Add Edge Fusion to your scene in 2 simple steps:
1 – Go to Game Object – Volume – Custom Pass
2 – Add a new custom pass pressing de “+” Button and select Edge Fusion.

3 – Set the Custom Pass to Global and Injection Point to “After Opaque and Sky” or “Before Transparent”.
4 – Set Intensity to 1 to enable the effect. That’s it, now you can start playing with Edge Fusion parameters and smoothen & blend all the meshes and edges in your scene.
That’s it, now you can start playing with Edge Fusion parameters and smoothen & blend all the meshes and edges in your scene.