Interactive on-surface signal deformation

We present an interactive system for the artistic control of visual phenomena visible on surfaces. Our method allows the user to intuitively reposition shadows, caustics, and indirect illumination using a simple click-and-drag user interface working directly on surfaces. In contrast to previous approaches, the positions of the lights or objects in the scene remain unchanged, enabling localized edits of individual shading components. Our method facilitates the editing by computing a mapping from one surface location to another. Based on this mapping, we can not only edit shadows, caustics, and indirect illumination but also other surface properties, such as color or texture, in a unified way. This is achieved using an intuitive userinterface that allows the user to specify position constraints with drag-and-drop or sketching operations directly on the surface. Our approach requires no explicit surface parametrization and handles scenes with arbitrary topology. We demonstrate the appli...

• Type: Conference
• Year: 2010
• Where: SIGGRAPH
• Authors: Tobias Ritschel, Thorsten Thormählen, Carsten Dachsbacher, Jan Kautz, Hans-Peter Seidel
• Keywords: Computer Graphics, Enabling Localized Edits, Indirect Illumination, SIGGRAPH 2010, Simple Click-and-drag User