internal force distribution rendering

[ZA123654]

Hi,
I am trying to read the internal force of a FE model and to build a visualization model like the following picture:

But I have no idea how to generate this kind of visualization model. Is there someone who can tell me how to adapt the scene to show this kind of model?

[ChangjingLiu]

Maybe this can help you!
https://github.com/sofa-framework/sofa/discussions/3673

[ZA123654]

Thanks, do you have any idea of how to implement it using Python?

[ChangjingLiu]

Here is a part of my code：

mechanicalmodel.addObject( 'TetrahedronFEMForceField', name="linearElasticBehavior", youngModulus=500, poissonRatio=0.4, method='polar', computeVonMisesStress='1', showVonMisesStressPerNode='true', listening='1', updateStiffness='true', )

[digitalhero1]

Hi, Changjing, I also work on a similar topic, and I am wondering if you tried to show the stress on the visual model, not only in the Forcefield model.

[hugtalbot]

I agree with @Changjing-Liu's and @digitalhero1's comments

[ZA123654]

We can only show it on the Forcefield model for now. It will be interesting to map it to the visual model. How to make the force field model transparent?

[ChangjingLiu]

Yeah, I'm also intetested in it.

[hugtalbot]

Transparency could be added but it requires a minor C++ change.
Here in the code of the TetrahedronFEMForceField, you see that the color related to the stress is computed using a color vector which 4th entry color[3] = 1.0f which means no transparency. The more this entry tends to 0 the more transparent it becomes.

Hope this helps