Simulating sun rays thru window

[hoseinasadi]

i used a vray sun and added vray fog environment, in picture below, before/after the using the fog effect. question is, how do i keep the room lighting like in the 1st picture "bright day light " and also have the fog effect like the 2nd picture. cause right now i get the fog effect which is good , but the room is too dark, which is not good. also how do i take control of the fog direction, say i want the fog effect on the right corner of the room.

Edited January 22, 2014 by hoseinasadi

[Chris MacDonald]

Render the beauty pass without fog, then using the material override render the scene with a black material on everything, with the fog turned on. Layer the two passes together in photoshop with the fog layer set to screen blending mode. Use curves to control fog falloff etc.

[j_forrester]

Do as Chris said above.

 

The main reason for keeping effects like this seperate in Photoshop is if the client says can we knock back the "fog effect" you can simply dial down the opacity or get rid of it completely. If it is "rendered in" as a flatten layer you would have to re-render the whole scene again each time. This is also the principle for all render elements, allowing you to tweak them as and when desired.

[hoseinasadi]

Render the beauty pass without fog, then using the material override render the scene with a black material on everything, with the fog turned on. Layer the two passes together in photoshop with the fog layer set to screen blending mode. Use curves to control fog falloff etc.

 

how do i render a beauty pass ?

[j_forrester]

Correct me if i'm wrong, but "Beauty Pass" is simply a term of the final rendered out image that you see in the rendered frame. This is the render you get "out the box" with no post-production carried out.

 

What Chris is basically saying is render out your image with the lighting, textures etc as you want i.e your "beauty pass" and then do a seperate render for the fog pass using an override material and comp this together in Photoshop setting the fog pass to a screen blending mode (with this blending mode anything black will be hidden and anything white will stay visible).

[hoseinasadi]

thanks alot guyz will post results soon.