I tried increasing the emission strength to 10, but it make the whole scene bright like this, so if I compare the result of this and Eevee’s, Eevee’s has high contrast. Is it possible to get the same effect as Eevee’s bloom without atrocious amount of efforts? (If it requires atrocious amount of efforts, I will give up.)
The Glare node and Bloom work differently so you may need to add some more nodes to get the same bloomy result.
First of all, turn up your threshold value to something above 0.0. the threshold must be lower than the intensity of your emitter, but it doesn’t need to be 0.0, or this will make everything glow.
Secondly, try turning up the mix value to 1.0, so the node gives you only the glowy stuff. Then you can manipulate this pass by itself before adding back onto the original image. Try blurring it more with a blur node, then adding it to the original image with a MixRGB node. You can type in a mix factor greater than 1 to really make it glow.
you can duplicate the scene, render 2 versions with different render engine and then in compositing you can add bloom pass from eevee on the top of cycles image.
Note that Eevee passes are available only in 2.82 or 2.83 alpha (can’t remember which one)
It works if you feed the glare node only the parts that are suppose to glow. In other words you need an alpha from the object or render an emission pass and use it. Cryptomatte would also work to isolate the object.
