I found that the monitor is working rahter well now. It exports all the files in the bin and only takes the data points I’m concerned with. The VTKExportr is currently running but consistently exports at the beginning and not at the end even when setting exportAtEnd=”1″, which isn’t very helpful when wanting look at the animation. The gnuplots…[Read more]