Light Issue

For all the users of Twilight Render (V1 & V2), to ask questions and get started
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JAFisher44
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Joined: Tue Jul 13, 2021 3:32 am

Light Issue

Post by JAFisher44 » Tue Jul 13, 2021 3:42 am

I just started using Twilight and for the life of me I can't figure out how to get the images I want. I build Star Trek ships in Sketchup and I just want a simple clean render with a black background and omnidirectional ambient lighting. I wan the item evenly lit from every direction. Is this something Twilight can do?

Fletch
Posts: 12895
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2016-2023
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Re: Light Issue

Post by Fletch » Wed Jul 14, 2021 3:58 pm

Learning a new software can be frustrating. Please have patience while you learn the ropes.
Please watch the getting started video tutorial series linked in my signature.

Open Edit Environment dialog and from Presets (bottom right little button) choose "Ambient".
Attachments
ambient.png
ambient.png (78.02 KiB) Viewed 4398 times

Fletch
Posts: 12895
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
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Re: Light Issue

Post by Fletch » Wed Jul 14, 2021 5:26 pm

JAFisher44 wrote: Tue Jul 13, 2021 3:42 am with a black background and omnidirectional ambient lighting.
If you want background black, but light from all around you will have to render a mask and place the object on a black background. Render with lighting shown in post above.

Subject: How to use the Alpha Mask / Alpha Channel

Fletch
Posts: 12895
Joined: Fri Mar 20, 2009 2:41 pm
OS: PC 64bit
SketchUp: 2016-2023
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Re: Light Issue

Post by Fletch » Wed Jul 14, 2021 6:06 pm

Use "Background Color" and choose pure black.

Build a cube around your object. Apply an emitter material to that cube and reverse the faces so that the faces aim towards the inside of the cube. Put that cube around your spaceship.
Set the emitter material type to "invisible".

Now you have black sky and ambient light from all around your object.

You can also use "background fit image", use a starry night sky background or whatever image you like. Set your rendered image size to match the aspect ratio of the sky image. (seems to work best with .jpg images for some reason as opposed to png)

Best is to create a starry sky spherical sky, or find one online, then use that in spherical sky slot. you can still use the ambient light box described above and shown in attached .skp scene.

Attached scene as example.
Attachments
spaceship_Scene 1.jpg
spaceship_Scene 1.jpg (105.46 KiB) Viewed 4387 times
Nebula Space Environment lores.jpg
Nebula Space Environment lores.jpg (202.14 KiB) Viewed 4387 times
spaceship_Scene 1-starry.jpg
spaceship_Scene 1-starry.jpg (224.66 KiB) Viewed 4385 times

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