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Please take a look at the image below. It shows the traditional, completely grid-based approach we had in RealFlow 2012. The view represents a 2D view of a domain with an interacting object. As you can see, there are gaps. These gaps occur, because the object is rasterised as well and it is not possible to fill cells only by half or one third. The size of the cells also control the distance between the object's surface and the fluid's surface. If the interacting object is positioned incorrectly you will observe a rather large gap:
RealFlow 2013 2014 uses a completely different approach. There, the outlines of an object are represented as a distance field. The quality, or better resolution, of this field depends on the number of grid cells you have determined for the object in its “Cell size” parameter. As illustrated below, the domain's particles follow this distance field and create a rounded surface matching the object's shape:
This means that Hybrido 2 works with two different cell sizes: one for the domain and another for the object. It is important to know that the domain's “Cell size” is the higher-ranking parameter. So, even if you use very small “Cell size” values for the object, you will not achieve any improvements with regards accuracy, because the solver cannot “see” these small cells. Values of 0.1 (object) and 0.2 (domain), for example, do not have any influence and you only waste memory. The result in terms of fluid-object interaction remains the same:
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