SUBDIVISION SURFACE MID-SURFACE RECONSTRUCTION OF TOPOLOGY OPTIMIZATION RESULTS AND THIN-WALLED SHAPES USING SURFACE SKELETONS

Polygon meshes and particularly triangulated meshes can be used to describe the shape of different types of geometry such as bicycles, bridges, or runways. In engineering, such polygon meshes can occur as finite element meshes, resulting from topology optimization or laser scanning. This article presents an automated parameterization of polygon meshes into a parametric representation using subdivision surfaces, especially in topology optimization. Therefore, we perform surface skeletonization on a volumetric grid supported by the Euclidian distance transformation and topology preserving and shape-preserving criterion. Based on that surface skeleton, an automated conversation into a Subdivision Surface Control grid is established. The final mid-surface-like parametrization is quite flexible and can be changed by variating the control gird or the local thickness.

Sketchsurfaces : sketch-line initialized deformable surfaces for efficient and controllable interactive 3D medical image segmentation

This thesis presents an intuitive, fast and accurate interactive segmentation method for visualizing and analyzing 3D medical images. This method combines a general deformable subdivision surface model with a novel sketch-line user initialization process. The model is simply and precisely initialized with a few quick sketch lines drawn across the width of the target object on several key slices of the volume image. The smooth surface constructed using these lines is extremely close to the shape of the object boundary, making the model's task of snapping to this boundary much simpler and hence more likely to succeed in noisy images with minimal user editing. This subdivision-surface based deformable model provides a foundation for precise user steering/editing capabilities and all of the simple, intuitive user interactions are seamlessly integrated with advanced visualization capabilities. Furthermore, to demonstrate its efficiency and accuracy, this new model has been used to segment objects from several 3D data sets.

Sketchsurfaces : sketch-line initialized deformable surfaces for efficient and controllable interactive 3D medical image segmentation

This thesis presents an intuitive, fast and accurate interactive segmentation method for visualizing and analyzing 3D medical images. This method combines a general deformable subdivision surface model with a novel sketch-line user initialization process. The model is simply and precisely initialized with a few quick sketch lines drawn across the width of the target object on several key slices of the volume image. The smooth surface constructed using these lines is extremely close to the shape of the object boundary, making the model's task of snapping to this boundary much simpler and hence more likely to succeed in noisy images with minimal user editing. This subdivision-surface based deformable model provides a foundation for precise user steering/editing capabilities and all of the simple, intuitive user interactions are seamlessly integrated with advanced visualization capabilities. Furthermore, to demonstrate its efficiency and accuracy, this new model has been used to segment objects from several 3D data sets.

Augmented Reality Character Topeng Malang Dewi as an Effort to Improve the Quality of Student Learning Media

The preservation of the cultural and artistic heritage of our ancestors is important for us to persevere as a species. The purpose of this research was to introduce Indonesian culture, especially Topeng Malang, to the Indonesian society, particularly the teenagers, using 3D character media, implemented through augmented reality. The study followed the development research method of Borg WR and Gall MD. 3D characters were designed using the low poly subdivision surface technique, with a minimum number of poly but maintaining the detail of the character. Based on the results of the data analysis, the following essential points were obtained: (1) The character design of the Topeng Malang adopted the figures of Dewi Sekartaji and Dewi Walangwati. (2) The character design of the Topeng Malang character represented the posture, nature, and characteristics of the style. The result of this design was the implementation of 3-dimensional masks and character transformation in augmented reality media. Based on the results and the questionnaires used by the author to gather users’ knowledge of the character shape of the augmented reality media of the mask, 49.3% of the responses were found to be very good and 46.4% good. These results certainly add to the positive values of utilizing the 3D character media as a medium to introduce Wayang Topeng Malangan. Keywords: Topeng Malang, 3D character model