Any clue about what's happening ? I tried to compute the lightmaps in both sapien and Tool.
They looked good until I used the radisoity_save command...

Could be the shader. Try going into guerilla and chacking the box in the shader tag that says "simple paramiterization" and save. Recompile lightmaps and see if it fixed it. That's my best guess.

Thats exactly what I didnt want to do because the shader in question is repeated multiple times on the ground...

And simple paramiterization breaks that? oh, didn't know that :/ Hmmmmm. Idk what to tell you then, dude...Sorry.

Sometimes simply toggling that flag will fix it.

Did you run a full radiosity?

If you didn't this may be your problem.
I didn't run a full radiosity on a map mod and I had this happen. I ran it again all the way and the problem went away.

Well, you may want to change that to a standard ground shader with detail maps. Not hard, just a simple UV edit it looks like on your end. It's never good to have repeating textures for your terrain.

what do you mean by "full" ? I said I tried to run it in total quality in sapien and in tool, until the counter of things reaches 0 0 0...



in fact it's a repetition of "ground shaders with detail maps", I'd bake the old terrain on a newly unrapped ground, but the problem is that I lost the source.

I reverted back to the half symmetrical lightmap, it's not so important. I think the error happens because it's on the same smoothing groups, and experience tells me radiosity bitmaps are separated by smoothing groups or something like this.

Any changes? I get plenty of these weird skid marks all over my mesh. Highest I've gone with lightmaps is 1 0.4, though. I'm inclined to agree with your hypothesis; that is, that smoothing groups are the problem here.