# Vray RT CPU, GPU, Bump , reflection maps and SKY Issues. **URL:** \ **Category:** Issues\ **Tags:** adv, cpu, gpu, issues, vray-rt\ **Created:** [January 13, 2016, 3:55am UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705 "2016-01-13T03:55:10Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Donfarese](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Donfarese](https://forums.chaos.com/u/Donfarese)\ **Post date:** [January 13, 2016, 3:55am UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/1 "2016-01-13T03:55:10Z")
We are still having Issues with RT, in CPU and GPU. It doesn’t match ADV nor does it look right at all. We have sent this issue in a few times and it’s still there, we cannot complete our projects because of this. As you can see below, RT has issues rendering bump and reflection maps using CPU, but mostly with GPU the main reason we use Vray RT. Also I now found testing this out that the Vraysky doesn’t match either as you can see in the rendering below with the VraySun. I put together a simple scene to show the issues and included one with HDRI & VraySky, and included rendering below. Unfortunately the HDRI scene is to large to post on the forum, but the vray sky scene shows the issues just fine. Hopefully we can finally get this resolved. ![Vray Comparison Bump.jpg](https://europe1.discourse-cdn.com/chaosprd/original/3X/7/5/7579b8fdf00df3d389ecb00e074c270267ec50be.jpeg) ![Vray Comparison Bump VraySun.jpg](https://europe1.discourse-cdn.com/chaosprd/original/2X/d/dc4698dc4717acc04502cbb6488e8108cb76d823.jpeg) [Vray Comparison VraySun.zip](https://forums.chaos.com/uploads/short-url/x89zv24cqqKwqekkP1SMHyjdNu6.zip) (7.06 MB) ---
**Author:** ![matanov](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/matanov/32/21656_2.png) [@matanov](https://forums.chaos.com/u/matanov)\ **Post date:** [January 13, 2016, 9:05am UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/2 "2016-01-13T09:05:01Z")
The bump reflections issue is kind of known one and the priority will be changed. The other one with the different gradient of the horizon is logged thanks to your report. ---
**Author:** ![Donfarese](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Donfarese](https://forums.chaos.com/u/Donfarese)\ **Post date:** [January 13, 2016, 5:16pm UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/3 "2016-01-13T17:16:20Z")
Appreciate it, any time-frame on when this can be fixed. Need to know what to do for production. ---
**Author:** ![vlado](https://avatars.discourse-cdn.com/v4/letter/v/779978/32.png) [@vlado](https://forums.chaos.com/u/vlado)\ **Post date:** [January 13, 2016, 9:09pm UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/4 "2016-01-13T21:09:41Z")
You might get more consistent results by using normal maps. The effect of bump mapping is very sensitive to the way the calculations are performed and although the code for both CPU and GPU is roughly the same, for very fine bump maps the differences are enough to alter the overall look. Best regards, Vlado ---
**Author:** ![Donfarese](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Donfarese](https://forums.chaos.com/u/Donfarese)\ **Post date:** [January 14, 2016, 1:51am UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/5 "2016-01-14T01:51:30Z")
That is a no go Vlado, both normal maps and Bump Maps do not look the same or right. Our scenes are coming out looking very odd, we thought it was us until we finally changed over to ADV to test it and found out it’s RT. This is a really huge problem, we are set up here for GPU rendering. Do you have a time frame on when this might get fixed, we are at a stand still. ---
**Author:** ![Donfarese](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Donfarese](https://forums.chaos.com/u/Donfarese)\ **Post date:** [January 16, 2016, 6:14pm UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/6 "2016-01-16T18:14:23Z")
Any update, we are still scratching our heads over here on what to do? ---
**Author:** ![svetlozar.draganov](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/svetlozar.draganov/32/53004_2.png) [@svetlozar.draganov](https://forums.chaos.com/u/svetlozar.draganov)\ **Post date:** [January 18, 2016, 8:24am UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/7 "2016-01-18T08:24:28Z")
We are sorry to report but we do not have any progress on the issues so far. We’ll keep you posted. ---
**Author:** ![Donfarese](https://avatars.discourse-cdn.com/v4/letter/d/a9a28c/32.png) [@Donfarese](https://forums.chaos.com/u/Donfarese)\ **Post date:** [January 19, 2016, 4:09am UTC](https://forums.chaos.com/t/vray-rt-cpu-gpu-bump-reflection-maps-and-sky-issues/56705/8 "2016-01-19T04:09:20Z")
Thank you for the update, this is pretty huge issue, I don’t know of any scene that doesn’t use bump or reflection maps. Hope there is a solution to this soon.