Generalized Image Acquisition and Analysis

Interactive Volume Caustics in Single-Scattering Media

Volume caustics are intricate illumination patterns formed by light first interacting with a specular surface and subsequently being scattered inside a participating medium. Although this phenomenon can be simulated by existing techniques, image synthesis is usually non-trivial and time-consuming. Motivated by interactive applications, we propose a novel volume caustics rendering method for single-scattering participating media. Our method is based on the observation that line rendering of illumination rays into the screen buffer establishes a direct light path between the viewer and the light source. This connection is introduced via a single scattering event for every pixel affected by the line primitive. Since the GPU is a parallel processor, the radiance contributions of these light paths to each of the pixels can be computed and accumulated independently. The implementation of our method is straightforward and we show that it can be seamlessly integrated with existing methods for rendering participating media. We achieve high-quality results at real-time frame rates for large and dynamic scenes containing homogeneous participating media. For inhomogeneous media, our method achieves interactive performance that is close to real-time. Our method is based on a simplified physical model and can thus be used for generating physically plausible previews of expensive lighting simulations quickly.

Teaching

winter term 2014/15

Lectures

winter term 2013/14

Advanced Display Technology
Ivo Ihrke, Pascal Picart

winter term 2012/13

Seminars

Parallel Visual Computing
Ivo Ihrke, Tobias Ritschel, Mario Fritz

summer term 2012

Lectures

Computational Photography
Ivo Ihrke
Universität des Saarlandes


winter term 2011/12

Seminars

summer term 2011

Lectures

Computational Photography
Ivo Ihrke
Universität des Saarlandes / JKU Linz
Hispos

winter term 2010/11

Seminars

Research Topics in Computational Photography (project-based seminar)
Ivo Ihrke

summer term 2010

Lectures

Computational Photography
Ivo Ihrke, Matthias Hullin
Universität des Saarlandes

winter term 2009/10

Seminars

Computational Photography and Videography
Ivo Ihrke, Christian Theobalt