How To Create Volumetric Lighting Through Window???

Chef_0f_J0EY_SH3rWay

I would like to archive foggy/moody/volumetric lights that shine through windows like in this picture above.
I have seen a lot of artwork with this type of light and I simply do not know how to set it up in my scene.

The picture below is my scene

I am trying to make the light very bright and foggy when they shine through the window but I don't know how and where to begin. 

Here is what I really want to achieve
 

Thank you for your time. Any suggestions would be very appreciated!

Obscura

Separate the grid material from the glass material. Make it a mesh basically. And then disable shadow casting on the glass. You will also need to enable "cast volumetric shadows" on the light source.

Chef_0f_J0EY_SH3rWay

Obscura said:

Separate the grid material from the glass material. Make it a mesh basically. And then disable shadow casting on the glass. You will also need to enable "cast volumetric shadows" on the light source.

what glass material? I do have Cast volumetric shadow to On

Obscura

Volumetric stuff does not handle opacity. So if you want the light to shine through the window, make the grid to be a mesh. And make the invisible parts NOT casting shadow so it will shine in and the bars will cast some volumetric shadows.