Browsing by Subject "Sketching"

Now showing 1 - 9 of 9

Open Access
3D hair design and key frame animation in real time
(2008) Başarankut, Barkın
Computer generated animations of humans, animals and all other kinds of objects have been studied extensively during the last two decades. The key for creating good animations has been to correctly imitate the behaviors of real objects and reflect these into computer generated images. With the rapid development of computer technology, creating realistic simulations has become possible, and the most striking components of these realistic animations happen to be the most dynamic (moving) parts; hair, in the case of human animations. With the development of high quality hair animations, the concern is not only creating physically correct animations, but also controlling these animations. An implementation of a key frame hair animation creation system, supported by a hair design tool, helping to model and animate hair easily, and provide these functionalities in real time is the aim of the proposed system. This work reviews several hair animation and sketching techniques, and proposes a system that provides a complete level of control (capable of controlling even the individual hair strands) of key frame animation and hair design in real time.
Open Access
3D Hair sketching for real-time dynamic & key frame animations
(Springer, 2008-07) Aras, R.; Başarankut, B.; Çapın, T.; Özgüç, B.
Physically based simulation of human hair is a well studied and well known problem. But the "pure" physically based representation of hair (and other animation elements) is not the only concern of the animators, who want to "control" the creation and animation phases of the content. This paper describes a sketch-based tool, with which a user can both create hair models with different styling parameters and produce animations of these created hair models using physically and key frame-based techniques. The model creation and animation production tasks are all performed with direct manipulation techniques in real-time. © 2008 Springer-Verlag.
Open Access
3D hair sketching for real-time hair modeling and dynamic simulations
(2008) Aras, Rıfat
Hair has been an active research area in computer graphics society for over a decade. Different approaches have been proposed for different aspects of hair research such as modeling, simulating, animating and rendering. In this thesis, we introduce a sketch-based tool making use of direct manipulation interfaces to create hair models and furthermore simulate the created hair models under physically based constraints in real-time. Throughout the thesis, the created tool will be analyzed with respect to different aspects of the problem such as hair modeling, hair simulation, hair sketching and hair rendering.
Open Access
Architectural sketch recognition
(1990) Durgun, Fatoş Bengi; Özgüç, Bülent
Sketch recognition is applied to freehand architectural drawings. The purpose is to recognize the architect’s intentions from a quick sketch and generate a detailed drawing. The system can also calibrate itself to interpret the peculiar styles of each individual architect using it. © 1990 Taylor and Francis Group, LLC.
Open Access
Characterization of structural variation through assembly-to-assembly comparison
(2024-09) Çoktalaş, Muhammet Rafi
Structural variations (SVs) are genomic variations affecting more than 50 nucleotides of DNA. SVs play a crucial role in evolution and have critical phenotypic effects on organisms, such as genetic diseases in humans like autism, schizophrenia, epilepsy, and cancer. Thus, SV characterization is of great significance. In the past, read-based methodologies were utilized due to the infeasibility of constructing genome assemblies. However, with technological advancements, assembling genomes has become significantly more feasible, and complete assemblies of human and other primate genomes have been constructed. Despite the high-quality assemblies, SV discovery in human genomes remains challenging due to the genome's repetitive nature and complex rearrangements caused by a combination of SVs. Most existing SV discovery tools operating on genome assemblies require whole genome alignments, leading to high preprocessing times and memory usage. Therefore, new algorithms are still needed to efficiently discover SVs. Here, we propose Strive, a linear time algorithm that operates on genome assembly sketches instead of whole genome alignments to characterize insertions, deletions, and inversions. We evaluated the performance Strive with two experiments: simulated data from the human reference genome (GRCh38.p14 / hg38) and real data using a full genome assembly from the Telomere to Telomere Consortium (CHM13). Strive is able to accurately detect insertions, deletions, and inversions in 11 to 12 seconds in addition to preprocessing times ranging from 50 to 55 seconds. Strive achieved over 95% precision and recall values in the simulations without duplications. In the simulations that included segmental duplications and SNPs and in the experiment with CHM13 assembly, although still maintaining over 95% recall in inversion discovery, the precision and recall for insertions and deletions were lower, suggesting a need for increased robustness to duplications.
