# I still don't understand how reflection probes could help reflecting all the scene **URL:** \ **Category:** Questions\ **Created:** [May 7, 2019, 2:47pm UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032 "2019-05-07T14:47:14Z")\ **Posts on this page:** 7\ **Page:** 2
**Author:** ![christopheC](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/christophec/32/19780_2.png) [@christopheC](https://forum.babylonjs.com/u/christopheC)\ **Post date:** [December 14, 2021, 9:10am UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/21 "2021-12-14T09:10:19Z")
Hi @carolhmj, thanks for checking on me šŸ™‚ I unfortunately got sidetracked by other parts of my projects and didnā€™t get a chance to look at this thoroughly but to be honest I donā€™t really know where to start from so I would absolutely love some help! Is this something youā€™ve done before? any pointers would be very welcome. Thanks again. Chris ---
**Author:** ![carolhmj](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/carolhmj/32/25918_2.png) [@carolhmj](https://forum.babylonjs.com/u/carolhmj)\ **Post date:** [December 14, 2021, 2:41pm UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/22 "2021-12-14T14:41:09Z")
Havenā€™t done it before (well, only reflections in ray tracing which is easier) but thereā€™s always a first time! šŸ¤£ Iā€™m trying to tinker with @Vinc3r 's idea of cloning the texture, but instead of using .`clone()`, trying to copy the texture pixels so we donā€™t get the framebuffer loop: [Testing reflection probes | Babylon.js Playground (babylonjs-playground.com)](https://www.babylonjs-playground.com/#K030U0#25) Itā€™s not working yet, I think instead of just calling `scene.render()` just once like Iā€™m doing, this process will need to be repeated on each frame, or we need some other way to guarantee the reflection probe will only run when the rest of the scene is ready. ---
**Author:** ![carolhmj](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/carolhmj/32/25918_2.png) [@carolhmj](https://forum.babylonjs.com/u/carolhmj)\ **Post date:** [December 14, 2021, 2:57pm UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/23 "2021-12-14T14:57:42Z")
Ooop ooop that wasnā€™t it! I just set `generateMipmaps` to false on the probe and it worked! šŸ˜® [Testing reflection probes | Babylon.js Playground (babylonjs-playground.com)](https://www.babylonjs-playground.com/#K030U0#27) EDIT: oh shoot, still the feedback loop message ā˜¹ EDIT2: Third try! I feel this one is cheaty butā€¦ It doesnā€™t result in a loop and might be better performance wise if there are fewer reflective objects? I created a copy of the object we want to apply the probe on and also render, but with the reflection texture not applied to it. So the probe renders the non reflective version, and I apply the probe to the reflective one: [Testing reflection probes | Babylon.js Playground (babylonjs-playground.com)](https://www.babylonjs-playground.com/#K030U0#31) First I was ā€œhidingā€ the non reflective version from the final scene by making it a bit smaller than the reflective, so that it was hidden inside, but layer masks also seem to work! ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/7/7/77992a1932d4cc7587f086f2b1b80e8ba80405d0.png) If you pay attention you can see it isnā€™t the same reflection, but itā€™s an ok approximation if you donā€™t need anything very detailed. ---
**Author:** ![christopheC](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/christophec/32/19780_2.png) [@christopheC](https://forum.babylonjs.com/u/christopheC)\ **Post date:** [December 15, 2021, 11:50am UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/24 "2021-12-15T11:50:46Z")
Thanks so much for spending time on this @carolhmj! This could work really well for me! Correct me if Iā€™m wrong but it does mean that I have to double up any object and materials that will use that reflection probe, right? Chris ---
**Author:** ![carolhmj](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/carolhmj/32/25918_2.png) [@carolhmj](https://forum.babylonjs.com/u/carolhmj)\ **Post date:** [December 15, 2021, 2:08pm UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/25 "2021-12-15T14:08:18Z")
> [@christopheC](#): > > Correct me if Iā€™m wrong but it does mean that I have to double up any object and materials that will use that reflection probe, right? Thatā€™s correct! I was tinkering with a way to optimize it (Iā€™m finding this really fun šŸ¤£ ), and one option could be to use a simplified version of the mesh for the reflection. I built this veeery ugly one from spheres and cubes: ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/f/3/f32d68d2e4c88432eac1def06d59bdafcfd8c583.png) Placed it along our proper Suzanne: ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/b/b/bb978ffffa7722eceffa1d1d5584144dc3281cdd.png) Aaaand ran the reflection probe again: ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/7/2/729983dcda58a8da285ce760bd17dc227ab68614.png) At that distance, itā€™s pretty hard to distinguish the reflections with the original and simplified meshes, and even more if the reflective material has a bit of bump/roughness, which would distort/blur the reflection: ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/c/d/cdf26cc7e79bd220b2b2999c3e3e5af567adda81.jpeg) Updated version with these experiments: [Testing reflection probes | Babylon.js Playground (babylonjs-playground.com)](https://www.babylonjs-playground.com/#K030U0#32) šŸ˜ƒ ---
**Author:** ![Vinc3r](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/vinc3r/32/25340_2.png) [@Vinc3r](https://forum.babylonjs.com/u/Vinc3r)\ **Post date:** [December 15, 2021, 3:58pm UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/26 "2021-12-15T15:58:32Z")
Iā€™m playing to Mafia 3 these days, and Iā€™ve noticed it seems theyā€™re disabling a lot of render properties for the rear-view mirror. Maybe theyā€™re doing a kind of trick like you do: using a ghost scene for this mirror plane. (I, until now, donā€™t payed attention about details in the cubemaps used for the car body, 'will check next time Iā€™ll launch the game) ![a](https://i.imgur.com/ec4ShLU.jpg) ---
**Author:** ![jelster](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/jelster/32/25881_2.png) [@jelster](https://forum.babylonjs.com/u/jelster)\ **Post date:** [December 15, 2021, 4:03pm UTC](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032/27 "2021-12-15T16:03:37Z")
Maybe theyā€™re using a lower LOD for the meshes rendered in the Rear view mirror there? Would obviate need for a ghost scene Iā€™d thinkā€¦ [Previous page](https://forum.babylonjs.com/t/i-still-dont-understand-how-reflection-probes-could-help-reflecting-all-the-scene/3032.md?page=1)