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Lightmap...Why u do this?

Ok, i have tried everything i could think of but my meshes still look ugly.

Why is this happening?

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This is the default uvs unreal creates when i import the mesh as my uvs were worse

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asked Oct 25 '14 at 01:02 PM in Rendering

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avatar image TeamKingdom Oct 25 '14 at 01:08 PM

What part of your scene are you having a problem with? I'm assuming it's the top part of the wall that is also the lintel over the door frame? I can't tell where the mesh you show appears in the scene.

avatar image LoN Oct 25 '14 at 01:23 PM

All my walls are these pillars, i just scale them to have desirable size. but the thing is here: alt text

Look at all the uneven light the walls get at the points that they "connect"

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3 answers: sort voted first

Hi LoN,

The issue you're seeing with your mesh and the seam can be worked around. It will require you to set your Lightmaps up properly so that the UVs are aligned on grid spaces for the lightmap resolution you are targeting.

If you take a look at this thread I've covered all the areas you can tweak to reduce the seams on your modular pieces.

If you have any questions feel free to ask! :)


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answered Nov 03 '14 at 06:15 PM

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Tim Hobson ♦♦ STAFF
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Try increasing your lightmap resolution.

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answered Oct 25 '14 at 01:07 PM

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avatar image LoN Oct 25 '14 at 01:24 PM

My lightmap resolution is already at 128. And i need to make a 3 floor building, increasing it more would be overkill.

avatar image Skuvnar Oct 25 '14 at 01:29 PM

Ah, having looked at your 3rd screenshot it seems like you are scaling your meshes too much in one direction. The lightmap is not scaled with the mesh so the long side of the wall is still being give the same number of pixels for a light map as if it were a thin pillar.

If that makes any sense.

avatar image LoN Oct 25 '14 at 01:32 PM

So what should i do? There are a lot of walls that are smaller or bigger than the others...will i have to make all these walls separately by hand in max and import them in unreal? That would take a loooong time.

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avatar image Skuvnar Oct 25 '14 at 01:38 PM

For shipping the project, most likely. But for early stages of development use bsp geometry or just accept you might have poor lighting for a time. If you create some modular meshes (ie. a doorway, a short wall, long wall etc.) it wouldn't take that long as you could still scale them somewhat in one direction.

avatar image LoN Oct 25 '14 at 01:48 PM

I've just added one pillar next to the other instead of scaling them and this is what i get: alt text

It seems for some reason that the walls become that way when there is not enough light from the pointlights.

avatar image Skuvnar Oct 25 '14 at 03:44 PM

This happens when you stick static meshes together like that. Unfortunately there's no real away around it other than creating single meshes for walls, having higher resolution light maps or using BSP. You could also try using setting your lighting build to 'production'.

avatar image LoN Oct 29 '14 at 12:40 PM

Found another way around it....materials with specific details.

avatar image Skuvnar Oct 29 '14 at 12:49 PM

you should mark the question as closed then.

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It seems that i've found the answer to my question, no matter how good lightmaps you can make it will just never be enough. If you make a good material all the problems get solved, for some reason if i add a Roughness And Metalic node, everything gets fixed. Not sure if this is the right answer but for now this will do, check it out: alt text

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answered Oct 26 '14 at 04:29 PM

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avatar image Haflurgaflur Nov 03 '14 at 02:14 AM

The metallic and roughness material nodes are not fixing the problem. They are just hiding it. Lightmass is reading the values and causing light to bounce in your scene making it look nicer. I also recommend making a normal map (even a flat one) as this might actually hide the problem completely.

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