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              <p>Large-scale terrains are essential in the definition of virtual worlds. Given the diversity of landforms and the geomorphological complexity, there is a need for authoring techniques offering hydrological consistency without sacrificing user control. In this paper, we bridge the gap between large-scale erosion simulation and authoring into an efficient framework. We set aside modeling in the elevation domain in favour of the uplift domain, and compute emerging reliefs by simulating the stream power erosion. Our simulation relies on a fast yet accurate approximation of drainage area and flow routing to compute the erosion interactively, which allows for incremental authoring. Our model provides landscape artists with tools for shaping mountain ranges and valleys, such as copy-and-paste operations; warping for imitating folds and faults; point and curve elevation constraints to precisely sculpt ridges or carve river networks. It also lends itself to inverse procedural modeling by reconstructing the uplift from an input digital elevation model and allows hydrologically consistent blending between terrain patches.</p>
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              <p>Les terrains à grande échelle prennent une place importante dans le processus de création de mondes virtuels. La diversité et la complexité des reliefs entraînent un besoin d'outils d'édition performants, qui respectent les contraintes naturelles tout en garantissant le contrôle de l'utilisateur. Dans ce papier, nous rassemblons les avantages de la simulation d'érosion à grande échelle avec ceux de l'édition de relief interactive. Plutôt que de construire directement l'élévation du terrain, nous travaillons dans le domaine de l'uplift (taux de surrection tectonique), avant d'obtenir les véritables reliefs grâce à une simulation d'érosion fluviale. Notre modèle repose sur une approximation efficace du réseau de drainage, qui permet une érosion suffisamment performante pour être interactive. Cette méthode fournit aux artistes des outils pour former des chaînes de montagnes et des vallées : des opérateurs de fusion, de copier/coller et de déformation, ainsi que des contraintes d'élévation sur des points ou des courbes. Ce modèle se prête également à de la modélisation procédurale inverse, permettant de reconstruire une carte d'uplift à partir d'un terrain existant.</p>
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