OTOY Forums

Hi,

I'm trying to convert a cycles animation to octane, but the particles system looks awful. Does anyone know how to make the particles look realistic in Octane?

I've tried Global, Scatter, Movable, Reshapable, and As Is...none product realistic trails.


https://goo.gl/photos/yuHJGEury2sPbDYp8
This is the cycles version.


https://goo.gl/photos/5jSZQ68LiXuQs1ia8
This is the octane version.

: Cycles

: Octane

Thanks
James

Don't blame yourself, It seems to be the exact same bug we have in Maya with motion-blur and varying particles,
not surprising as we have the same plugin developer :
viewtopic.php?f=110&t=57478

I think the reason is that the particle coordinates list is transmitted to Octane in the reverse order to what it should,
as a result, every time a particle is emitted, IDs are messed-up as-well as motion-blur.

This seems simple to fix, but must be easier to say than to do.

On the Octane version it looks to me that you have a huge amount of fireflies, but if you look carefully you can see that the particles behind them are blurred. Try adding a bit more light to the scene to see if it helps with the fireflies. I think once you get them under control, it will look a lot better. Can you share the scene?

Octane does not create good mb for particles. That bug was there for years

grimm wrote:On the Octane version it looks to me that you have a huge amount of fireflies, but if you look carefully you can see that the particles behind them are blurred. Try adding a bit more light to the scene to see if it helps with the fireflies. I think once you get them under control, it will look a lot better. Can you share the scene?

@grimm, hey,
there is motion blur yes, but it is wrong, eratic, because Octane mix-up particle ID, instead of blurring along the position of the same particle during time, this is blurred between a particle and the position of a different particle.
We have the exact same bug in Maya, and aswell in Max according to Coilbook .

This is very simple to check the problem,
just export to standalone and you will see that the matrix list in the Scatter node is in the reverse order accordingly to how octane use this order to identify each instance.

No problem calus. I did this quick test and it looks like it works fine, but maybe I'm doing something different?

https://vimeo.com/195583227

grimm wrote:I did this quick test and it looks like it works fine, but maybe I'm doing something different?

Indeed, your motion blur is correct because you're using Subframe motion-blur instead of Internal motion-blur.

Subframe motion-blur is just mixing frames rendered at higher frame-rate, no interpolation between time sample so no problem.

Internal motion-blur is the real Octane motion-blur, it is nicer and much faster but don't work correctly with the plugin in this case.


Anyway thanks for pointing this ,
Subframe motion-blur is the way to go for Kraken to workaround this plugin bug with varying particles and internal motion blur.

Subframe will take 5x longer than using Cycles. So that's not really an option.
I can't upload the blend file. its 35MBs and my ISP has throttled my uploads Times out before I can complete the transfer.

Yeah, internal is definitely broken. I don't get any blur when I switch to it and I tried all of the settings and ranges. In fact the particles disappear when they are blurred using the same .blend I posted before. This is with 11.16.

The internal mb only seems to work with moving camera, not with moving objects.

But you can export your scene to orbx format and open up in standalone. then works. just found that out