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Item Tonal Art Maps with Image Space Strokes(The Eurographics Association, 2016) Szécsi, László; Szirányi, Marcell; Kacsó, Ágota; Giovanni Pintore and Filippo StancoThis paper presents a hybrid hatching solution that uses robust and fast texture space hatching to gather stroke fragments, but fits stylized brush strokes over those fragments in image space. Thus we obtain a real-time solution that avoids the challenges associated with hidden stroke removal in image space approaches, but allows for the artistic stylization of strokes exceeding the limitations of texture space methods. This includes strokes running over outlines or behind occluders, uniquely random strokes, and adherence to image space brush properties.Item Kernel-Reflection Sequences(The Eurographics Association, 2016) Szécsi, László; Bendefy, Zoltán; Kacsó, Ágota; Giovanni Pintore and Filippo StancoComplex geometries, like those of plants, rocks, terrain, or even clouds are challenging to model in a way that allows for real-time rendering but does not make concessions in terms of visible detail. In this paper we propose a procedural modeling approach, called KRS, or kernel-reflection sequences, inspired by iterated function systems. The model is composed of kernel geometries defined by signed distance functions, and reflection transformations that multiply them. We show that a global distance function can be evaluated over this structure without recursion, allowing for the implementation of real-time sphere tracing on parallel hardware. We also show how the algorithm readily delivers continuous level-of-detail and minification filtering. We propose several techniques to enhance modeling freedom and avoid conspicuous symmetries. Most importantly, we extend sphere tracing to conformally transformed geometries. We also propose a GPU load balancing scheme for best utilization of computing power. To prove that the model can be used to realize various natural phenomena in uncompromising detail and extents, without obvious clues of symmetry, we render aquatic and terrestrial surface formations and vegetation in real-time.