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Problem with volume fog and opacity textures

Posted: Wed Jul 29, 2015 1:19 am
by Rikk The Gaijin
Hi, I've noticed this annoying issue when I use a combination of volume fog with opacity textures (applied to alpha cards)
Screenshot_3.jpg
Screenshot_3.jpg (14.83 KiB) Viewed 3184 times
As you can see, the polygon with the opacity texture is clearly visible through the volume fog.
Any solution/workaround?

Re: Problem with volume fog and opacity textures

Posted: Wed Jul 29, 2015 4:07 am
by haze
Hi, I think a similar issue was solved a few days ago (probably on its way for the next release), but I'm not sure this is exactly the same. What are your kernel settings for alpha shadows, alpha channel and keep environment?

Re: Problem with volume fog and opacity textures

Posted: Wed Jul 29, 2015 4:17 am
by Rikk The Gaijin
mist wrote:Hi, I think a similar issue was solved a few days ago (probably on its way for the next release), but I'm not sure this is exactly the same. What are your kernel settings for alpha shadows, alpha channel and keep environment?
I tried all kernels, and played around with all possible settings, but nothing helps. It's a bug, I think. :(
Can you link the thread where this was discussed few days ago?

Re: Problem with volume fog and opacity textures

Posted: Wed Jul 29, 2015 9:56 pm
by haze
Sorry - my mistake, the issue I mentioned was actually not in the stable releases.

edit: have reproduced the problem, will provide an update asap.

Re: Problem with volume fog and opacity textures

Posted: Wed Jul 29, 2015 10:40 pm
by manalokos
It happens to me too.

Re: Problem with volume fog and opacity textures

Posted: Thu Jul 30, 2015 12:54 am
by Rikk The Gaijin
mist wrote: edit: have reproduced the problem, will provide an update asap.
Cool, thank you.

Re: Problem with volume fog and opacity textures

Posted: Thu Jul 30, 2015 12:56 am
by haze
As a possible workaround, try to add a float to transmission on the material and set it to zero - let me know if this works

Re: Problem with volume fog and opacity textures

Posted: Thu Jul 30, 2015 1:45 am
by Rikk The Gaijin
mist wrote:As a possible workaround, try to add a float to transmission on the material and set it to zero - let me know if this works
Which material? The alpha card one? Or the fog volume one?

Re: Problem with volume fog and opacity textures

Posted: Thu Jul 30, 2015 1:52 am
by Rikk The Gaijin
Also, I can't plug a float value directly into the Transmission node, Octane doesn't allow me to do it... :?

Re: Problem with volume fog and opacity textures

Posted: Thu Jul 30, 2015 1:55 am
by haze
Try the alpha card one. I meant to say greyscale color texture, not float sorry