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Grouping points bases on velocity, but ignores velocity change


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hi everyone, i have a destruction cache from maya, i use trail to compute velocity and transfer to speed; i group some points base on speed (e.g speed >= 8), and scatter to generate smoke; but speed keep changing, if the point speed less than 8, i will lost it and result in my smoke trail is broken... so how can i constantly keep these points if their speed is greater than 8 once?


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