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I'm a Blender noob and trying to do something I thought would be simple, but is causing me grief. I'm trying to add a sky outside the windows of the classroom scene found in this Blender file I found online.

I've tried the tutorials here and here, and neither of them show any alterations to the scene when I go through the steps. It's like something in the setup of the file is overriding what I'm trying to accomplish.

I have no idea what's going on, or how to even find what settings to tweak, turn on/off etc. Any guidance would be wonderful.

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This appears to be due to a several things:

  • Transparent is enabled in Render settings > Film. This renders the image with alpha transparency instead of sky. Useful for compositing, but hides the sky texture (at least in viewport render).

  • Ray visibilities are disabled on the world material.

  • The compositing setup doesn't take into account the sky texture. This is understandable, as a real-life camera would over-expose the sky when taking a picture with a reasonably exposed interior.

So to make this work, you'll need to modify the compositing setup.


Start by adding your sky texture to the world material. Ensure the strength is set correctly and at least Camera ray visibility is enabled:

enter image description here

Disabling Properties > Render > Film > Transparent won't work in this particular case, since the compositing setup uses it create glare from the sky. Instead you can use the Environment pass:

  1. Enable the environment pass in Properties > Renderlayers > Passes:

    enter image description here

  2. Connect the environment pass output of the _mainScene Render layers node to the Alpha over node in the COLOR CORRECTION frame:

    enter image description here

  3. You may have to reduce the amount of glare by reducing the Fac value of this mix node:

    enter image description here

Render:

enter image description here

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