I've been reading this paper for around 10 times to finally figure out the main process of sampling. I really wish the authors could explain more on the basic process instead of focusing on their contribution.
Solid particles are sampled only once at the beginning of the simulation. And later the solid particles would not move, or move only with the solid object. The paper mentioned there is a velocity for solid particle. That is its ghost velocity and would only be used in calculating the viscosity force for fluid particles that is near the solid surface. In integration, there is no real velocity for solid particles(as long as solid object does not move).
Because the relaxation process is really really slow for fluid volume samples, and based on the fact that all the fluid sample and solid sample has only to be done once during the simulation, I decided to write a file exporter/importer. I can run the simulator with a relatively higher relaxation iteration number and thus getting a better distribution of all the particles, and export particles to a certain file. This has to be done only once, and later when I will be testing other parts, I can just import initial state of particle from the generated file instead of sampling again.
Now the biggest problem to be is related to projection. In the sample process, a random sample is supposed to be projected to the surface which is described by a level set. Yet when I tried to use level set grid to do the projection work, I ended up with a crappy result. I think that is my fault in implementation. Hopefully I will fix that tomorrow, cause I don't want to use implicit surface only.
I'll post a picture of all kinds of particles when I fixed the existing problems.
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