Surface problem

Unity Engine
1

Hello,

i’m trying to create a scene in Unity. Everything is fine, but i keep getting a very annoying issue. I have a very basic door model in Blender, the normals and UVs are fine (checked 100 times on different parts of the object). However, when i import the model into Unity it looks very weird - i can see through polygons.

Model in Blender:

1303924--60785--$blender_solid.png
1303924--60785--$blender_solid.png1024×511 5.48 KB

1303924--60786--$blender.png
1303924--60786--$blender.png1024×511 267 KB

Model in Unity (fbx):

1303924--60787--$unity_no_lm.png
1303924--60787--$unity_no_lm.png1024×511 210 KB

Unity material setup:

1303924--60788--$material.png
1303924--60788--$material.png1024×511 111 KB

Simple texture with alpha (targa 32-bit):

1303924--60789--$door_texture.png
1303924--60789--$door_texture.png1024×511 30.6 KB

Is there any way to fix it or do i do something wrong?

Thank you!

Best regards,
Alex

2

Go to edit mode in Blender, select all vertices and Recalculate the normals outside.

3

As i said earlier, that doesn’t help. I’ve done it many times. The screenshots above show the normals, which are fine, i’ve checked them one by one.

4

Quick update on the problem.

When i change the transparent material to non-transparent one, everything looks fine (both lightmapped and not lightmapped):

1303979--60793--$unity_diffuse_lm.png
1303979--60793--$unity_diffuse_lm.png1024×514 329 KB

1303979--60795--$unity_diffuse_nolm.png
1303979--60795--$unity_diffuse_nolm.png1024×514 341 KB

5

It was very hard to see how your model is supposed to look in Unity. It is usually better if you spit transparent and opaque parts and use separate meshes/materials/textures for them. You also avoid transparency depth issues.

6

Thanks for the suggestion Dantus! Well, using multiple materials on one mesh is what i always trying to avoid, yet i don’t think that splitting simple mesh into multiple objects is a good idea. There are a lot of doors and windows in the scene and all those small objects will create a mess, which is what i would like to avoid as well.
I’ll try to go with multiple materials and will share the results.

7

The problem is now fixed by assigning separate materials to the respective parts of the mesh. It is good as a temporary workaround, but is there any less CPU expensive workaround?