With the “Hybrido Mesh” engine it is possible to “bake” the core fluid's displacement to the final mesh and there are several parameters to control the final look. With these settings you separate the displacement from the splashes. A Hybrido fluid's displacement can be seen as an additional layer on top of the main body of water. This layer adds small waves and ripples to the surface and provides extra realism. In order to use this feature with a simulation, it has to be activated manually under the Hybrido domain's “Ocean Statistical Spectrum” panel. The surface structure is exported as a sequence of TIFF images. When loaded to the “RealFlow Hybrido Mesh” plugin the height information is used to displace the mesh's vertices. The bitmaps can be processed with the → “RealFlow RenderKit Cloud” tool as well, and mapped to any other geometry.
If your core fluid simulation has been simulated without displacement, this parameter set can be ignored. Please bear in mind that this option is very RAM-intensive and creates very large meshes – several million polygons per frames are absolutely normal. The parameters of the "Displacement" panel support the "Interactive Meshing" feature.
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This parameter is only accessible when “Auto edge length” is disabled (“No”). The value given here will be used by the HyMesh engine to define the length of the mesh's border triangles. The final number of edge triangles, on the other hand, is then calculated from this length. The value is measured in metres [m]
Use displacement
Here If you can decide whether you want to add bake the displacement information to the mesh or not. “Yes” unlocks the associated parameters.enable this option.
Height attenuation
When this option is enabled the height of the mesh's vertices will be taken into account: all vertices with a height value greater than “@ height attenuation factor” will not be displacedIf you want to consider the vertices' heights to fade the displacement please activate this option.
@ height normalization factor
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@ height min/@ height max
The fluid's height is evaluated at each vertex of the mesh and, of course, this process returns a very broad range of values. These ranges are difficult to handle, because you have to know the exact minimum and maximum values. Therefore they are normalized, and after this process, all values will range between 0 and 1.
With “@ height min” and “@ height max” it is possible to attenuate (attenuation can be seen as a damping effect) the waves' height for each vertex in the given range. If you use a value of 0.2 for “@ height min” and 0.7 for “@ height max”, for example, only vertices within this range will be affected. This way it is possible to fine-tune the height of the displacement waves exactly to your needs.
Speed attenuation
The Hybrido fluid particles' speed is an important property and perfectly suited to the creation of attenuation (= thinning) effects: the faster the particle, the stronger the thinning effectWith these parameters it is possible to define a range: vertices, with height values smaller than “@ height min” will not be affected. If a vertex' height value is greater than “@ height max” then it receives full attenuation. Between these extremes, attenuation is applied gradually
Speed attenuation
If you want to consider the vertices' speed to fade the displacement please activate this option.
@ speed normalization factor
In most simulations, velocity values cover a very broad range of values, e.g. from 0 m/s to 23.7 m/s. These ranges are difficult to handle and therefore they are normalized. After this process, all velocities will be between 0 and 1. With this factor you can “amplify” the normalized values, because they will be multiplied with the given "@ speed min/max" values.
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@speed min/@ speed max
The fluid's speed is evaluated at each vertex of the mesh and, of course, this process returns a very broad range of values. These ranges are difficult to handle, because you have to know the exact minimum and maximum values. Therefore they are normalized, and after this process, all values will range between 0 and 1.
With “@ speed min” and “@ speed max” it is possible to attenuate (attenuation can be seen as a damping effect) the waves' speed for each vertex in the given range. If you use a value of 0.2 for “@ speed min” and 0.7 for “@ speed max”, for example, only vertices within this range will be affected. This way it is possible to fine-tune the displacement waves exactly to your needs.
Splash attenuation
“Attenuation” can also be explained as damping – or better – thinning. “Splash attenuation” means that With these parameters it is possible to define a range: vertices, with speed magnitudes smaller than “@ speed min” will not be affected. If the speed magnitude is greater than “@ speed max” then it receives full attenuation. Between these extremes, attenuation is applied gradually.
Splash attenuation
“Splash attenuation” means that in those areas of the core fluid that behave more like splashes become thinner in the mesh. These the displacement fades, and finally vanishes. These areas normally do not need any displacement at all.
@ splash attenuation factor
With this parameter you can control the amount of “thinning”. 0.0 does not create any attenuation at all, while 1.0 represents the highest valueit is possible to make the displacement patterns vanish faster (> 1) or slower (< 1).
Vorticity attenuation
The mode of operation is very similar to “Splash attenuation”, but here areas with vorticity are affected. Here, vorticity can be used to fade, and finally remove the displacement. Please bear in mind that the grid domain's “Vorticity” channel has to be activated before the simulation starts, because otherwise this option does not have any effect at all. By default, the “Vorticity” channel is disabled:
HY_Domain node > Node Params > Particle Channels > Vorticity
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@ vorticity attenuation factor
To enhance or weaken the vorticity attenuation effect, this parameter can be used and works as a multiplier:
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With this parameter it is possible to make the displacement patterns vanish faster (> 1) or slower (< 1).