I store path as Points list, and set them into a texture, I sampler those points with bezier, calculate vertex with them, and then make sure line face always direct to screen.
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There are same time from one point to next point( points average ), it looks sometime wrong when points are not averaged distributed in target curve (Time → process (0~1, points average ) → sampler position). Is it better to create another texture?(Time → process (0~1, points average ) → process2 (0~1, length average ) → sampler position)
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This is really coool, can t wait to access it live 
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