IOR with GGX bug

[alperenozgur]

if i plug IOR map to ior slot and i change reflection mode to GGX its sometimes creating stragne black artifacts around edges of object in render time. it's random sometimes happens sometimes not and ii never saw it in blinn, phong or ward. i think it's only happens in GGX and sometimes its dissapears if i tweak around randomly but couldnt find what solves that problem. is it known bug and anybody have a solution?

[vlado]

It sounds like a bug. Do you have a scene that has the problem, even if appears randomly?

Best regards,
Vlado

[alperenozgur]

It sounds like a bug. Do you have a scene that has the problem, even if appears randomly?

Best regards,
Vlado

i deleted it completely. i will try to reproduce it. where should i send it?

[alperenozgur]

It sounds like a bug. Do you have a scene that has the problem, even if appears randomly?

Best regards,
Vlado

here is the screenshots and wetransfer file up for 7 days



scene: https://we.tl/cczpp0hVab

[alperenozgur]

It sounds like a bug. Do you have a scene that has the problem, even if appears randomly?

Best regards,
Vlado

UPDATE: it is also strongly related to bump/normal map i think. because black artifacts dissapearing when i lower the bump multiplier below "1"

[Rens]

Yeah it looks like the normals have been pushed too far, and GGX might be a bit more sensitive for that.

[alperenozgur]

Yeah it looks like the normals have been pushed too far, and GGX might be a bit more sensitive for that.

so its bug or not? if it's not bug how do i solve this without losing my normal detail?

[tashko.zashev]

so its bug or not? if it's not bug how do i solve this without losing my normal detail?

Hi,
It can be considered as a bug or feature improvement and we have logged it into our system. We will let you know as soon as we have any news on this issue.

[alperenozgur]

Hi,
It can be considered as a bug or feature improvement and we have logged it into our system. We will let you know as soon as we have any news on this issue.

hi. thank you for informing. i hope you solve it soon.

[alperenozgur]

Hi,
It can be considered as a bug or feature improvement and we have logged it into our system. We will let you know as soon as we have any news on this issue.

It sounds like a bug. Do you have a scene that has the problem, even if appears randomly?

Best regards,
Vlado

i noticed something. i was changing materials' brdf types because of GGX showing that black artifacts and to compare different BRDFs and i returned back to GGX and now artifacts gone in the materials i cycled BRDF type :S even in extreme angles there is no artifacts lol.. i dont know if it's random or not but if you can guys think of why it's gone, at least i can use this workaround till you guys fix this. will try in future scenes too.

[svetlozar.draganov]

Good to know you've found a way to workaround the issue but it is still a good idea to send us the scene for investigation since this might be a bug in the software.

[alperenozgur]

Good to know you've found a way to workaround the issue but it is still a good idea to send us the scene for investigation since this might be a bug in the software.

i already sended the scene in earlier reply. it's not scene specific btw. and also workaround is random solution. it's still happening. just wanted to update.

[svetlozar.draganov]

The file is no longer available for download unfortunately.

[svetlozar.draganov]

No need to upload the file again, someone already reported that issue as a bug and the scene is attached to it.
We'll get back to you when we have some progress about it.

[alperenozgur]

No need to upload the file again, someone already reported that issue as a bug and the scene is attached to it.
We'll get back to you when we have some progress about it.

i am the "someone" you mentioned i really cant couldnt know how i can reply your earlier post lol.. glad you catched up.