2D

1

 

There are several different ways to accomplish this.
This information is available in this forum and in other areas of the web. Just have to look.

 

The problem is, with pixel data, you start out with black and you want to render colored objects, which normally would all be lit, but then you only want certain parts to be lit. So usually you have to draw the shadows.

But there are more advanced ways. E.g. with a render texture and separate camera, draw the `light` first, then feed that texture back into a shader used to draw the objects, and with the proper uv coords etc you can blend the two by multiplying their pixel values.

 

Idk if this will help but I found this asset a few days ago -
https://www.assetstore.unity3d.com/en/#!/content/24083

 

That asset seems to do the opposite, it shines shadows.

 

What I'd do is fake it by drawing the light rays in Inkscape, (I added a simple gradient so that it appears to fade out)

Sorta like this -


Import it into Unity as a Sprite,

And Set the Alpha to like 100.

The Results look similar to the images above (I put this scene together real quick to show what it would look like)

Of course if you put extra minutes of work in the drawing it would look much better, but this is just to show how easy it is to achieve the effect you want without any coding...

BTW could you pls tell me what games the last two images you attached came from?