How to achieve bloom effect for a emission material in cycles . I want to do it without compositing 
As shown in the picture there is an emission material (blue in color) Is there any way to achieve this without compositing?
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3$\begingroup$ Hello :). Bloom (in Eevee) is a faked light diffusion. To get the same effect in Cycles you'd need to add some volumetric fog. $\endgroup$– jachym michalCommented Jul 12, 2020 at 8:59
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$\begingroup$ Thank a lot but I can't use it in this since i have a 8k HDRi and it is impossible for my potato PC to handle. Not that I even knew about it to get something like this. $\endgroup$– NxdhinCommented Jul 12, 2020 at 9:39
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1$\begingroup$ yes Volume Scatter or Principled Volume are a bit heavy, faking it with Layer Weight is the solution for potato computers ;) $\endgroup$– moonbootsCommented Jul 12, 2020 at 9:48
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1 Answer
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As Jachym Michal says you can create a box with volumetric. A lighter solution is to fake the glowing with a Layer Weight/Facing node:
- Create your object.
- Create a sphere that contains your object (here displayed as wireframe) and give it a Subdivision Surface modifier to make it smooth.
- Give it the following material, which is a mix between Emission (with the color of your cube) and Transparent, with the Layer Weight as Factor in the Mix Shader.
- Of course you can increase the Emission' Strength. Also the node organization can be improved with a second Mix Shader to add more transparency, or you can control the Layer Weight with a ColorRamp, or add noise, etc... And you can scale the sphere on whatever axis you want if the object is a long one.
answered Jul 12, 2020 at 9:13
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$\begingroup$ Thank a lot but can you explain why there is an empty and how to use it and to increase the intensity of the effect what should i do? It works for me perfectly. $\endgroup$– NxdhinCommented Jul 12, 2020 at 9:49
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$\begingroup$ there is no empty, it's a sphere that I've created that contains the cube, I've disaplayed the sphere as wireframe to make it clear, the material belongs to this sphere, the cube material is just made of an Emission node. $\endgroup$ Commented Jul 12, 2020 at 9:51
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$\begingroup$ What do you mean by "increase the intensity"? You can increase the Emission Strength if necessary, or give more transparency with another Mix Shader, etc... $\endgroup$ Commented Jul 12, 2020 at 9:55
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$\begingroup$ I got a ball of light when I did what you said $\endgroup$– NxdhinCommented Jul 12, 2020 at 10:19
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$\begingroup$ it's a fake scattering so you can play with all the factors of your nodes like Emission strength, transparency, sphere size, etc... does it achieve what you're looking for? $\endgroup$ Commented Jul 12, 2020 at 10:20