Every surface and polygon object can be equipped with a "RFVolume" world space to modifier to refine the collision geometry and control how the particle particles "see" the object.
Collision Geometry Detail
Here you find five levels of quality. The higher the level, the longer the simulation will take, but the fluid-object collision will also be more accurate. Changing the level influences and updates the "Cell Size" value found in the "Volume" section. In most cases, the calculated value provides the best balance between simulation speed and accuracy. If you want to control "Cell Size" manually deactivate the associated "Auto Cell Size" checkbox.
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