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I want to know how an emission light works. I have a small room, A window and a sphere as light. I want the light from inside to pass through the transparent glass window and the light from the outside to also pass through the same window. I have set the strength to 100 yet the light is not passing out of the room.

If I were to make another object other than a glass window (Like a wall lantern for example), are the settings for the material the same or do I have to change them? If they are different how do I set the settings for both?

blender file

getting errorenter image description here

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atek
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  • Umm maybe i missed something but from what i see your wall behind the window doesn't have a hole - so sure there can pass no light through it. If you cut a hole in the walls with a boolean modifier, it works fine. Edit:I think you used archimesh and thats why the .blend does not work right for me. but still- when i cut a hole in the wall it works fine. – Simon S. Nov 07 '16 at 15:25
  • but the window having the glass material so light can pass from it why it need a hole. – atek Nov 07 '16 at 15:34
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    Please watch: https://www.youtube.com/watch?v=Heg89K3ZMDo – Pythogen Nov 08 '16 at 04:13

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So the simple solution i case your .blend works the same as mine: add an solidify modifier and an boolean modifier (set to difference) that uses the object CTRL_Hole to both walls that are in the scene ("Room" and "Wall_cover"). Then it works fine. enter image description here

edit- Answer to your previous question under my comment: The window doesn't need a hole it's the walls behind it (diffuse material) that need it for the light to pass through.

Simon S.
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  • Thanks for that answer if i have a paper lantern will that works as i want that paper lantern light to be pass from the paper there is no hole to the lantern how it will work then. – atek Nov 07 '16 at 16:13
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    use a translucent shader for the paper. It makes the light pass from one side to the other side of an object (like paper). – Simon S. Nov 07 '16 at 16:18
  • as soon as i click on apply its give an error an image add above. – atek Nov 07 '16 at 16:28
  • Sorry i don't get what you mean maybe you should watch some tutorials about cycles in general - Andrew Price and CynicatPro on YouTube for example do nice tutorials. – Simon S. Nov 07 '16 at 19:47
  • I have applied the boolean tool as u said but its not working its giving error i have attach .gif file with whats error im getting – atek Nov 08 '16 at 02:33
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It is very simple, a diffuse material that you have for the wall doesn't actually allow light to pass through it. You need to make it transparent a simple transparent or glass shader doesn't work. Make a material like this here is the glassy material

  • thanks for ur reply. sorry im weak in nodes as said above. If i want to add the paper or plastic other than glass can i remove only the glass shader. will transparent will be same – atek Nov 08 '16 at 02:46