Having Texture problem in UE4

[Suryansh]

Issue:- Right now I am working on EsaceBuilding Section and I am having an issue with some of the walls in my level’s room that these walls are not reflecting any light (Showing pitch-black colour).

Screenshot of Walls:-

I correctly applied texture to the walls.

Note:- As I move lights inside my room all the walls start reflecting light and start showing its textures correctly but when I build lighting the same issue starts occurring.

I also tried making a new level and again did everything but the same issue keeps coming

[DanM]

What does the UV channel look like for the one you are using?

[Suryansh]

I checked Light Map Coordinate Index and it was set to 0 and then I changed it to 1 and now my problem is almost gone, thanks to you. But I am still having a problem:-

As you can see that a large shadow is coming on the wall.

These are my setting of lightmap for this wall:-

[DanM]

I meant for you to click UV 0 or 1 and take a look at them. Often 0 doesn’t make sense for the object. The lightmap coordinate index is referring to those UV channels.

So I was suggesting that you should take a look at both and set the lightmap coordinate index to the one that looked more correct.

As for the shadow is there anything in the way there, even something that is “invisible”?

[Suryansh]

As you can see I try changing UV channels but still have almost the same problem.
I looked over my project again I didn’t find any hidden or visible mesh outside the room.

[DanM]

In that case would you mind sending me your project using the following link?

https://gdev.tv/projectupload

Please use File > Package Project > Zip Up Project within Unreal as this will ensure only required files are zipped up and things like the Binaries are excluded.

[Suryansh]

I sent you my project and suggested you in the form.
I submitted my name as Suryansh.

[DanM]

Oh, it just had a super low lightmap resolution of 4. Default of meshes you import is 64, sometimes that’s not great either so I suggest you try various values of 64 - 1024.

[Suryansh]

Well, those shadow problems are gone after changing overridden Lightmap resolution to 64 but now I am having A new problem as you can see below:-

Note:- I also tried changing overridden Lightmap resolution to 128 but still having this same problem.

[DanM]

Did you change the coordinate as well?

[Suryansh]

Yes, I forgot to change the LightMap Coordinates and after setting this to 1 All the issues are resolved, Thanks To You.
I have one more question, will we be introduced to LightMap Coordinates Later on in the course?

[DanM]

As I said before, that just refers to which UV channel to use (and if you look at each 0 is just empty). UV’s are very lightly touched on in the texture tiling lecture IIRC.

This topic would be the subject of one of the Blender courses.

(I haven’t actually done them so maybe @Marc_Carlyon could confirm?)

[Suryansh]

Oh, okay, and thanks a lot again.