FumeFX VDB motion vector to maya

[denyas 0]

Hi guys, 

I simulated fumefx vdb with velocity channel in 3DSmax fumefx and i used maya arnold volume to import VDB.

How do i render the the motion vector for the VDB ?

i tried motion vector VDB and it doesn't work. 

any help would be great. thanks

[Howitzer99 21]

I'm not familiar with importing FumeFX into Houdini, but internally for Houdini, it's expecting to have velocity as a vector parameter named "vel" for it to pickup and use motion vectors during rendering.  Check which parameters are coming in from the FumeFX VDBs, you may need to just rename the velocity attribute.

Here's a link from SideFX's site with some more info:

https://www.sidefx.com/forum/topic/43574/

[denyas 0]

19 hours ago, Howitzer99 said:

I'm not familiar with importing FumeFX into Houdini, but internally for Houdini, it's expecting to have velocity as a vector parameter named "vel" for it to pickup and use motion vectors during rendering.  Check which parameters are coming in from the FumeFX VDBs, you may need to just rename the velocity attribute.

Here's a link from SideFX's site with some more info:

https://www.sidefx.com/forum/topic/43574/

 

  Hey million's Thanks for the reply, i got my fumefx to export velocity as VelocitiesX VelocitiesY VelocitiesZ channel.

but i am not sure how do i do the connection in maya. 

[anim 1,215]

13 hours ago, denyas said:

... i got my fumefx to export velocity as VelocitiesX VelocitiesY VelocitiesZ channel.

but i am not sure how do i do the connection in maya. 

just put those names into Velocity Grids parameter as the guide describes

https://docs.arnoldrenderer.com/display/A5AFMUG/Volume#Volume-VelocityGrids

[denyas 0]

9 hours ago, anim said:

just put those names into Velocity Grids parameter as the guide describes

https://docs.arnoldrenderer.com/display/A5AFMUG/Volume#Volume-VelocityGrids

thanks i got it working by using volumefloatrgb and export the xyz channel as rgb 

[Howitzer99 21]

Cool, glad it's working!

[AlexNardini 22]

Hello,

this reply came in very late but you can use this free HDA to handle FumeFX VDB caches inside Houdini, support from VDBs coming from FumeFX v5 and up:

https://www.orbolt.com/asset/alexnardini::FFX_import::2.0

And use its companion HDA for any FumeFX VDB Layout needs:

https://www.orbolt.com/asset/alexnardini::FFXVDD_import::1.0

 

Best,

Alessandro