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Make dust with " Point Cloud " .

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How to find an attribute by ID with Point Cloud ? .
My director Give me an idea to do dust (I'm a trainee). The Idea is to scatter point on the geometry , then use point Cloud In Vex to check the points neighbors. When the neighbors change , It mean that the piece break so you can create an attribute at this moment and reduce It over time to zero. Use this attribute in volume rasterize to emit you density. 
So , that's the idea . But i no have idea how can i do that  . 
Please help me if you can . 
Thank you .

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