TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Schneegans, Simon
A1  - Gilg, J.
A1  - Ahlers, Volker
A1  - Gerndt, Andreas
T1  - Real-Time Rendering of Eclipses without Incorporation of Atmospheric Effects
JF  - Computer Graphics Forum
N2  - In this paper, we present a novel approach for real-time rendering of soft eclipse shadows cast by spherical, atmosphereless bodies. While this problem may seem simple at first, it is complicated by several factors. First, the extreme scale differences and huge mutual distances of the involved celestial bodies cause rendering artifacts in practice. Second, the surface of the Sun does not emit light evenly in all directions (an effect which is known as limb darkening). This makes it impossible to model the Sun as a uniform spherical light source. Finally, our intended applications include real-time rendering of solar eclipses in virtual reality, which require very high frame rates. As a solution to these problems, we precompute the amount of shadowing into an eclipse shadow map, which is parametrized so that it is independent of the position and size of the occluder. Hence, a single shadow map can be used for all spherical occluders in the Solar System. We assess the errors introduced by various simplifications and compare multiple approaches in terms of performance and precision. Last but not least, we compare our approaches to the state-of-the-art and to reference images. The implementation has been published under the MIT license.
KW  - Echtzeitsimulation
KW  - Rendering
KW  - Virtuelle Realität
KW  - Sonnenfinsternis
KW  - Real-time simulation
KW  - Maps
KW  - Rendering (computer graphics)
KW  - Spheres
KW  - Virtual reality
Y1  - 2023
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:960-opus4-25566
SN  - 0167-7055
SS  - 0167-7055
U6  - https://doi.org/10.25968/opus-2556
DO  - https://doi.org/10.25968/opus-2556
VL  - 41
IS  - 7
SP  - 279
EP  - 289
ER  -