# V-Ray RT CUDA LC+BF

**URL:** <https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093>\
**Category:** Issues\
**Created:** [June 8, 2015, 11:52am UTC](https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093 "2015-06-08T11:52:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![wyszolmirski](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/wyszolmirski/32/29701_2.png) [@wyszolmirski](https://forums.chaos.com/u/wyszolmirski)\
**Post date:** [June 8, 2015, 11:52am UTC](https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093/1 "2015-06-08T11:52:48Z")

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Hi,

I seem to not be able to get nice flicker-free animation when using LC + BF in RT CUDA. I played with very high settings, light leaks option, retrace. Nothing gives good results.

Is there some kind of bug in current build? I don’t remember it to be so bad with SP1.

Best,

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**Author:** ![savage309](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/savage309/32/40144_2.png) [@savage309](https://forums.chaos.com/u/savage309)\
**Post date:** [June 8, 2015, 12:26pm UTC](https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093/2 "2015-06-08T12:26:25Z")

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Do you mean BF+LC and not LC+BF ?  
Can you provide sample scene that shows the issue ?

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<div class="post-metadata">

**Author:** ![wyszolmirski](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/wyszolmirski/32/29701_2.png) [@wyszolmirski](https://forums.chaos.com/u/wyszolmirski)\
**Post date:** [June 8, 2015, 12:44pm UTC](https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093/3 "2015-06-08T12:44:52Z")

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Yes. I mean BF+LC. Wrote it in the order it gets calculated :).

Anyway I can send scenes to the support and refer to this thread.

Best,

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<div class="post-metadata">

**Author:** ![savage309](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/savage309/32/40144_2.png) [@savage309](https://forums.chaos.com/u/savage309)\
**Post date:** [June 8, 2015, 2:06pm UTC](https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093/4 "2015-06-08T14:06:54Z")

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> [@On another topic](https://forums.chaos.com/t/47827/2):
>
> Yes. I mean BF+LC. Wrote it in the order it gets calculated :).
> 
> Anyway I can send scenes to the support and refer to this thread.
> 
> Best,

Thanks, this would help a lot to figure out what is going on.

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<div class="post-metadata">

**Author:** ![wyszolmirski](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/wyszolmirski/32/29701_2.png) [@wyszolmirski](https://forums.chaos.com/u/wyszolmirski)\
**Post date:** [June 8, 2015, 2:12pm UTC](https://forums.chaos.com/t/v-ray-rt-cuda-lc-bf/54093/5 "2015-06-08T14:12:08Z")

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> [@On another topic](https://forums.chaos.com/t/47836/4):
>
> Thanks, this would help a lot to figure out what is going on.

I’ve sent it to support, so you should get the links to 2 scenes where this happens.

Best,