How to remove the brown spot under my object?

Questions & Answers
1

I have a transparent circle cut around my object, when I run instead of seeing green ground I see brown. How do I make it so that the area around my tank can show what is around it? (Im making a FOW)

2

hi;
fow can not be created this way ;
u need to use shaders for it;
i suggest u to read this article :

fow