Some FLIP questions

[catchyid]

Hi,

I have some FLIP questions, any help is appreciated

1- In particles reseeding, how is "Particle reseeding -> Particles per Voxel“ useful? meaning, what difference does it make to set it to 4,8 or 16?

2- ”FLIP Object->Grid Scale“ and ”Particle reseeding->Particles Per Voxel" seem to define the same thing? i.e a bigger grid will have more particles per voxel, so why redefine the number of particles per voxel again?

3- What does mean that particles are “unresolved” ?

4- I understand that the “pressure projection” solve is the process that changes particles velocities to compensate for pressure differences (i.e. move particles from high to low pressure). My question: if the number of particles per voxel can change freely (i.e. particles reseeding, voxel size, …) what really defines pressure? i.e. what makes some areas of fluid have more pressure than others?

5- According to docs, Particles reseeding will increase spawn particles if they are below a certain count per voxel and vise versa. My question: what makes particles diseapear in the first place? I understand they are moving, but so what? If they leave a voxel then the voxel becomes empty and it's even “wrong” to create particles just to meet the minimum particles count per voxel? The same question applies on having “too” many particles per voxel, what this happens in the first place and what does it mean?

 

Thanks...

[KarlRichter]

Rather than directly answering your questions, I would suggest pursuing a deeper understanding of FLIP fluids. I highly recommend this masterclass, it really opened my eyes: 

 

 

[catchyid]

Thanks, Ikon also hinted me to this video! Thanks guys, I will watch it, hopefully it will answer my questions