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How should I make my buildings?

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How should I make my buildings in Unity? Separated meshes for the walls, or everything single mesh as possible?



My idea is create a simple project, inspired on those F2P FPS that runs on any PC:



The thing is, i don't know the best way to make the buildings for the maps, if I separate each side of the room, the occlusion culling can disable them, I can use them as modular walls, like modern games do, but that way increases the draw call count and etc...

The other way, wich makes more sense to me, is make the walls as a single mesh, if the mesh use the same material (with repeat textures), this way i have less draw calls, but some dev on facebook told me to separate everything.

My target is something above 128 MB  of VRAM with Intel Graphics, my test bench have an 10 year old CPU, i wish to know the best way to use those limited resources like some games do, any tips?

*Tell me where should I post this thread, if I posted on the wrong category, I'm new at Polycount.

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