Light Leak...again

The Twilight Render Team shares tips, ideas, helpful hints, and more on using Twilight Render
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TSPCo
Posts: 60
Joined: Thu Jan 12, 2012 1:48 am

Light Leak...again

Post by TSPCo » Fri Jan 25, 2019 4:02 am

Two models, same modeling technique, same lights, one leaks one doesn't, both rendered today. Same render settings
The model with the excessive light leaking was created today. No, the light is not coming from the high windows, it did it without those in place, but it is coming from above...somewhere. I raised the perimeter, 'parking area' up halfway, still has light coming from above, or so it appears.
75x150-1_Scene 1flat.jpg
75x150-1_Scene 1flat.jpg (153.21 KiB) Viewed 3732 times
newvannier_Scene 1.jpg
newvannier_Scene 1.jpg (270.63 KiB) Viewed 3732 times

Fletch
Posts: 11225
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2013-20
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Re: Light Leak...again

Post by Fletch » Fri Jan 25, 2019 10:46 am

To avoid light leaks:
Build all surfaces with real-world thickness (walls, floor, ceiling)
Set proper photon shooting and final gathering for your scene.

If your model is built with thickness, then you may need to increase photon shooting and final gather.
Easiest way to do that is to choose a higher quality render settings. If rendering on "Low" try using "Medium", and so on.
If you prefer to keep "Low" setting - try the "01.SunSkyLow" render setting under the Sun-Sky render settings. The final gather and photon shooting is set much higher in those settings, as they presume a fewer number of lights (it assumes 2 lights in the scene, aka the Sun and the Sky).
Or you can create your own render setting:
v2 Pro users can right click any render setting and choose to edit the setting within SketchUp.
Hobby users can open the settings in a program such as Notepad++ to edit them
NOTE: save a copy of the file, don't overwrite your default render settings.
How to Modify Twilight Render Setting

TSPCo
Posts: 60
Joined: Thu Jan 12, 2012 1:48 am

Re: Light Leak...again

Post by TSPCo » Fri Jan 25, 2019 11:38 am

Thanks!, still on the fence about Pro although, but I will look into it again.

Fletch
Posts: 11225
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
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Re: Light Leak...again

Post by Fletch » Sun Feb 17, 2019 4:38 pm

Fletch wrote: Fri Jan 25, 2019 10:46 am To avoid light leaks:
Build all surfaces with real-world thickness (walls, floor, ceiling)...

Fletch
Posts: 11225
Joined: Fri Mar 20, 2009 2:41 pm
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Re: Light Leak...again

Post by Fletch » Sun Feb 24, 2019 7:32 pm

:^:
Every great rendering starts with a great model. :)

Fletch
Posts: 11225
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Re: Light Leak...again

Post by Fletch » Fri Jan 24, 2020 11:08 am

Don't forget the SunSky settings - they were designed to reduce or eliminate light leaks or flares when a scene has very few lights or the light sources are far away, like only sun and sky.
Attachments
sun-sky-render-settings.jpg
sun-sky-render-settings.jpg (65.18 KiB) Viewed 2370 times

Fletch
Posts: 11225
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2013-20
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Re: Light Leak...again

Post by Fletch » Tue Mar 17, 2020 8:07 pm

Another way to eliminate these light leaks is to turn all white surfaces (default face color in SketchUp) to medium (50-70%) grey.

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