C4D R20 Volume Mesher Motion Blur

[jeremyshin]

Hi Octane Community,

Simple question :
I am trying to get Motion Blur on a Volume Mesher object. Nothing is working, I tried baking to Alembic but I don't have any Vertex Maps generated that I could use with " Vertex Speed " option in Motion Blur tab.

Any help about this ?

Thanks

[aoktar]

Do you have constant amount triangles and vertex motion blur enabled for object? Most importantly did you read manual for motion blur?

[jeremyshin]

Yes Aoktar, I read the manual at Motion Blur section maybe 5 times.
I don't have a constant amount of polygons because my animated meshes are merging and seperating along the animation. It is kind of organic.

Motion Blur in manual mostly covers RealFlow plugin. Unfortunately it is not a working workflow for Volume Mesher.

As I am working with 30 fps, my shutter speed is 1/60.
I tried Transform Vertex mode, and even after trying to bake the Volume Mesher Object as Alembic I still don't see any motion blur.

Am I missing something ?
Thanks for your help Aoktar

[aoktar]

With "transform/vertex" option, you should have a constant amount of vertices. Otherwise It will not generate motionblur.
Second alternative, vertex speed option. There you should provide three "speed component" as vertexmap tags. Otherwise It will not work.
It works with RealFlow, because it generates these componenets. But I cannot know how you can supply it with "Volume Mesher".

[jeremyshin]

Thanks Aoktar, I already knew all those informations, that's why I come here to ask for other solutions, because none of those technics worked.

So it is basically impossible to get native Octane Motion Blur with new C4D Volume Mesher Object if amount of vertices is not constant ?
Last solution would be doing it in post ? Which is quite sad in my opinion.

Could you clarify those points ?

Thanks,
Jeremy

[bepeg4d]

If you cannot obtain the vertex velocity, a workaround is to try with sub frame motion blur:

ciao Beppe

[jeremyshin]

Thank you very much Beppe, I didn't know that, I will experiment it. Should I disable all other Octane Camera Motion blur when applying Sub frame motion blur ?

[Jukyan]

Hi there,

i'm in a similar situation,
i need motion-blur for a massive alembic cached simulation.
Sub-frame motion blur is definitely out of question (resolution is 6800kx3540 with a 400GB particles cache)

Its frustrating to have the Volume Mesher being unable to extract velocity...
I saw this video here extracting data from the cache,
could somehow something like this be done ? Even through xpresso ?
https://vimeo.com/showcase/4030127/video/269503540

I could do a lower res version by importing the simulation mesh directly and it works with MB, but in full duration & full res its way too big (above 2TB...)
Any help is very welcome !

[bepeg4d]

Hi,
if the number of vertices is not constant, you need Velocity X, Y, Z tags on the Alembic object to be able to set the Motion Blur in Vertex Speed mode:

ciao,
Beppe

[jeppenorgaardkristoffersen]

Hey Beppe!
I think your answer here with the Velocity X, Y, Z tags are what i'm looking for.
However after spending all last night searching the web for elaboration on that method, and trying several things in C4D myself, i cannot for the life of me figure out what the setup is.
Can you please be so kind as to elaborate how you setup the "Velocity X, Y, Z tags"?

Best regards <3