Open Access
A dept perception aware pen-based 3D sketching system
(2012) Yıldız, Cansın
This thesis proposes a method that resembles a natural pen and paper interface to create curve based 3D sketches. The system is particularly useful for representing initial 3D design ideas without much effort. Users interact with the system by the help of a pressure sensitive pen tablet, and a camera. The input strokes of the users are projected onto a drawing plane, which serves as a paper that they can place anywhere in the 3D scene. The resulting 3D sketch is visualized emphasizing depth perception by implementing several monocular depth cues, including motion parallax performed by tracking user’s head position. Our evaluation involving several naive users suggest that the system is suitable for a broad range of users to easily express their ideas in 3D. We further analyze the system with the help of an architect to demonstrate the expressive capabilities of the system that a professional can benefit.
Open Access
Designers' cognition in traditional versus digital media during conceptual design
(2001) Bilda, Zafer
Designers depend on representations to externalize their design thoughts. External representations are usually in the form of sketches (referred to as traditional media) in architectural design during the conceptual design. There are also attempts to integrate the use of digital representations into the conceptual design in order to construct a digital design medium. This thesis aims at gaining an insight on designers’ cognitive processes while sketching in digital versus traditional media. The analysis of cognitive processes of designers based on their protocols is necessary to reveal their design behaviour in both media. An experiment was designed employing six interior architects (at Bilkent University) solving an interior space planning problem by changing the design media they work with. In order to encode the design behaviour, a coding scheme was utilized so that inspecting both the design activity and the responses to media transition was possible in terms of primitive cognitive actions of designers. The analyses of the coding scheme constituents, which are namely segmentation and cognitive action categories enabled a comparative study demostrating the effect of the use of different media in conceptual design phase. The results depicted that traditional media had advantages over the digital media such as supporting perception of visual-spatial features, and organizational relations of the design, production of alternative solutions and better conception of the design problem. These results also emerged implications for the computer aid in architectural design to support the conceptual phase of the design process.
Open Access
An insight on designers’ sketching activities in traditional versus digital media
(Pergamon Press, 2003-01) Bilda, Z.; Demirkan, H.
This study aims at gaining an insight on designers' cognitive processes while sketching in digital vs traditional media. Empirical data on design processes have been obtained from protocol analyses of six interior designers solving an interior space-planning problem through media transition. In order to encode the design behavior, a coding scheme was utilized that allowed the inspection of both the design activity and the responses to media transition in terms of the primitive cognitive actions of designers. The analyses of the coding scheme constituents, which are segmentation and cognitive action categories, allowed a comparative study demonstrating the effect of the use of different media in the conceptual design phase. The results showed that traditional media had advantages over the digital media, such as supporting the perception of visual-spatial features, and organizational relations of the design, production of alternative solutions and better conception of the design problem. These results also suggested implications for computer aids in architectural design to support the conceptual phase of the design process.
Open Access
Modeling 3D objects with free-form surfaces using 2D sketches
(2011) Akatürk, Emre
Using sketches for 3D modelling is a popular research area, which is expected since using 2D sketches feels natural to most of the artists. Many techniques have been proposed to enable an intuitive and competent tool for 3D object creation. In the light of the previous research in this area, we designed a system that enables creation of 3D free-form objects with details. Our system aims to enable users to easily create simple free-form objects using strokes and perturb their surfaces using sketches that provide contours of details and shading information. We provide the user with the ability to create a 3D simple object just by drawing its silhouette. We take this stroke input and create a simple 3D object. Then we allow the user to shade the parts of the 2D silhouette drawn before. We take the shading information and use shape from shading techniques to create a height map and apply the height map on the surface of the object to construct a perturbed surface for the previously created mesh. With our system, it is possible to create and modify 3D meshes easily and intuitively.