Campus Event Calendar
Event Entry
What and Who
User-Guided Scene Stylization using Efficient Rendering Techniques
Oliver Klehm
MMCI
Promotionskolloquium
AG 1, AG 2, AG 3, AG 4, AG 5, SWS, RG1, MMCI
Public Audience
English
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Date, Time and Location
Friday, 12 February 2016
16:00
60 Minutes
E1 4
019
Saarbrücken
Abstract
In this dissertation, we propose new techniques to display and manipulate virtual worlds to support visual
design.The real-time constraint of applications such as games limits the accuracy at which rendering
algorithms can simulate light transport. Our first method focuses on the efficient rendering of surfaces under
natural illumination, extending previous work that ignores directional-dependent effects in the lighting.
In a second work, we present an approach for the efficient computation of scattering in homogeneous
participating media. The main challenge is the accumulation of visibility along view rays, which we solve using
an efficient filtering scheme.
In the second part of the dissertation, we investigate methods that provide artists with approaches to stylize
and manipulate the appearance of volumetric scattering. First, we focus on the effect of light shafts that one
can typically observe on hazy days due to openings in the clouds. While the effect is often used in games and
movies, it is difficult to manipulate. We propose tools to directly manipulate parameters of the rendering,
effectively providing control over the creation, shape, and color of these light shafts. In another work, we
abstract from direct parameter changes and propose a goal-based design approach to manipulate the appearance
of heterogeneous media such as clouds. We use inverse rendering to infer volume parameters from user paintings
to achieve a desired look. The problem is expressed as an optimization procedure for which we show an efficient
execution on the GPU. We show in several examples that these novel methods enable intuitive, expressive, and
effective control over the stylization of volumetric scattering.
design.The real-time constraint of applications such as games limits the accuracy at which rendering
algorithms can simulate light transport. Our first method focuses on the efficient rendering of surfaces under
natural illumination, extending previous work that ignores directional-dependent effects in the lighting.
In a second work, we present an approach for the efficient computation of scattering in homogeneous
participating media. The main challenge is the accumulation of visibility along view rays, which we solve using
an efficient filtering scheme.
In the second part of the dissertation, we investigate methods that provide artists with approaches to stylize
and manipulate the appearance of volumetric scattering. First, we focus on the effect of light shafts that one
can typically observe on hazy days due to openings in the clouds. While the effect is often used in games and
movies, it is difficult to manipulate. We propose tools to directly manipulate parameters of the rendering,
effectively providing control over the creation, shape, and color of these light shafts. In another work, we
abstract from direct parameter changes and propose a goal-based design approach to manipulate the appearance
of heterogeneous media such as clouds. We use inverse rendering to infer volume parameters from user paintings
to achieve a desired look. The problem is expressed as an optimization procedure for which we show an efficient
execution on the GPU. We show in several examples that these novel methods enable intuitive, expressive, and
effective control over the stylization of volumetric scattering.
Contact
Ellen Fries
9325-4003
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Ellen Fries, 02/02/2016 11:36 -- Created document.