Real time volumetric rendering optimization approach for cloudscapes in virtual environment

There is a great demand for visualizing natural atmospheric clouds in a realtime environment. However, the challenge is maintaining the cloud visualization system performance due to the high computational cost, high sampling cost, intensive main memory consumption, and the deterioration of system pe...

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Main Author:	Zamri, Muhamad Najib
Format:	Thesis
Language:	English
Published:	2022
Subjects:	QA75 Electronic computers Computer science
Online Access:	http://eprints.utm.my/id/eprint/101544/1/MuhamadNajibZamriPSC2022.pdf.pdf
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id	my-utm-ep.101544
record_format	uketd_dc
spelling	my-utm-ep.1015442023-06-21T10:41:39Z Real time volumetric rendering optimization approach for cloudscapes in virtual environment 2022 Zamri, Muhamad Najib QA75 Electronic computers. Computer science There is a great demand for visualizing natural atmospheric clouds in a realtime environment. However, the challenge is maintaining the cloud visualization system performance due to the high computational cost, high sampling cost, intensive main memory consumption, and the deterioration of system performance. Therefore, this research aimed to optimize the rendering performance of a real-time atmospheric cloudscape visualization system via a set of efficient methods considering the volumetric cloud data as the input, the fly-through navigation as the user interaction, and the realistic real-time features as the output of the generated image. First, the volumetric-based path tracing method was enhanced by reducing the number of ray castings during the intersection test and determining the new pixels via the frame-toframe coherence mechanism. Second, the multiple light scattering method was improved by limiting the maximum number of sampling steps during the light bouncing procedure when calculating the lighting effects in the virtual environment. Third, the new hybrid visibility acceleration method was proposed. It took into account the view-dependency and multi-resolution cloud level of detail, focusing on distancebased view volume segments and the optimized view frustum culling method to remove the invisible regions of clouds in a real-time environment. Based on the experiment conducted, the proposed approach in the prototype system was capable of achieving about 3.83 to 18.58 times faster computational time. This showed an increase of approximately 2.53 to 19.21 times in rendering speed and consumed about 20.63% of the total computer’s main memory space compared to previous systems. Furthermore, all the domain experts have reviewed and verified that the prototype system has effectively produced high visual realism of the generated images. Based on the results of this study, an improved real-time volumetric cloudscape rendering optimization approach has been successfully developed to address the inability of realtime rendering used in previous methods. 2022 Thesis http://eprints.utm.my/id/eprint/101544/ http://eprints.utm.my/id/eprint/101544/1/MuhamadNajibZamriPSC2022.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:150615 phd doctoral Universiti Teknologi Malaysia Faculty of Engineering - School of Computing
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QA75 Electronic computers Computer science
spellingShingle	QA75 Electronic computers Computer science Zamri, Muhamad Najib Real time volumetric rendering optimization approach for cloudscapes in virtual environment
description	There is a great demand for visualizing natural atmospheric clouds in a realtime environment. However, the challenge is maintaining the cloud visualization system performance due to the high computational cost, high sampling cost, intensive main memory consumption, and the deterioration of system performance. Therefore, this research aimed to optimize the rendering performance of a real-time atmospheric cloudscape visualization system via a set of efficient methods considering the volumetric cloud data as the input, the fly-through navigation as the user interaction, and the realistic real-time features as the output of the generated image. First, the volumetric-based path tracing method was enhanced by reducing the number of ray castings during the intersection test and determining the new pixels via the frame-toframe coherence mechanism. Second, the multiple light scattering method was improved by limiting the maximum number of sampling steps during the light bouncing procedure when calculating the lighting effects in the virtual environment. Third, the new hybrid visibility acceleration method was proposed. It took into account the view-dependency and multi-resolution cloud level of detail, focusing on distancebased view volume segments and the optimized view frustum culling method to remove the invisible regions of clouds in a real-time environment. Based on the experiment conducted, the proposed approach in the prototype system was capable of achieving about 3.83 to 18.58 times faster computational time. This showed an increase of approximately 2.53 to 19.21 times in rendering speed and consumed about 20.63% of the total computer’s main memory space compared to previous systems. Furthermore, all the domain experts have reviewed and verified that the prototype system has effectively produced high visual realism of the generated images. Based on the results of this study, an improved real-time volumetric cloudscape rendering optimization approach has been successfully developed to address the inability of realtime rendering used in previous methods.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Zamri, Muhamad Najib
author_facet	Zamri, Muhamad Najib
author_sort	Zamri, Muhamad Najib
title	Real time volumetric rendering optimization approach for cloudscapes in virtual environment
title_short	Real time volumetric rendering optimization approach for cloudscapes in virtual environment
title_full	Real time volumetric rendering optimization approach for cloudscapes in virtual environment
title_fullStr	Real time volumetric rendering optimization approach for cloudscapes in virtual environment
title_full_unstemmed	Real time volumetric rendering optimization approach for cloudscapes in virtual environment
title_sort	real time volumetric rendering optimization approach for cloudscapes in virtual environment
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Engineering - School of Computing
publishDate	2022
url	http://eprints.utm.my/id/eprint/101544/1/MuhamadNajibZamriPSC2022.pdf.pdf
_version_	1776100723290800128

Real time volumetric rendering optimization approach for cloudscapes in virtual environment

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