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I am working on a project that uses Vector attributes on a plane to set the velocity attribute of a series of particles. How this is set up now the particles start on a primitave that has an initial vector on it, so they start moving. They travel over a region of primatives with no vector set, which I have the system ignore. Eventually they cross another prim with the vector set and they take the new vector immediately. What I am looking for is a way to detect when they cross over this region and instead of immediately taking the vector, I want to have the change be more gradual over time. Is there any way to do this? I know how to do it for an entire span, but only for specific frames. How do i make it only happen when it detects a change in the velocity vectors.
