Loss of a cytoplasmic determinant through formation of protoplasts in Podospora

Loss of cytoplasmic determinant through formation of protoplasts in Podospor

Long term storage of Podospora anserina

Until now, maintenance of Podospora anserina strains was tedious, requiring yearly sexual crosses, spore isolation and germination, verification of the genotype and transfer of mycelium to stock tubes maintained at 4 C. We have circumvented these difficulties by storage of ascospores at -80 C

Distributing Monte Carlo Errors as a Blue Noise in Screen Space by Permuting Pixel Seeds Between Frames

International audienceRecent work has shown that distributing Monte Carlo errors as a blue noise in screen space improves the perceptual quality of rendered images. However, obtaining such distributions remains an open problem with high sample counts and high-dimensional rendering integrals. In this paper, we introduce a temporal algorithm that aims at overcoming these limitations. Our algorithm is applicable whenever multiple frames are rendered, typically for animated sequences or interactive applications. Our algorithm locally permutes the pixel sequences (represented by their seeds) to improve the error distribution across frames. Our approach works regardless of the sample count or the dimensionality and significantly improves the images in low-varying screen-space regions under coherent motion. Furthermore, it adds negligible overhead compared to the rendering times

Real-Time Rendering of Glinty Appearances using Distributed Binomial Laws on Anisotropic Grids

In this work, we render in real-time glittery materials caused by discrete flakes on the surface. To achieve this, one has to count the number of flakes reflecting the light towards the camera within every texel covered by a given pixel footprint. To do so, we derive a counting method for arbitrary footprints that, unlike previous work, outputs the correct statistics. We combine this counting method with an anisotropic parameterization of the texture space that reduces the number of texels falling under a pixel footprint. This allows our method to run with both stable performance and 1.5X to 5X faster than the state-of-the-art.Comment: 9 page

Zum Gedenken an Günter Natho

Am 20.9.2009 starb nach langer Krankheit im 84. Lebensjahr der im Altkreis Wanzleben wohl bekannteste Naturschützer Günter Natho. Für viele seiner Mitstreiter kam sein Tod trotz seines Alters und dem Wissen um seine Krankheit dennoch plötzlich. Umfangreiches Wissen, ein wacher Geist und sein freundliches, bescheidenes Wesen mit einer Portion an hintergründigem Humor ließen ihn zu dem werden, was er für viele Menschen seiner Umgebung war – Sympathieträger und Synonym für den Naturschutz in der Börderegion

Frequency Based Radiance Cache for Rendering Animations

International audienceWe propose a method to render animation sequences with direct distant lighting that only shades a fraction of the total pixels. We leverage frequency-based analyses of light transport to determine shading and image sampling rates across an animation using a samples cache. To do so, we derive frequency bandwidths that account for the complexity of distant lights, visibility, BRDF, and temporal coherence during animation. We finaly apply a cross-bilateral filter when rendering our final images from sparse sets of shading points placed according to our frequency-based oracles (generally < 25% of the pixels, per frame)