You are cordially invited to attend the midterm master project presentations on Friday, 16 April starting 14:30. The session will be on Zoom (meeting detail available on request).
The session on 16 April features the two speakers listed below and will take about 1.5 hours.
Speaker: Mika Kuijpers
Speaker: Zehao Jing
Abstract: Diffusion Curve is a vector graphics primitive created by diffusing the given colors of defined Bezier curves. Wang tiles that are squares with colored edges and edge colors of neighbor tiles should be the same are used for tiling the plane. We implement an approach for generating seamless and aperiodic textures based on diffusion curves and Wang Tiles, called the diffusion mosaic
You are cordially invited to attend the midterm master project presentations on Friday, 19 March starting 14:30. The session will be on Zoom (meeting detail available on request).
The session on 19 March features the three speakers listed below and will take about 1.5 hours.
Speaker 1: Wouter Raateland
Title: Interactive Wildfire Simulation in Mesoscale Plant Ecosystems
Abstract: Every year, more and larger wildfires occur. Simulations are used to study and predict the behavior of wildfires. Existing simulations at mesoscale lack detail. This work builds a detailed wildfire simulation at mesoscale on top of an existing ecosystem simulation. We implemented a fast numerical model for wood pyrolysis, and a GPU accelerated fluid simulation on an adaptive grid. This simulation can be used to study the effect of different plant distributions and soil and weather conditions on the behavior of wildfires.
Speaker 2: Pieter Kools
Title: Physics-based model for point-based sail reconstruction
Abstract: The Sailing Innovation Centre has been doing research into developing more optimal sail shapes for their sailing boats. Using models to simulate sail shapes, predictions can be made on what the shape of the sail is expected to be under certain conditions. An important step in this research is to measure how well the real life sail shape matches the expected sail shape from their model. In this thesis we propose a physics-based method to reconstruct a sail configuration from a known (possibly flexible) sail shape and a set of measured points on a real-life sail. We will also investigate the impact of the amount of points measured and their positions on the reconstruction result.
Speaker 3: Max Lopes Cunha
Title: Reduced Projective Skinning for real-time deformable characters
Abstract: Character skinning is the art and science of expressing the vertex displacements when a character takes a particular pose. Projective Skinning is a method capable of producing dynamic tissue motion and resolve (self-)collisions in real-time, which we can speed up further by formulating the physics simulation in a reduced space. In this work, we investigate how these subspaces can be derived from data and how to use them to add real-time skin deformation to humanoid characters.
You are cordially invited to attend the midterm master project presentations on Friday, 19 February starting 14:30. The session will be on Zoom (meeting detail available on request).
The session on 19 February features the three speakers listed below and will take about 1.5 hours.
Speaker 1: Nejc Maček
Title: Real-time relighting of human faces with a low-cost setup
Abstract: Relighting – a process defined as changing the appearance of a subject in an image under novel illumination conditions – often requires specialized equipment to produce believable results. We propose a method to capture an abstract relighting model with a low-cost setup using a smartphone camera. This model is used to perform relighting in real-time on a commodity computer.
Speaker 2: Zhoufan Jia
Title: Fast approximation of the inverse reflector problem
Abstract: Suppose we have a target radiance distribution, a light source and a plane for receiving light. How do we design a reflector that can give a similar result as the target radiance distribution? This is a problem of high interest for light designer and related industry, such as lamp manufactures. The inverse reflector problem can be summarized as a high-dimensional global optimization problem. Some existing algorithms are either not fully compatible with parallel acceleration, or with a too narrow application scope (can only deal with the far-field problem). We proposed a method for generating a fast approximation of the reflector’s inverse design, which can also serve as the initial guess for the a finer optimization.
Speaker 3: Matthias Tavasszy
Title: Real-Time Global Illumination using BRSM and Light Cuts
Abstract: Global illumination is light that bounces through an environment multiple times before it ends up at an observer, which is very computationally expensive to simulate. In order to approximate this effect in real time this work combines two previous works, Bidirectional Reflective Shadow Maps and Light Cuts in order to quickly generate, organize and sample Virtual Light Points for gathering second-bounce illumination at a given location. The program is implemented in Vulkan using RTX ray tracing for occlusion checks.
You are cordially invited to attend the MSc thesis defence of Niels van der Veen. This defense will take place on Friday the 23rd of November, at 12:00h in room LB01.010, building 36.
The presentation is open to the public and will last around 45 minutes including questions from the audience. You are hereby cordially invited to join!
A paint-based approach for optimal lighting design in real scenes
Lighting design is a computational expensive task, commonly done using Computer-aided design (CAD) software in a virtual scene. The designer places and tunes the virtual light sources and, yet the virtual environment is ideal for physically correct light tracing, the costly simulation might not provide the desired impression in the real scene. Moreover, the chosen light placement is not necessarily optimized. In this work we capture light behavior from real scenes as well as 3D scene properties and use this information to recreate different lighting designs. The results approximates physical correctness while visualizing the illumination on the real scene in a more time-efficient way. To make the design process more intuitive, the user paints the desired light properties instead of placing the light sources. The system attempts to find valid positions and parameters of the light sources in the scene to reflect the current design. Constraints such as number of light sources and emission profiles as well as spatial constraints can also be specified.
