The Erosion attributes can be found in the bifrostLiquidProperties attributes. They control how closely the fluid boundary gets shrinkwrapped back to the particle positions. You may need to adjust these settings to avoid problems in various situations, such as still water versus thin flows or energetic splashing. Values lower than 0.0 or greater than 1.0 have no further effect.
- Factor
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Controls the amount of erosion of the fluid surface. A value of 0.0 results in no erosion, while 1.0 erodes by the full particle radius.
Use low values (0.0—0.2) to help achieve equilibrium in still-water situations. Use high values (0.7—0.9) in more energetic situations, for example, to achieve nicer-looking bow waves and boat wakes, or to avoid fast particles "surfing" across the fluid surface.
- Factor Near Solids
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Determines whether the fluid surface is eroded in regions that are close to collider objects, based on the normal of the collider surface. Note that wherever the surface is eroded, it is always eroded by the full Factor amount.
- At 0.0, no erosion occurs near colliders.
- At 0.5, the fluid surface is eroded near colliders only where the collider's surface normal is angled downwards. This can help to alleviate problems with liquid sticking to the underside of colliders, while still allowing for thin flows on top of colliders where the normal is angled upwards.
- At 1.0, the fluid surface is eroded everywhere.
You can vary this value anywhere between 0.0 and 1.0 to adjust the behavior. In general, use low values for thin flows on top of colliders, or if you experience problems such as repulsion, clumping, or climbing near the walls of colliders. Otherwise, use higher values so that splashes do not get damped.