Editing L-system (section)

=== Manual and Semi-Automated Tools ===
Early tools for L-system inference were often designed to assist experts rather than replace them. For example, systems that presented a population of potential L-systems to the user, allowing them to select aesthetically pleasing or plausible options, reduced some of the manual burden.<ref name=":3" /><ref name=":4">Fabricio Anastacio, Przemyslaw Prusinkiewicz, and Mario Costa Sousa. Sketch-based parameterization of L-systems using illustration-inspired construction lines and depth modulation. Computers & Graphics, 33(4):440451, 2009.</ref> However, these tools relied heavily on human judgment and did not fully automate the inference process.