Black material problem

[theFaceless]

Hi everyone!
I'm working for my first landscape project, but i have some problems and obviously i ask you to help me. :>

Here's the thing:
I finished making landscape succesfully, but when i've tried to add some trees (created in SpeedTree and converted to StaticMesh, to use them with Foliage Mode) and build the lighting, material becomes to black and displays incorrectly.


There is material's settings (same as standart udk trees material):




So help me please. Thank you in advance.

[JessieG]

Converting speed trees to a static mesh doesn't give you proper lightmap UVs, which is probably why the lighting turns black. Unless you can generate lightmap UVs for a speed tree in the content browser after double clicking on them (which I doubt is possible) you most likely have to export a tree from your scene and then create a lightmap UV channel for it in a 3D app and reimport that into UDK as a regular static mesh.

[theFaceless]

Thank you for your reply. I've created a new UVs channel in 3ds max. Now, tree displays correctly, but after lightmass build udk shows me error "Overlapping UVs".

Is this is critical and how can i deal with it?

[Tearl]

You need unique UV coords for each triangle (flatten mapping). The lightmap will not bake correctly with overlapping UV's Problem is, your tree has a lot of triangles, and getting a good lightmap res will be very hard to achieve.

[theFaceless]

Well, that means that i need to rearrange UVs coords even for the main diffuse channel?

[redbox]

lotry to create 2nd UV channel in static mesh editor, in Mesh->Generate Unique UV

[JessieG]

No, the diffuse channel can have UVs arranged any way that you want, the lightmap channel can't have any overlapping uvs (so each leaf plane needs its own space in the lightmap UVs as well as the trunk) and they have to be in the 0-1 space.

Since each piece is so small you'd also benefit from bumping the lightmap res up in the static mesh editor.

[theFaceless]

Thank you for your tips!
But is there is another way to place speedtrees fast except manual placing?