# Underwater Pool Light **URL:** \ **Category:** Help Required\ **Created:** [January 20, 2017, 3:59pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909 "2017-01-20T15:59:16Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Markus\_Thaler](https://avatars.discourse-cdn.com/v4/letter/m/9fc29f/32.png) [@Markus\_Thaler](https://forums.chaos.com/u/Markus_Thaler)\ **Post date:** [January 20, 2017, 3:59pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/1 "2017-01-20T15:59:16Z")
Hi, how can I add some lights under the water in a pool? I made a water material with Reflaction, Refraction and Causics, bur when I add a Corona light (tried also with IES) under the water, nothing happens. It seems that the light has no effect. ---
**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:** [January 20, 2017, 4:11pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/2 "2017-01-20T16:11:48Z")
Light (yes, that’s one light) inside a box with refractive material, with caustics enabled. Seems to work fine. Can you post your results? How is your water material made? ![water1.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/5/e/5e6f468f16f89937899f97693ce11effe42436ef.jpeg) ---
**Author:** ![Markus\_Thaler](https://avatars.discourse-cdn.com/v4/letter/m/9fc29f/32.png) [@Markus\_Thaler](https://forums.chaos.com/u/Markus_Thaler)\ **Post date:** [January 20, 2017, 4:25pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/3 "2017-01-20T16:25:50Z")
Here’s a picture. The light under the water looks strange not like in reality like picture 2… ![pool.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/b/1/b1c88691ba23227dd9a95ea0dcaae61d1a06b159.jpeg) ![0001_Pool-mit-blauer-Beleuchtung-bei-Nacht-im-Garten.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/5/b/5beaae0de91c79deabed66d287157f527d97bc69.jpeg) ---
**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:** [January 20, 2017, 4:52pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/4 "2017-01-20T16:52:08Z")
In that reference photo the light is probably scattered inside tiny bubbles. You would either need to model them using particles, or enable volumetric scattering for your water material. ---
**Author:** ![romullus](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/romullus/32/271095_2.png) [@romullus](https://forums.chaos.com/u/romullus)\ **Post date:** [January 20, 2017, 6:04pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/5 "2017-01-20T18:04:47Z")
> [@Markus\_Thaler](#): > > Here’s a picture. The light under the water looks strange not like in reality like picture 2… It looks like your reference photo was taken with long exposure. Most likely it would look quite differently if taken with short exposure. ---
**Author:** ![sylphx](https://avatars.discourse-cdn.com/v4/letter/s/91b2a8/32.png) [@sylphx](https://forums.chaos.com/u/sylphx)\ **Post date:** [January 21, 2017, 12:24am UTC](https://forums.chaos.com/t/underwater-pool-light/135909/6 "2017-01-21T00:24:22Z")
Here’s what I came up with through quick test. Used two materials and objects. 1. plane w/ water material for the surface- reflection- (1,1.48,1) -refraction (1,1.33,1) - absorption 35m (blue color, 5, 50, 120), ripple bump map just under of the water surface plane 2. box w/ corona volumetric material - blue absorption and scattering (5, 50, 120) absorb distance, 10m, scattering, 0.5, Emission Distance 8.5m color (50,200, 225) ![testpool.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/6/2/62b1ef690e3c77a2ed17481cbf7f917a97c840cc.jpeg) ---
**Author:** ![SuperJet](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@SuperJet](https://forums.chaos.com/u/SuperJet)\ **Post date:** [January 22, 2017, 1:01am UTC](https://forums.chaos.com/t/underwater-pool-light/135909/7 "2017-01-22T01:01:05Z")
So, 2 mats for this ? (prol better than photo) ---
**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:** [January 23, 2017, 12:29pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/8 "2017-01-23T12:29:37Z")
> [@mferster](#): > > Here’s what I came up with through quick test. Used two materials and objects. > > 1. plane w/ water material for the surface- reflection- (1,1.48,1) -refraction (1,1.33,1) - absorption 35m (blue color, 5, 50, 120), ripple bump map > > just under of the water surface plane > 2. box w/ corona volumetric material - blue absorption and scattering (5, 50, 120) absorb distance, 10m, scattering, 0.5, Emission Distance 8.5m color (50,200, 225) I am pretty sure this could be easily merged into a single material for an easier setup and better performance. ---
**Author:** ![sprayer\_1](https://avatars.discourse-cdn.com/v4/letter/s/5fc32e/32.png) [@sprayer\_1](https://forums.chaos.com/u/sprayer_1)\ **Post date:** [January 23, 2017, 12:50pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/9 "2017-01-23T12:50:02Z")
![GD6OYA](https://europe1.discourse-cdn.com/chaosprd/original/4X/5/d/f/5df43f13a5a3b1917746e5a497d4be36e5ac6bde.jpeg) water with absorbtion, two lights, one with directionality and occlude off for light cone and other without directionality for lightning surface. With ies will be better ---
**Author:** ![sylphx](https://avatars.discourse-cdn.com/v4/letter/s/91b2a8/32.png) [@sylphx](https://forums.chaos.com/u/sylphx)\ **Post date:** [January 23, 2017, 4:46pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/10 "2017-01-23T16:46:57Z")
> [@maru](#): > > I am pretty sure this could be easily merged into a single material for an easier setup and better performance. I tried it with one consolidated material, but self-illumination looks too flat and unrealistic when compared with emission from the volume material ---
**Author:** ![giozaha\_1](https://avatars.discourse-cdn.com/v4/letter/g/73ab20/32.png) [@giozaha\_1](https://forums.chaos.com/u/giozaha_1)\ **Post date:** [July 24, 2017, 11:21am UTC](https://forums.chaos.com/t/underwater-pool-light/135909/11 "2017-07-24T11:21:59Z")
I have tried the method with the 2 materials, thank you for the tip! Now there is a problem with the depth of the pool. If anyone has a better solution I would be grateful. ![170722_cam_int_02_PP.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/e/1/e100222e42bd887a3a874137393b7c264cef460a.jpeg) ---
**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:** [July 24, 2017, 12:50pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/12 "2017-07-24T12:50:37Z")
I don’t see any problem here. This would happen in real life too. Make sure that you are using water’s IOR of 1,33. If you want to fake it, and make the pool appear “deeper” you can experiment with altering the IOR. ---
**Author:** ![giozaha\_1](https://avatars.discourse-cdn.com/v4/letter/g/73ab20/32.png) [@giozaha\_1](https://forums.chaos.com/u/giozaha_1)\ **Post date:** [July 24, 2017, 6:10pm UTC](https://forums.chaos.com/t/underwater-pool-light/135909/13 "2017-07-24T18:10:05Z")
I uploaded a real world example for reference. The goal is to have a better understanding of the pool tiles at a night version with the pool lights. Maybe rendering twice with and without volumetric effect and then blend them at PP can do the trick. I will try it and I will post it as soon as I find some time. ![IMG_2980.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/2/0/20eee97dff63660f67400ad3ffd37905938eec7f.jpeg)