# Vray Velocity MotionBlur

**URL:** <https://forum.logik.tv/t/vray-velocity-motionblur/7370>\
**Category:** Flame Questions\
**Tags:** batch\
**Created:** [January 3, 2023, 11:28am UTC](https://forum.logik.tv/t/vray-velocity-motionblur/7370 "2023-01-03T11:28:16Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![finnjaeger](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@finnjaeger](https://forum.logik.tv/u/finnjaeger)\
**Post date:** [January 3, 2023, 11:28am UTC](https://forum.logik.tv/t/vray-velocity-motionblur/7370/1 "2023-01-03T11:28:16Z")

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How does one get the Vray velocity pass to work in flame? I am getting weird results with it jittering all over the place and also not correctly changing the alpha, its just very weird.

The pass works fine in nuke using vectorBlur, is there a better way to do that in flame?

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**Author:** ![La\_Flame](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/la_flame/32/200_2.png) [@La\_Flame](https://forum.logik.tv/u/La_Flame)\
**Post date:** [January 3, 2023, 11:32am UTC](https://forum.logik.tv/t/vray-velocity-motionblur/7370/2 "2023-01-03T11:32:30Z")

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Hi Finn,

Is this equivalent to a motion vectors pass or is the Vray velocity pass something different?

Thanks  
Grant

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<div class="post-metadata">

**Author:** ![finnjaeger](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@finnjaeger](https://forum.logik.tv/u/finnjaeger)\
**Post date:** [January 3, 2023, 12:12pm UTC](https://forum.logik.tv/t/vray-velocity-motionblur/7370/3 "2023-01-03T12:12:28Z")

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Its a motion vectors pass , just called velocity, i dont know exactly how its calculated and how it works, as its vray specific, nuke has a preset for vray velocity passes.

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<div class="post-metadata">

**Author:** ![finnjaeger](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@finnjaeger](https://forum.logik.tv/u/finnjaeger)\
**Post date:** [January 3, 2023, 12:13pm UTC](https://forum.logik.tv/t/vray-velocity-motionblur/7370/4 "2023-01-03T12:13:05Z")

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> **[VRayVelocity - V-Ray for 3ds Max - Chaos Help](https://docs.chaos.com/display/VMAX/VRayVelocity)**

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<div class="post-metadata">

**Author:** ![La\_Flame](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/la_flame/32/200_2.png) [@La\_Flame](https://forum.logik.tv/u/La_Flame)\
**Post date:** [January 3, 2023, 2:35pm UTC](https://forum.logik.tv/t/vray-velocity-motionblur/7370/5 "2023-01-03T14:35:11Z")

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Looking at the example elements, it does not look like a typical motion vectors pass from Arnold or Maya.

Would need to get some samples to do a bit of testing.

Thanks  
Grant