Good afternoon, please advise. How do I achieve an effect like the one in the video? In the engine “Unreal Engine 4” . So that when it rains, and smoothly water droplets flow down from the surface. If there are any video tutorials or articles, I’d be happy to.
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You could try to do this via Simulation Stages, if you want it to be more advanced. This requires advanced Niagara knowledge though and there are next to no tutorials on it at the moment.
You can check out the content examples from epic for some insipiration & to get started with the Simulation Stages.
If your camera is fixed as shown in your clip (e…g. for a cinematic), you can also just sim this in Houdini and export it as VAT or alembic.
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Thank you so much for your help 
Thank you so much for your help 
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