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With the new (as of March 2011) landscape tool, the Unreal Development Kit supports bigger and (potentially) streaming landscapes than the old terrain tool. However, in my tests trying to import or create from scratch a small island (specifically, the island of Tenerife including some of the surrounding sea at 2m horizontal resolution, resulting in a roughly 35.000x20.000 pixel heightmap image - downright tiny in comparison to your usual GIS raster datasets), the UDK simply crashes. No error message or anything like that, simple program crash.

It seems as if I run against some kind of internal limit there, but without any clue as to where it happens and with the tool being rather new and undocumented, it's hard to say where those limits are.

Thus the question - what's the maximum size of a heightmap which can be used with the landscape tool in UDK, both in terms of the "amount of heightmap points" and the "width and height in Unreal Units"? In addition, if there are special tricks possible to break those limits (Streaming in the landscape? Portals?), some pointers would be nice ...

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From the page you linked :)

Because of its powerful LOD system and the way it makes efficient use of memory, heightmaps up to 8192x8192 are now legitimately possible and feasible.

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