VUE, the industry-standar outside-environment creation tool have also an non-commercial version: http://www.e-onsoftware.com/try/vue_2014_ple/
You have to create an account on their site to get it.
Support:
OS: Windows XP/Vista/Windows 7/Windows 8 32/64 or Mac OS X v10.5+ 32/64
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Fully functional and no time-limit with saving.
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Render in FullHD (for stills) and animations up to 720p
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3Ds Max, Maya, Softimage, LightWave and Cinema 4D compitable workflow
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Unreal Engine importing tutorial: https://www.youtube.com/watch?v=kh9KalaOttQ&index=1&list=PL2vDfGQtRpTVHtY3NO_XquzGk2Ncazm5_