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Export heightfield flow vector field

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How can export the flow of the water as a vector field after the erode node?

i would like to import my terrain to unity and have the resulting rivers from the erosion flow using a flowmap or a volume perhaps? is it possible?

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So i haven't found a way to export the process of hydro erosion as a vector field, so i took a step in another direction

Scattering a bunch of points on top of the final terrain and using a SOP solver to simulate waterflow downhill. I append a trail SOP right after and these lines can now be turned into a volume.

If anyone has a better idea please share.

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