How do you recommend doing "decals" on landscapes? For example, if a bomb hits the landscape, I want that spot to be black and burned. I can set an individual vertex to a black texture (well, with a few hacks to Soya), but that's not very good when your scale is 1 Soya Unit = 1 meter. Here's what I'm looking for: http://novalis.org/images/mockup/burned.jpg
I think the best way to do this is to composite your decal with the current texture at that vertex and set the new texture to the composited texture.
Also, it's clear that landscapes are weak when dealing with cliff faces. Should I (a) reduce my scale and use much bigger maps (which, I assume, will have performance costs) or (b) put some sort of structure "on top" of my landscape to represent cliffs?
You can probably get away with using much bigger maps than you're currently using without too much of a problem. I think one unit per meter is fairly coarse. I think the LOD algorithm will handle this efficiently, though you may have to play with some of the parameters.
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