Hair Shader issues

[andrey.krivulya]

Hi, dear Otoy team.

win10, Octane Standalone 2020.1.4

So I found a strange issue in Hair Shader. Albedo texture doesn't work in Octane Standalone.

Video with the issue -> https://www.youtube.com/watch?v=F3A6k8iXTxo

ORBX -> https://bit.ly/2FOaqBx

The same in 3ds Max plugin...

Does this happen only on my side and I'm doing something wrong or this is a known issue? =)

Thank you and have a great weekend.

Best regards,
Andrew.

[linograndiotoy]

Hey Andrew,
Thanks for your report.
May I suggest you build a lighter scene showing the issue? A furry sphere would work. The scene you sent doesn't work properly on my system.

[wallace]

Looks like there is some issue with the albedo mode indeed, I will look into fixing that in 2020.1.

Here's a work around: plug in the same texture to the specular pin of the hair material

[andrey.krivulya]

Hey Andrew,
Thanks for your report.
May I suggest you build a lighter scene showing the issue? A furry sphere would work. The scene you sent doesn't work properly on my system.

Hi, Lino.

Ok. I will create a simple scene for you a little bit later. =)

[andrey.krivulya]

Looks like there is some issue with the albedo mode indeed, I will look into fixing that in 2020.1.

Here's a work around: plug in the same texture to the specular pin of the hair material

Ok. Thank you for letting me know =)

Reference from another render =)



Soon I will create more simple scene and record a video to explain what we should improve in Octane =)

[andrey.krivulya]

Hi, dear Otoy developers =)

So. As I promised, I prepared a less dense scene for your tests - https://bit.ly/2YP4Bdw

But I found a strange issue.

With this simple scene - albedo working as needed,

spec_simple_scene.jpg

but with dog - I have stange bug... Specular in this case didn't help.. Why?

spec_dog_scene.jpg

Thank you and have a great day

Best regards,
Andrew.

[Banti]

Has this bug been fixed by now? Because the Albedo mode still doesnt work for me (in the DAZ plugin) and the specular workaround also doesnt work...

Edit: Ok so this just getting weird now.

This is how the hair looks with only and HDRI:

hdri.png

And this is how it looks with 2 light planes (from above and the side):

planes.png

This is the material (IOR is default value 1.55):

material.PNG

Can someone tell me why this is happening?

[Banti]

So the problem is definitly the light coming directly from above.

This image only has one light plane from above and i set the hair material IOR to 1.1, its still way to specular no?

top.png

[wallace]

Hi,

Yes this issue should be fixed in 2020.2, but only after 2020.1.5.

May I ask for an orbx to confirm this, and also which octane version are you currently at?

[Banti]

Hi,

Yes this issue should be fixed in 2020.2, but only after 2020.1.5.

May I ask for an orbx to confirm this, and also which octane version are you currently at?

This was rendered with the DAZ plugin 2020.1.5. I am not sure if i still have this particular scene saved but i will try to find it.
It should be noted that others on the DAZ plugin topic have pointed out that the issue might have been the fact that this hair is not "strand-based" but a transmapped one. Appearently the hair shader was intended for strand-based hair specifically and will cause problems if used on transmapped ones?

Does that mean after the fix it will work on non strand based hair too?