...
If you have loaded two or more particle sequences the RFRK is capable of calculating the amount of interaction between the different fluids. This is of particular interest with mixing fluids, because with the “Weights” channel you will be able to create blending colours when the fluids are mixing. Under → “How to... Use Weight Maps?” you will find a complete workflow description of how to achieve this effecteffect (Cinema 4D only by now).
Scale (C4D)
In order to visualize a channel's information two materials are required. The vertex map controls how they are blended, but in many cases the result is not satisfying. With “Scale” you have an effective method of controlling the vertex map's transparency. This means that you change the ratio of both materials.
...