The file r3line.dll is a part of a plugin for Realsoft 3D created by Realsoft Oy. This is a part of a post effect plugin. Realsoft 3D is a graphics program that uses raytracing and modeling to create photorealistic images. It was created by the Finnish company Realsoft Oy, and is available in a free trial version that you may have downloaded onto your computer even if you have not purchased this product.
If you are getting an error with the r3line dynamic link library, the plugin that relies on this file will not run correctly and Realsoft 3D may not work as expected. You may need to clean your registry to fix this issue. The registry is a database that tracks all the programs and files installed on your computer. When you get a dll file error, it usually means that there is a problem in the registry that means that Windows cannot find the file.
ZookaWare PC Cleaner can fix those problems for you. ZookaWare PC Cleaner hunts down mistakes in the registry and cleans them up. Try a free ZookaWare PC Cleaner scan to see if your registry needs to be cleaned.