In QGIS, I have a layer of numerous vector lines that need to be buffered. Once they've been buffered, I'd like to have those polygons split into two, with the original line being the segment that splits them. This also needs to be done with a vector layer that has roughly 10,000 lines in it, so I won't be able to complete this line by line.
The first picture simply shows what the layer of lines looks like. The second picture shows how I'd like to be able to identify specific parts of the buffers after they've been buffered.