Browsing by Author "Usta, Baran"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    A Practical and Efficient Approach for Correct Z-Pass Stencil Shadow Volumes
    (The Eurographics Association, 2019) Usta, Baran; Scandolo, Leonardo; Billeter, Markus; Marroquim, Ricardo; Eisemann, Elmar; Steinberger, Markus and Foley, Tim
    Shadow volumes are a popular technique to compute pixel-accurate hard shadows in 3D scenes. Many variants exist that trade off accuracy and efficiency. In this work, we present an artifact-free, efficient, and easy-to-implement stencil shadow volume method. We compare our method to established stencil shadow volume techniques and show that it outperforms the alternatives.
  • Thumbnail Image
    Item
    Targeting Shape and Material in Lighting Design
    (The Eurographics Association and John Wiley & Sons Ltd., 2022) Usta, Baran; Pont, Sylvia; Eisemann, Elmar; Umetani, Nobuyuki; Wojtan, Chris; Vouga, Etienne
    Product lighting design is a laborious and time-consuming task. With product illustrations being increasingly rendered, the lighting challenge transferred to the virtual realm. Our approach targets lighting design in the context of a scene with fixed objects, materials, and camera parameters, illuminated by environmental lighting. Our solution offers control over the depiction of material characteristics and shape details by optimizing the illuminating environment-map. To that end, we introduce a metric that assesses the shape and material cues in terms of the designed appearance. We formalize the process and support steering the outcome using additional design constraints. We illustrate our solution with several challenging examples.