# godrays **URL:** \ **Category:** Help Required\ **Created:** [November 12, 2016, 8:35pm UTC](https://forums.chaos.com/t/godrays/135246 "2016-11-12T20:35:50Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![maze\_sky](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@maze\_sky](https://forums.chaos.com/u/maze_sky)\ **Post date:** [November 12, 2016, 8:35pm UTC](https://forums.chaos.com/t/godrays/135246/1 "2016-11-12T20:35:50Z")
following this tutorial: [https://www.youtube.com/watch?v=QrGhnCEO5Wk&t=8s](https://www.youtube.com/watch?v=QrGhnCEO5Wk&t=8s) i can get a kind of undefined volume fog - but no godrays. Also the values for distance in the volumetric material I played with to get any kind of volume fog are completely differnt to the tutorial. I started to day with the 1.5.1 hotfix download a trial period. I will attach my scene and a reference render. Would be great if someone could point me to a solution. ![20161112_corona_volumefog_notreallyworking.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/b/5/b5a5fa187c8c50001997970e29066595d36747af.jpeg) [20161112\_\_corona\_godrays\_notreallyworking.max](https://forums.chaos.com/uploads/short-url/zr2ZlOI4uBnBQ8tgBWCfZMSslrc.max) (44 KB) ---
**Author:** ![maru](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/maru/32/15975_2.png) [@maru](https://forums.chaos.com/u/maru)\ **Post date:** [November 14, 2016, 2:42pm UTC](https://forums.chaos.com/t/godrays/135246/2 "2016-11-14T14:42:02Z")
Hi, sorry for the delay! I’ll take a look at your scene tomorrow and see if I am able to find out what is wrong. I hope it’s not too late… ---
**Author:** ![C00P3R](https://avatars.discourse-cdn.com/v4/letter/c/4bbf92/32.png) [@C00P3R](https://forums.chaos.com/u/C00P3R)\ **Post date:** [November 15, 2016, 3:00pm UTC](https://forums.chaos.com/t/godrays/135246/3 "2016-11-15T15:00:04Z")
Not a useful post but personally interested in learning more about this, I also had problems getting ‘god rays’ in my scenes. I found having the sun within shot makes a massive difference, not sure if that helps you at all! (Y) ---
**Author:** ![maru](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/maru/32/15975_2.png) [@maru](https://forums.chaos.com/u/maru)\ **Post date:** [November 16, 2016, 2:51pm UTC](https://forums.chaos.com/t/godrays/135246/4 "2016-11-16T14:51:09Z")
Sorry for the delay! Fixed. The problem was with: 1. Absorption distance - this can be sometimes confusing, so some experimenting was required 2. After lowering absorption distance the whole background became black - it was fixed by changing environment distance in Render Setup \> Performance \> Development/Experimental stuff. The godrays are not clearly visible in this scene, but they do appear if you move camera/sun. ![godrays1.jpg](https://europe1.discourse-cdn.com/chaosprd/original/4X/9/9/d/99d48d5039c1135ebe350104b0cd50b4ec1a1652.jpeg) [20161112\_\_corona\_godrays\_notreallyworking01.max](https://forums.chaos.com/uploads/short-url/4IWqWQOsHjIYGeMQ5PAvUgaFDk2.max) (716 KB) ---
**Author:** ![maze\_sky](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@maze\_sky](https://forums.chaos.com/u/maze_sky)\ **Post date:** [November 16, 2016, 8:24pm UTC](https://forums.chaos.com/t/godrays/135246/5 "2016-11-16T20:24:14Z")
Thank you a lot. Looks promising. Unfortunately I’m not using max 2017. Can you save the scene downwards compatible to max 2014? Or at least max 2016? Would be great. But you description should help me too. Cheers ---
**Author:** ![maze\_sky](https://avatars.discourse-cdn.com/v4/letter/m/e274bd/32.png) [@maze\_sky](https://forums.chaos.com/u/maze_sky)\ **Post date:** [November 16, 2016, 8:52pm UTC](https://forums.chaos.com/t/godrays/135246/6 "2016-11-16T20:52:57Z")
I tried to find the Performace → Development/Experimental stuff in Corona Render Setup Window… …but it’s not there. ---
**Author:** ![tom\_grimes](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/tom_grimes/32/52842_2.png) [@tom\_grimes](https://forums.chaos.com/u/tom_grimes)\ **Post date:** [November 16, 2016, 9:00pm UTC](https://forums.chaos.com/t/godrays/135246/7 "2016-11-16T21:00:26Z")
The devel/debug parameters are hidden by default - to expose them, go to System tab, click the System Settings button to open the dialog for system-wide settings (new in 1.5), and the checkbox for devel/debug is there. Check that, close the dialog, and head to the Performance tab and you will see those settings. ---
**Author:** ![maru](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/maru/32/15975_2.png) [@maru](https://forums.chaos.com/u/maru)\ **Post date:** [November 17, 2016, 12:13pm UTC](https://forums.chaos.com/t/godrays/135246/8 "2016-11-17T12:13:04Z")
Sorry, I sometimes forget to save to an older version just in case. Here is the updated file. [20161112\_\_corona\_godrays\_notreallyworking01-2014.max](https://forums.chaos.com/uploads/short-url/umTA5X8RdabmGN0O0gC3JoraJ7c.max) (708 KB)