Abstract
Urban space design has been of continued interest for several centuries and procedural modelling is a tool that successfully addresses the challenges in the generation of cities. Procedural production systems are traditionally grammar-based, each one virtually describing a new programming language. Content generators using these tools need not only to have certain artistic sensitivity but also an ability to write computer programs. There have been two recent directions that aim to ease the use of procedural systems. The first one, inverse procedural modelling, includes both systems that generate the production rules from square one and techniques that fit the parameters of existing grammars. The second one can be denoted interactive procedural modelling and introduces tools that leverage the troublesome process of parameter tuning of existing grammars, such as handles and local edits We introduce in this paper the concept of differentiable procedural modelling, which enhances inverse modelling with tools from interactive methods.
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