How to create a glowing corona/halo around a sun and make it emit light

Question

I am trying to understand material and shaders in Unity. make my object glow like a sun. For the moment I do not care if it's not looking like a star, but I would like that it at least emit light.

How do I make something that look like a star, and emit light? Like this:
(And if possible, be able to change the light color)

I tried to play with the Standard shader, and add some emission like this :

I tried legacy self illuminated, but they look like 2d, and have no depth

Answer 1

In order for that shiny halo to appear around HDR-colored materials, you need to add a Bloom post-processing effect to your scene.

How to do that and what settings that filter has available differs a bit depending on whether you use the Universal Render Pipeline, the High-Definition Render Pipeline or the build-in render pipeline.

For HDRP and URP:

1. Create a global post-processing volume in your scene with Volume -> Global Volume.
2. Add a new Profile to that volume.
3. Click on "Add Override..." and add the "Bloom" effect to that profile. Enable the "Intensity" property and set it to 1.0 for now. You can tweak it later.
4. Select your camera and enable the "Post Processing" checkbox.
5. Give your sun's material an HDR color for its emission property in the desired color, and crank up its intensity
6. You can tweak the emission color of your material and the bloom effect on your post-processing volume by configuring it according to the documentation for URP Bloom or HDRP Bloom

For the Build-in Render Pipeline:

1. Install the post-processing package via the package manager.
2. Create an empty gameObject (your post-processing volume)
3. Set the Layer of that game object to a new layer "Post Processing"
4. Add the Post-Processing Volume Component to the game object (Rendering -> Post-process Volume)
5. Check "Is Global" on the volume
6. Add a new Profile to that volume.
7. Click on "Add Effect..." and add the "Bloom" effect to that profile. Enable the "Intensity" property and set it to 1.0 for now. You can tweak it later.
8. Select the game object with your camera and add the Post-Processing Layer Component to it Rendering -> Post-process Layer.
9. On that post-processing layer, set the setting "volume layer" to your new layer "Post Processing"
10. Give your sun's material an HDR color for its emission property in the desired color, and crank up its intensity
11. You can tweak the emission color of your material and the bloom effect on your post-processing volume by configuring it according to the documentation for Build-in RP Bloom

From now on, remember to wear sunscreen while working on this scene :)