Rendering portal like in Portal 2

I have read many articles and questions on forums about making Portal System in Unity. But, I know how to do it, and my question is not about that.

I want to make portals' particles and effects сompletely identical from the game. Like here:

I don't really know much about materials and shaders, but I have found some textures from the original game. I have been searching for something in game data for a long time. I have found portal gun with their animations, sounds, map textures with height maps and normals, but I don't really understand how the game renders portals (effects and particles, not watching through portals). What I have found about that:

(.vtf files: textures, images, sprites; .vmt: material description)

noise-blur-256x256.vtf

It was declared in one of .vmt (materials in source engine) files.

I am thinking that it can be used for the closed portal (when only one portal enabled), like here:

portal-blue-color-dx8.vtf

Very interesting texture, 'cause it has hidden colors under alpha. How it looks without alpha:

And with alpha:

What I understand, that the game renders portal based on hidden colors under alpha and displays not transparent pixels (border of the circle). But, where did it find particles, I don't understand.

Beam edges (in materials/particles):

beam_portaledge_01.png

beam_portaledge_01b.png

beam_portaledge_02.png

beam_portaledge_04.png (it is really not transparent)

Also, I found the particle, but I don't think that I need it.

energyball.png

It was declared in portal_projectile.pcf, but I think that it isn't what i'm searching for.

So, do you have some ideas how I can mix all this textures and take something like this in result? I have no ideas.

I don't want to make some smoke, glow and other effects (not now). Just rendering this pretty portal effect like in Portal 2.