Need help with lighting trees. [Solved]

JackTickle

Ok so I'm getting a strange problem where if I bring in a tree I made it looks fine.. until I build lighting. Once I build lighting the whole thing goes daft on me and looks terrible.
Left: Unbuilt lighting.
Right: Built Lighting.

https://gyazo.com/0b4c6351111984bda78a697e7ef45b8f

I would like trees to have the leaves like on the left while having the shadows like on the right.

Obscura

Use two sided foliage shading model on the foliage material.
https://wiki.unrealengine.com/Two-Sided_Foliage_Material

Maybe you also have some issues with your lightmap uvs. I can clearly see some

JackTickle

Obscura said:

Use two sided foliage shading model on the foliage material.
https://wiki.unrealengine.com/Two-Sided_Foliage_Material

Maybe you also have some issues with your lightmap uvs. I can clearly see some

Thanks Obscura, I was thinking that the lightmaps could be an issue too but I'm not sure how I could fix it in the best way, any ideas? How would you do the light maps for such an asset?

Obscura

Well. As a first try you could simply pack your uvs, so there is no overlapping. But... If you have any unwrap, Unreal should be able to re-pack that and use it for lightmapping. Its a checkbox on the import dialogue. I think its called generate lightmap uvs.

Simply non overlapping lightmaps should give you decent lighting in the most of cases.

JackTickle

Obscura said:

Well. As a first try you could simply pack your uvs, so there is no overlapping. But... If you have any unwrap, Unreal should be able to re-pack that and use it for lightmapping. Its a checkbox on the import dialogue. I think its called generate lightmap uvs.

Simply non overlapping lightmaps should give you decent lighting in the most of cases.

Yeah my lightmaps were exactly that.. strange that it wouldn't work while lighting was built. It's ok though cause I worked out a simple fix even if only temporary. I just switched the mesh to be either stationary or movable.

Obscura

What's the lightmap resolution of this object? And how does it look like in the lightmap density view, after baking?

JackTickle

Obscura said:

What's the lightmap resolution of this object? And how does it look like in the lightmap density view, after baking?

I will check tomorrow and report back.