How to generate textured mesh videos?

[hbell99]

Hi, I reproduced the code and found that only videos of predicted particles are saved.
I wonder how to generate the textured mesh videos given the predicted particles?

[PingchuanMa]

This is a good question. MPM is a semi-particle-based method and thus there is not an underlying mesh. There are a few ways to simulate the effect though:

1. Reconstruct the mesh and advect the mesh with the particles.
2. A hacky but easy way is to simply add the original vertices in the msh into the particle set of MPM. The textured mesh will be automatically advect along with the particles.

In NCLaw paper, we used 2.

[ReFantasy]

We have a small confusion, we noticed that the volume of each particle is obtained by dividing the mesh volume by the number of particles. One issue is that volume sampling is not uniform, is this approach just an approximation?

[qlin72]

Is there any specific code to generate the textured videos? Just confused because not able to find method 2. in the code.

[PingchuanMa]

We have a small confusion, we noticed that the volume of each particle is obtained by dividing the mesh volume by the number of particles. One issue is that volume sampling is not uniform, is this approach just an approximation?

It is an approximation. A more accurate way is to spatially hash the particles and use lumped mass matrix, but I don't think they will differ a lot since the volume sampling is also optimized for homogeneity.

[PingchuanMa]

Is there any specific code to generate the textured videos? Just confused because not able to find method 2. in the code.

The code for method 2 is not included in this code base since it deviates from the main purpose and is not nicely organized given my current bandwidth. Some utilities are left there like the particle sorting based on blobs and the method 2 should be fairly easy to build upon ;)