M. Adil Yalçın's WebSite

We present parallel algorithms for processing, extracting and rendering adaptively sampled regular terrain datasets represented as a multiresolution model defined by a super-square-based diamond hierarchy. This model represents a terrain as a nested triangle mesh generated through a series of longest edge bisections and encoded in an implicit hierarchical structure, which clusters triangles into diamonds and diamonds into super-squares. We decompose the problem into three parallel algorithms for performing: generation of the diamond hierarchy from a regularly distributed terrain dataset, selective refinement on the diamond hierarchy and generation of the corresponding crack-free triangle mesh for processing and rendering. We avoid the data transfer bottleneck common to previous approaches by processing all data entirely on the GPU. We demonstrate that this parallel approach can be successfully applied to interactive terrain visualization with a high tessellation quality on commodity GPUs.

@inproceedings{Yalcin11_egpgv,
  author = {Yalçın, M. A. and Weiss, K. and De Floriani, L.},
  title = {GPU algorithms for diamond-based multiresolution terrain processing},
  booktitle = {Eurographics Symposium on Parallel Graphics and Visualization},
  year = {2011},
  address = {Bangor, Wales},
  month = {April 10--11}
  pages = {121--130},
  doi = {http://dx.doi.org/10.2312/EGPGV/EGPGV11/121-130}
}

The applications of computer graphics raise new expectations, such as realistic rendering, real-time dynamic scenes and physically correct simulations. The aim of this thesis is to investigate these problems on the heightfield structure, an extended 2D model that can be processed efficiently by data-parallel architectures. This thesis presents methods for simulation of deformations on heightfield as caused by triangular objects, physical simulation of objects interacting with heightfield and advanced visualization of deformations. The heightfield is stored in two different resolutions to support fast rendering and precise physical simulations as required. The methods are implemented as part of a large-scale heightfield management system, which applies additional level of detail and culling optimizations for the proposed methods and data structures. The solutions provide real-time interaction and recent graphics hardware (GPU) capabilities are utilized to achieve real-time results. All the methods described in this thesis are demonstrated by a sample application and performance characteristics and results are presented to support the conclusions.

@inproceedings{Yalcin11_egpgv,
  author = {Yalçın, M. A. and Weiss, K. and De Floriani, L.},
  title = {GPU algorithms for diamond-based multiresolution terrain processing},
  booktitle = {Eurographics Symposium on Parallel Graphics and Visualization},
  year = {2011},
  address = {Bangor, Wales},
  month = {April 10--11}
  pages = {121--130},
  doi = {http://dx.doi.org/10.2312/EGPGV/EGPGV11/121-130}
}

@incollection{ref,
author = {M. Adil Yalçın and Tolga Çapın},
title = {A Generic Multiview Rendering Engine Architecture},
booktitle = {Game Engine Gems 2},
editor = {Eric Lengyel},
publisher = {A K Peters},
year = {2011},
pages = {179--197}
}

In virtual environments, terrain is generally modeled by heightield, a 2D structure. To be able to create desired terrain geometry, software editors for this specific task have been developed. The graphics hardware, data structures and rendering techniques are developing fast to open up new possibilities to the user and terrain editor functionalities are following such improvements (such as real-time lighting updates during editing operations and multi-texture blending). Yet, current terrain editors mostly fail to give the user feedback about their actions and also fail to help the users understand and undo the editing operations on the terrain. The aim of this study is to investigate the 3d-widget based visualization of possible editing (sculpturing) actions on terrain and to help user undo previous operations.

@INPROCEEDINGS{Yalcin2009,
  author = {Yalcin, M. Adil  and Capin, Tolga K.},
  title = {Editing Heightfield Using History Management And 3d Widgets},
  booktitle = {Computer and Information Sciences, 2009. ISCIS '09. 24th International
	Symposium on},
  year = {2009},
  pages = {452-457},
  month = {September},
}