How to maintain GI when rendering objects/shadows onto hidden surfaces

Hey to all!.. Ok I have my tropical island scene that was created with 3dsMax/ForestPack/PhoenixFD & Vray 3.6 … I’m rendering out individual elements within the Max scene to composite into After Effects…
Attempting a crash course for rendering shadows onto hidden surfaces using Vray, the settings within the screenshot below is what I changed in order to achieve the effect..

however the GI lighting renders out differently (primarily the palm trees, grass & rocks), when I use this approach as opposed to rendering all elements in one shot!?.. I understand the palm trees leaves alpha is affected due to low resolution (480x270) which I’m not concerned about, though I do want to retain the juicy vibrant colour from render 1. …


Any suggestions on how to fix this?.. much appreciated.. thanks in advance!!! :smile:



Anyone anyone??.. surely someone has an idea??