How can I make a luminescent gas cloud, similar to the one shown in the picture below (labeled "Trapped Atoms")? Thank you.
Simple Sphere with Emission as a Volume would be sufficient. We will use for both methods mostly the same setup. Gradient Texture > Color Ramp > Emission shader.
Color Ramp will control color and smoothness. Emission > Strength... Strength.
Without Emission.
They will look like gas spheres and emission will not affect other meshes.
With Emission.
This ones will affect meshes with light.
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$\begingroup$ Aw, beat me to it! Great answer, have an upvote. (: $\endgroup$ – SilverWolf Oct 15 '18 at 22:51
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$\begingroup$ Hi cgslav, I have tried using your method. However, when I increase the emission strength, the cloud goes back to being a solid sphere again. Do you know a method that works at all emission strength? Thank you. $\endgroup$ – user3886914 Oct 16 '18 at 23:15
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$\begingroup$ @user3886914 than you will need to tweak color ramp to make it soft again. $\endgroup$ – cgslav Oct 17 '18 at 1:27