You are cordially invited to attend the MSc thesis defense of Anshul Khandelwal, titled Reservoir Characterization using a Geometric Approach.
The defense will take place on Monday, 17th September at 14:00h in room Colloquimzaal 0.E420 at Van Mourik Broekmanweg.
The presentation is open to the public and will last around 40 minutes including questions from the audience. You are hereby cordially invited to join!
Reservoir Characterization using a Geometric Approach
Quantifying the anthropogenic impacts such as reservoir characterization is a big challenge in the field of water management. In this work, a computer graphics based geometric approach is presented which can predict the underlying topology of large-scale reservoirs. The proposed algorithm uses freely available, satellite based landscape data of the surrounding regions to predict reservoir characteristics. The premise of the presented approach is that the slope of the surrounding landscape is an important determinant to understand the underlying landscape of the reservoirs. This method outperforms the existing state-of-the-art techniques used to estimate the storage capacities drastically, both in terms of estimated maximum volume stored and estimated volume area curves. Evaluation of the geometric model presented is done on 28 reservoirs using the HydroSHEDs data which was developed using the Shuttle RADAR Topography Mission conducted by NASA. This HydroSHEDs data was obtained in 2000 which acts as ground truth data for the reservoirs built after 2000. Further, model parameters are introduced to improve the modeling capabilities of the reconstructed reservoirs. This approach further intensifies the case of using computer graphics techniques for raster based analysis and provides a platform for further research in the field of water management.
Prof. Dr. Elmar Eisemann
Dr. Klaus Hildebrandt
Dr. Cynthia C.S. Liem
Prof. Dr. Nick van de Giesen
On 15th of March, 2018, Jan-Willem van Velzen successfully defended his master thesis titled “Texture-based Rendering of Vector-based Shapes”. In his work he presents an approach to store vector-based shapes into discrete raster-based textures, optimized for parallel rendering. He also discusses the implementation of both the serialization and deserialization steps, as well as rendering regular vector shapes with a comparable quality.
We congratulate Jan-Williem with his work and defense and wish him all the best for the future!
On the 10th of October, Lennaert van den Brink successfully defended his thesis “HiveArcs – visualizing genome co-expression data“. In his work, he introduced HiveArcs, an interactive online visual analysis for genome co-expression data. HiveArcs visualizes modules using arc diagrams on radially placed axes. Using this lay-out accommodates display of per-gene tracks of additional information as well as relationships between modules. This allows for quick and intuitive comparison between modules as well as in depth analysis of a single module.
We would like to congratulate Lennaert with his work and defense and wish him all the best for the future!
Korijn van Golen and Matthijs Neven successfully defended their theses in our group recently.
On Tuesday, the 8th of July, Korijn defended his thesis “Landmark Influence Visualization in Active Shape Models”. In his work he introduced a novel landmark influence visualization that improves the usability of Active Shape Models. Landmark influence is defined as the change the model fit will undergo if a landmark is removed. The landmark influence is visualized using disk glyphs around landmarks. A region-of-interest filter can be used to inspect influence on local regions. Distance maps and animations visualize how the shape will change.
On Friday, the 22nd of August, Matthijs defended his thesis “Interactive Remote Rendering”. In his work, he present an interactive remote volume-rendering system that tries to bridge the gap between complex medical volume data and the patient. The user can easily upload their own data, which they receive from the clinician after a scan, which they can then visualize. The application does not require any medical or volume visualization background, and can run from any device with a working internet connection and an internet browser.
We’d like to congratulate Korijn and Matthijs with their Master of Science titles!
TU Delta has just posted a nice story on the new games that our undergrad students developed during the Games Project 2014. The article includes a list of YouTube links to their awesome trailers: check them out!
Casper van Leeuwen successfully defended his thesis ‘Spatial-temporal pathline clustering based on FTLE fields‘ in our group on the 14th of May.
In his work, Casper worked with cardiac flow acquisition data consisting of 3D blood flow of the heart featuring 4D vector fields. These 4D vector fields of the heart are used in clinical research to gain insight in the flow patterns within the heart which in turn can be used to gain a better understanding of the pathogenesis of cardiovascular diseases. He implemented a visualization technique called Spatial-temporal Clustering based on Finite Time Lyapunov Exponents, that aims to circumvent the challenges posed by the structural complexity of the flow and give a concise and insightful representation of the blood flow patterns within the heart. Aside from the main visualization technique this works also introduces a novel probing technique that highlights the base principles of the FTLE fields to provide the user with a better understanding of how a FTLE field works.
We would like to congratulate Casper with his achievement and new title and wish him all the best for the future!