Regression: The same glass shader works in different ways #120380

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Holvee · 2024-04-07T19:13:17+02:00

Holvee commented

2024-04-07 19:13:17 +02:00

Operating system: Windows 10 (22H2)
Graphics card: EVGA 3080 / 552.12 nVidia driver

Blender Version
Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-14 21:32, hash: dd9a92785acc
Worked: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-06 21:11, hash: 93728fee53dc

Short description of error
As you can see glass shader as called architectural stack - works differently between versions 3.6 and 4.1

The project is made in 3.6.10 LTS. You can make a copy from it and test the same frame in 4.1.
The difference will be obvious, there is less light coming into the room - the reason is unknown.

Operating system: Windows 10 (22H2) Graphics card: EVGA 3080 / 552.12 nVidia driver **Blender Version** Broken: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-14 21:32, hash: `dd9a92785acc` Worked: version: 4.0.0 Alpha, branch: main, commit date: 2023-08-06 21:11, hash: `93728fee53dc` **Short description of error** As you can see glass shader as called architectural stack - works differently between versions 3.6 and 4.1 The project is made in 3.6.10 LTS. You can make a copy from it and test the same frame in 4.1. The difference will be obvious, there is less light coming into the room - the reason is unknown.

neardoor_glass.blend

85 MiB

3.6.png

5.8 MiB

4.1.png

5.9 MiB

👀 1

Holvee added the

labels 2024-04-07 19:13:18 +02:00

Iliya Katushenock changed title from ~~The same glass shader works in different ways~~ to Regression: The same glass shader works in different ways

2024-04-07 19:17:54 +02:00

Iliya Katushenock added

and removed

labels 2024-04-07 19:18:10 +02:00

Iliya Katushenock commented

2024-04-07 19:21:11 +02:00

@Alaska Can you check?/

Iliya Katushenock commented

2024-04-07 19:28:53 +02:00

Potential causes:
2ac0b36e4e
2ac0b36e4e
52ed6a216f

Potential causes: 2ac0b36e4edaee4a99de907b0762b17d540430a9 2ac0b36e4edaee4a99de907b0762b17d540430a9 52ed6a216fb08d194284592e5f6ac8f0548c39a6

Fernando Alcala commented

2024-04-07 21:45:08 +02:00

The Principled BSDF went through a lot of changes. You can see this by changing the walls and floor to diffuse, the lighting in the room is the same on 3.6.5

and 4.0.2

Leaving the window frame's material lets us see the difference. Stuff is darker because of the better conservation of energy.

The Principled BSDF went through a lot of changes. You can see this by changing the walls and floor to diffuse, the lighting in the room is the same on 3.6.5 ![4m8s 365.png](/attachments/cf537454-54f9-4230-b04d-9d6c02f52bbb) and 4.0.2 ![4m19s 402.png](/attachments/2a38a6be-1d77-42d6-af15-0373a8cb0525) Leaving the window frame's material lets us see the difference. Stuff is darker because of the better conservation of energy.

4m8s 365.png

4.7 MiB

4m19s 402.png

4.7 MiB

Alaska commented

2024-04-08 01:40:36 +02:00

As @Fernando-Alcala pointed out, the amount of light entering the room is the same between Blender 3.6.X and 4.0.X

The differences originate from the energy conservation changes that occurred in the Principled BSDF during 4.0's development.

I am closing this report as expected behaviour.

As @Fernando-Alcala pointed out, the amount of light entering the room is the same between Blender 3.6.X and 4.0.X The differences originate from the energy conservation changes that occurred in the Principled BSDF during 4.0's development. I am closing this report as expected behaviour.

👍 1

Alaska closed this issue

2024-04-08 01:40:40 +02:00

Blender Bot added

and removed

labels 2024-04-08 01:40:46 +02:00

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