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So in unity I have some weird squares on surfaces of certain objects, which are buildings represented by planes: enter image description here

I don't know what causes it, I tried changing some settings in lighting and material, but couldn't fix it. This only occurs with one object which is a few planes representing buildings temporarily. The lighting is baked (one directional light). Here's the screenshots of lighting and materials tab: enter image description here enter image description here

Does anyone know what could be the problem and how I can fix it? Ask for more information if needed. Thanks.

EDIT: The buildings were imported from blender.

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  • \$\begingroup\$ There is also another planes behind those visible in picture to stop the light passing as planes are single sided. So every single plane has a duplicate turned 180 degrees \$\endgroup\$ Commented Feb 7, 2016 at 12:01
  • \$\begingroup\$ Don't do that. Set the rendering mode of the Mesh Renderer on each plane to Two Sided and remove the duplicates. \$\endgroup\$ Commented Feb 7, 2016 at 17:41
  • \$\begingroup\$ I don't see where I can do so. I could write a shader to render both sides but then the light will still be penetrating the planes so there will be no shadows. \$\endgroup\$ Commented Feb 7, 2016 at 18:07
  • \$\begingroup\$ my mistake, set the Cast Shadows variable on each Plane's Mesh Renderer to Two Sided. \$\endgroup\$ Commented Feb 7, 2016 at 18:10
  • \$\begingroup\$ Ok so I set it to Two Sided but at the end of baking the squares still appear. Do you know if I need to tweak something in the lightmap? Because when I set my directional light from baked to realtime everything looks good without any weird shapes. Currently it's set to Baked. \$\endgroup\$ Commented Feb 7, 2016 at 18:32

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Reset to default
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I solved the problem! It can easily be fixed by setting generate lightmap UV to true in the import settings of the model.

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  • \$\begingroup\$ John! Your suggestion worked for me! Thank you for asking, and answering, this question almost 7 years ago. Your words are still valid today. (^_^) \$\endgroup\$ Commented Mar 3, 2023 at 6:35

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