I have an object which represents an atom. I want to show a spherical gradient where the cloud is intense in the centre. It fades away to the edge.
I tried emission but not getting the desired output.
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Instead of Emmision use Volume Absorption node.
In some cases it's quite efficient to fake it by simple circle object with Spherical Gradient texture assigned to alpha. Circle orientation Tracked to Camera, so moving object is always facing to camera that make in illusion of 3d object.
(In case you don't care about shadows.)