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Item A Modular Authoring Tool for Atmospheric Cloud Modelling(The Eurographics Association, 2022) Rodríguez-Hernández, Darío; García-Fernández, Ignacio; Posada, Jorge; Serrano, AnaModelling of atmospheric effects and, in particular, of clouds is a recurrent topic in computer graphics. Achieving realistic results poses a great challenge, and manual modelling of such complex structures is unfeasible in production. The use of procedural techniques, either through simulation or heuristic methods, is, thus, frequent. In this work we propose a model that allows atmospheric cloud modelling with small computational effort and a good degree of control by the modeller, speeding up the artistic process. The model is designed hierarchically, can be extended easily due to its modular structure and it allows an intuitive control through a graphical user interface. The tests show a variety of effects that can be generated, and the influence of the different parameters on the render time of the final scene.Item Modelling and Animation of Stalactite Growth for Virtual Caves(The Eurographics Association, 2024) Amorós-Tur, Horacio; García-Fernández, Ignacio; Marco, Julio; Patow, Gustavo; Amorós-Tur, Horacio|; García-Fernández, Ignacio|https://orcid.org/0000-0001-6901-0790Producing large-scale scenarios in video games, animation, and the VFX industry is inherently complex and time-consuming. As a consequence, procedural modelling of landscapes, either natural or generated by human activity, is a recurring topic in computer graphics. In this paper we propose a model for the growth of stalactites that is based on physical-chemical models. The model, which is presented here for 2D landscapes, is able to generate animations of the evolution of these speleothems along time. The resulting formations are consistent with the theoretical models and with observed speleothems, and provide realistic stalactite appearance in a cave ceiling.