Help How to stack different colors but keep their volumes

[josemendez]

Thanks for your reply. The Q1 is mostly solved. But the Q2 still exists. I upload a pic that shows the interface between the two fluids. There is a serious graininess at the interface.

This is a particle-based simulator, and at the interface between two fluids the particle-based structure will be apparent. The only way to reduce this is using higher fluid resolutions (not recommended, very taxing on performance), or using a custom fluid renderer that performs more aggressive smoothing at fluid interfaces.