Default Sun Disc intensity in Nishita sky texture is about 10 times less brighter than default Sun Lamp intesity. #79249

New Issue

Lissanro Rayen · 2020-07-25T00:07:16+02:00

Lissanro Rayen commented

2020-07-25 00:07:16 +02:00

System Information
Operating system: Ubuntu 20.04 LTS
Graphics card: NVidia GTX SUPER 2060 8GB

Blender Version
Broken: Blender 2.91.0 Alpha (July 23, 23:28:44- 698af2e774)
Worked: N/A

Short description of error

Exact steps for others to reproduce the error

The issue is reproducible with default cube scene. Here are some screenshots:

Nishita Sky Texture with Sun Intensity = 1 and Background Strength = 1:

If I disable Sun Disc in Nishita and enable Sun Lamp with Strength = 1, ground is well illuminated but the sky is too dark:

If I increase Background Strength to 10 (alternatively, I could have decreased Sun Lamp Strength to 0.1 and increase exposure), the result looks better, sky is sufficiently bright:

Then if I disable Sun Lamp, enable Sun Disk in Nishita Sky Texture and keep Background Strength = 10, I get very similar result:

If there is a reason for this difference and it is intentional feature and not a bug, feel free to close this issue as invalid.

**System Information** Operating system: Ubuntu 20.04 LTS Graphics card: NVidia GTX SUPER 2060 8GB **Blender Version** Broken: Blender 2.91.0 Alpha (July 23, 23:28:44- 698af2e774b5) Worked: N/A **Short description of error** **Exact steps for others to reproduce the error** The issue is reproducible with default cube scene. Here are some screenshots: Nishita Sky Texture with Sun Intensity = 1 and Background Strength = 1: ![Screenshot_20200724_201907.png](https://archive.blender.org/developer/F8718779/Screenshot_20200724_201907.png) ![Nishita Sky Texture with Sun Intensity = 1 and Background Strength = 1.png](https://archive.blender.org/developer/F8718798/Nishita_Sky_Texture_with_Sun_Intensity___1_and_Background_Strength___1.png) If I disable Sun Disc in Nishita and enable Sun Lamp with Strength = 1, ground is well illuminated but the sky is too dark: ![Nishita Sky Texture with no Sun Disk, Background Strength = 1 and Sun Lamp with Strength = 1.png](https://archive.blender.org/developer/F8718800/Nishita_Sky_Texture_with_no_Sun_Disk__Background_Strength___1_and_Sun_Lamp_with_Strength___1.png) If I increase Background Strength to 10 (alternatively, I could have decreased Sun Lamp Strength to 0.1 and increase exposure), the result looks better, sky is sufficiently bright: ![Nishita Sky Texture with no Sun Disk, Background Strength = 10 and Sun Lamp with Strength = 1.png](https://archive.blender.org/developer/F8718806/Nishita_Sky_Texture_with_no_Sun_Disk__Background_Strength___10_and_Sun_Lamp_with_Strength___1.png) Then if I disable Sun Lamp, enable Sun Disk in Nishita Sky Texture and keep Background Strength = 10, I get very similar result: ![Nishita Sky Texture with Sun Intensity = 1 and Background Strength = 10.png](https://archive.blender.org/developer/F8718898/Nishita_Sky_Texture_with_Sun_Intensity___1_and_Background_Strength___10.png) If there is a reason for this difference and it is intentional feature and not a bug, feel free to close this issue as invalid.

Lissanro Rayen commented

2020-07-25 00:07:16 +02:00

Added subscriber: @Dragon.Studio

Lissanro Rayen changed title from ~~Default Sun Disc intensity in Nishita sky texture is about 10 times less than default Sun Lamp intesity.~~ to Default Sun Disc intensity in Nishita sky texture is about 10 times less brighter than default Sun Lamp intesity.

2020-07-25 00:07:39 +02:00

Marco commented

2020-07-25 12:16:37 +02:00

Added subscriber: @nacioss

Marco commented

2020-07-25 12:16:37 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Marco closed this issue

2020-07-25 12:16:37 +02:00

Marco self-assigned this 2020-07-25 12:16:37 +02:00

Marco commented

2020-07-25 12:16:37 +02:00

This is not a bug.
The Sun lamp Strength value is in W / m^2 (irradiance) and so to "match" the sky texture sun values you should put values between 500 and 900 in the Strength.

This is not a bug. The Sun lamp Strength value is in W / m^2 (irradiance) and so to "match" the sky texture sun values you should put values between 500 and 900 in the Strength.

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Default Sun Disc intensity in Nishita sky texture is about 10 times less brighter than default Sun Lamp intesity. #79249