how to understand m_V

[zhang-qiang-github]

Please have a look at the following code:

https://github.com/erizmr/taichi_sph/blob/2e8780f6d7a43fe2e38f9a62d2b24e614e3dfa20/particle_system.py#L21

How to understand m_V? Is it the mass of particle?

But, the mass should be density * v = density * (pi * (radius**2)).

Any suggestion is appreciated~~~

[zhang-qiang-github]

self.particle_diameter ** self.dim treat the particle as a cube.