working with odd shape rooms

Greetings. I am a roll20 newby who is looking to run a pathfinder campaign based on the new worldwound adventure path. My question (the first of many i am sure) is how do you work with caves and caverns as far as fog of war goes? I copied the pdf into photo shop, scaled it until each grid square was 70x70 (jpeg) and then drug it into my roll20 campaign and then it is my understanding that now i set up fog of war and make the rooms so that as the characters move around, pillars and boulders and such block light/vision as well as walls. but the vtt seems to be set up for standard geomorphic shapes like squares and rectangles. Is this a limitation or have I just not found the tool that will allow me to block out those areas for a better gaming experience? Sorry I am so long winded but just wondering if this topic has been covered before or not. could not find it in the forum search. Thanks in advance for any help/advice.

Use the polygon reveal tool to create unusual shapes while revealing the Fog of War. If you need any help setting up or learning Roll20 let me know. :) - Gauss

that is a great start.. thanks. i'll play around with it some more.

An interesting workaround I found was to put some tokens on top of the token layer that are the correct shape. Then just move them to the GM layer at reveal time. It's quicker at game time, but more fiddly at setup time.

Another way (since you're a mentor) is to learn the Dynamic Lighting feature. You draw the lines of the cave well before the game starts and then when the players move through, it lights up their field of view for them.