V-Ray 3.0 Alembic particle

[gramx]

Hi

I have started doing some alembic particle exports from Houdini and rendering them in V-Ray 3 using the V-Ray Proxy loader. So far it's looking very promising! However I have found that when you render motion blur the duration multiplier doesn't work. You always get a full frame of motion blur even if you set it to 0.5, 0.1 or 5. Is this a current limitation?

Also is it possible to assign per particle normal data from the alembic file? this would be really useful.

Thanks

Graham
https://vimeo.com/home/myvideos

[Morne]

proxy motion blur is limited to 1 frame currently

[gramx]

OK, Thanks! I might try halving the amount of the embedded velocities in Houdini before I export and see if that has the effect of a 0.5 motion blur.

[gramx]

Done a test and found that you can control the motion blur length by adding a multiplier to the velocity channel in a VOPsop in Houdini before exporting to alembic.

[Svetlozar Draganov]

Thanks for sharing - that information would be useful for us and someone else with the same issue.

[peterguthrie]

I am currently trying something similar without much success. I am loading a .abc file via vrayproxy and struggling to get motion blur to work. The first time i just tried ticking the motion blur box on my vrayphysicalcamera and amazingly it worked perfectly... but froze at the end of the render, or crashed if i cancelled the render , this was on vray 3.00.03. I downloaded 3.00.05 and didnt get a crash but also didnt get any motion blur. Now I have gone back to 3.00.03 and frustratingly cant get motion blur to work again!

any ideas?

I can send a stripped down file, and dropbox the .abc file

[vlado]

I can send a stripped down file, and dropbox the .abc file

Yes, if you can send it to me at vlado@chaosgroup.com we'll take a look. Which application created the Alembic file, by the way?

Best regards,
Vlado

[peterguthrie]

email sent.

[vlado]

Thanks, looking into it now.

Best regards,
Vlado

[peterguthrie]

Just in case anyone had the same problem as me, the trick was to make vray think it was loading a sequence by renaming the .abc file filename_0000.abc and then in the vrayproxy filename slot change it to filename_####.abc

also, changing the fps when using ply2vrmesh.exe allows me to change the motion blur length without having to go back and re-export the alembic file.

thanks Vlado, all working perfectly now!

[vlado]

Very well then; I hope it will work well as a waterfall for your image

Best regards,
Vlado