Render multiple objects of the scene in png for final render customization

Hey there,

I want to render an interior scene whereas I want to customize Sofa, Rug, Wall, Floor, Sidetable from Corona renderer.

  1. I separate renders of each of those objects using ShadowCatcher material and in the end merging those all outputs in one.
  2. If any objects changes, I just have to replace one object with it’s own shadow.

Problem:

  • While I was rendering using ShadowCatcher material, I got some unnecessary shadows of other objects even if I hide it or exclude it from camera. Unfortunately, it still shows the unnecessary shadows of other parts.

  • When I decrease the amount of shadow in the material it still shows me the same problem.
    I am getting other GI bouncing on shadowcatcher material.

Vray Render: I tried doing with Vray render engine, and I got perfect output as necessary shadows. I want to execute this project in corona.

I have attached renders for reference of current output in corona along with settings.

Please help me with this issue.