Here are the pair of interesting modes. I have rendered VrayMtlId which helped me to cut out objects easily in Photoshop by magic wand tool. Here it is:
And again with help of VrayMtlId I got next picture
I created simply two materials and mixed them by BlendMtl, laying on a channel mask texture with waves and fishes.
The last picture was needed for creation of small luminescence round a gold picture on a wall.
During post-processing I added different details, and also did color correction a little. You can see the result of post-processing on this picture.
Well that is all. You may ask if there will be some questions, I will answer with gladness. And I hope you have found anything useful to your own. I wish creative success to you! Nikita's Portfolio - veprikov.deviantart.com