How to get sun streaks /lens flare effect in compositor?

Question

I am making a space scene in blender

The sphere with that emission material is supposed to be the sun .I remember doing somthing with the Index OB pass so I have it enabled.I wan't to get sun streaks like this:

How do I get this effect using the compositor?

Answer 1

So I found a solution to this problem I could of course use the Flares Wizard addon as @Jonas said yet the question was how it can be done with the compositor. This is how it can be done:

1. Add in a sphere which should be the sun
2. Give it an emission material with a strength of 10
3. Navigate to the object properties panel and in the relations ->Change the pass index of the sphere to 1
4. Navigate to View layer properties and in the passes-> enable object index (IndexOB)
5. Hit Render
6. Open up the compositor and use the node setup as shown:

Then you will get this:

PS:If your sphere is too big you will need to tweak the node setup.Likewise adding in a blur node in between can smoothen out that sharp streaks... This is the rendered result:

If you want just sun glare you can you this node setup: (Add node near render layers node is not necessary)

Which will get you this effect :

When adding the sun beams node make sure to place the cross in the middle of the sun