Looking nice, great first scene!
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You can increase the reflection quality using this command “r.ssr.quality 4”- and in the .ini config files you can even change the values of this to be higher if you need even more clarity- this comes with a big performance cost, but if you are running on a good rig and are only aiming for 30fps you will be fine.
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Have a look at the new “two sided foliage” shading model, I find it works great for plants and foliage with some tweaks!
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Do you have the AA method to be temporal right now? I find it rare that such obvious aliasing occurs, unless you are running at 1080p. Moving up to 1440p or higher makes a big difference in clarity and reduces a lot of artefacts.
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Depth of field is just a matter of tweaking in the post process settings, you have to find the values that match your scene. Try both the Gaussian and CircleDOF methods, and see which you prefer!