simple, make a plane the size of your roof. Bake normals,textures, ao from high poly to low poly. use in unity or udk. by the way, 486 is still too much for a roof piece. you can get away with (curves included) with just 40 to 50 faces max (with lot of details)
Here is one I made a while ago. Mine has 67 faces, which is considered pretty low poly for most games. I don’t think it has to be a flat plane, unless you’ll hardly see it. Mine was designed as a prop that may lean up against a wall, as in Half Life 2 etc.
But yes, agreed, you can certainly just use a plane with baked normals and textures.
Hey so i thought id try a different model juust to get the flow right, so i went with a tin can.
here are the two models, and here is the normal map it gave me?? im confused as to how to bake a decent normal map for this model. what parameters would give me theis result?
also i tried it in object space, and it ended up giving the highpoly model a normal map, so i roughly matched the uvs and got this result, still far from perfect but everything is working, just need to bake the high poly normals onto the low ones UV’s