[jasonjmcghee]

There are multiple ways to solve this issue. The most naive would be rendering to a larger texture and cropping, but with radiance cascades you can do better- you could only render what's necessary based on per-cascade interval lengths. Depending on needed accuracy, you could calculate it similar to ambient light, only calculating it for the largest cascade- wouldn't be perfect, but could feel pretty natural.

Definitely an area that could use more research!