How can I use render element in Vray for post production in Photoshop?

Now, Im using Vray 3.4.
As I study by myself from youtube,
most of them use Mat ID, lighting, reflect , then blending in PS by screen, overlay or multiply.
Some of them use GI, raw light ,Raw reflaction , Raw reflection and so on…

I know that Mat ID can help us when we want to select something easier.
Light or reflect can make that image more brighter and more reflective, but what it’s different and how can I use it between

Reflect and Raw Reflect
Reflact and Raw reflaction
Light and and Raw light

I checked from CHAOS, there are a lot of render elements
but I dont know how to apply it when I use photoshop, of course I can find many clips that teach about render element,

but I cant not find criteria to use it.

sorry for my poor English

Thank you

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What are you trying to achieve?

You want all these elements in different layers?

Sorry, I mean because some tutors use only reflection and lighting,

but some tutors use more than 2-3 render elements, such as GI, Raw Reflection, Reflaction etc.

In this case, he use

  • raw reflection ,
  • raw reflaction ,
  • raw gi,
  • raw light ,
  • raw total light ,
  • refraction.
  • reflection …
    and he use different blending for each layer, some layer is screen , some layer is overlay .

So, I would to know , is it have any conclusion if I want this material more dark, what render element I should use? , If I want this metal more bright, this finishing more glossy , what render element I should use?

Sorry again for poor English

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