title: Using Mesh Shaders for isosurface extraction

authors: Elliott, Hamish Robert

subjects: CGI

abstract: This thesis investigates the use of the Mesh Shader graphics pipeline, utilising in particular its ability of parallel and dynamic choice of geometry, to gain computation efficiencies in realising the Marching Cubes isosurface extraction algorithm. The thesis details how the Marching Cubes algorithm was mapped to the Mesh Shader pipeline, to form a baseline implementation. In addition, two heuristic-based variants are presented that reduced the GPUs workload, but at the potential cost of compromising accuracy. In evaluation of the work, a comparison of the baseline Mesh Shader pipeline implementation is made with a previous compute-shader based implementation. We also present a set of experiments that investigate the speed and accuracy of the two heuristic-based variants.

text: Using Mesh Shaders for isosurface extraction This thesis investigates the use of the Mesh Shader graphics pipeline, utilising in particular its ability of parallel and dynamic choice of geometry, to gain computation efficiencies in realising the Marching Cubes isosurface extraction algorithm. The thesis details how the Marching Cubes algorithm was mapped to the Mesh Shader pipeline, to form a baseline implementation. In addition, two heuristic-based variants are presented that reduced the GPUs workload, but at the potential cost of compromising accuracy. In evaluation of the work, a comparison of the baseline Mesh Shader pipeline implementation is made with a previous compute-shader based implementation. We also present a set of experiments that investigate the speed and accuracy of the two heuristic-based variants.

year: 2022

title: Rational descriptive classification of duricrusts

authors: Dury, G.H.

abstract: The term duricrust appears to be extending itself to include calcareous, gypseous, and saline crusts, in addition to crusts composed dominantly of silica and/or of sesquioxides of iron and aluminium, with or without significant contents of dioxides of manganese or titanium. This latter group can be distinguished as duricrusts proper. Its nomenclature is highly confused, and its classification, in writings in the English language, defective. The relevant problems can be resolved, at least in considerable part, by the introduction, adaptation, and extension of modern terms current in tropical pedology, to give a descriptive classification free of genetic implications. When content of SiO₂, Al₂O₃, and Fe₂O₃ is used as a primary basis for the classification of duricrusts proper, plots on a ternary diagram justify the recognition of seven named types in the fersiallitic range.

text: Rational descriptive classification of duricrusts The term duricrust appears to be extending itself to include calcareous, gypseous, and saline crusts, in addition to crusts composed dominantly of silica and/or of sesquioxides of iron and aluminium, with or without significant contents of dioxides of manganese or titanium. This latter group can be distinguished as duricrusts proper. Its nomenclature is highly confused, and its classification, in writings in the English language, defective. The relevant problems can be resolved, at least in considerable part, by the introduction, adaptation, and extension of modern terms current in tropical pedology, to give a descriptive classification free of genetic implications. When content of SiO₂, Al₂O₃, and Fe₂O₃ is used as a primary basis for the classification of duricrusts proper, plots on a ternary diagram justify the recognition of seven named types in the fersiallitic range.

year: 1969

title: Human dimensions of global environmental change: A review of frameworks and research gaps.

authors: Urich, Peter

subjects: global environmental change

abstract: This review of current knowledge in, and development of, priorities for research into the human dimensions of global environmental change has been conducted to assist the Foundation for Research Science and Technology to formulate their research needs agenda. An overview of the emergence of the human dimension of the global environmental change research field is used as a prelude to a review of the international literature on frameworks for conducting human dimensions research. The terminology used in the human dimension field is diverse. An attempt is therefore made to consolidate the myriad of definitions for key concepts, in order to form a basis for human dimensions research in New Zealand and build a platform for the remainder of this report. Three disciplinary areas of academic inquiry were explored in the context of human dimensions of global environmental change research: economics, law and biological sciences. These disciplinary perspectives are reviewed through the international literature and in a New Zealand context. A conceptual framework for research into the human dimensions of global environmental change is provided based on the knowledge-base developed from the both international and New Zealand research. Core concepts, such as found in multidisciplinary and transdisciplinary research are reviewed in historical context to form the basis for a specific research framework for New Zealand. Some general needs for research are derived from the New Zealand framework. The remainder of this report details the methods used for drawing out expert opinion on the priorities for research on the human dimensions of global environmental change in the context of information, knowledge and method. Thirty-eight interviews and two hui were conducted and 254 research needs defined by questions were obtained. A modified Delphi technique was applied to the questions and prioritised lists of responses are provided. The final list
Provides European/Pakeha and Māori perspectives. Divergence and convergence between the European/Pakeha and Māori responses is provided, as well as justification for the prioritisation stance that is taken. This research had four outputs: A conceptual framework for considering the human dimensions of global environmental changes and research contributions; A description of the gaps in knowledge that impede effective response to global change and provisional research needs: one for New Zealand generally, and one on Māori in particular; A network of end-users and research providers that are cognisant of, and contributors to, the human dimensions research assessment; A set of priority research needs pertaining to the human dimensions of global environmental change, in a form suitable for use by FRST.

text: Human dimensions of global environmental change: A review of frameworks and research gaps. This review of current knowledge in, and development of, priorities for research into the human dimensions of global environmental change has been conducted to assist the Foundation for Research Science and Technology to formulate their research needs agenda. An overview of the emergence of the human dimension of the global environmental change research field is used as a prelude to a review of the international literature on frameworks for conducting human dimensions research. The terminology used in the human dimension field is diverse. An attempt is therefore made to consolidate the myriad of definitions for key concepts, in order to form a basis for human dimensions research in New Zealand and build a platform for the remainder of this report. Three disciplinary areas of academic inquiry were explored in the context of human dimensions of global environmental change research: economics, law and biological sciences. These disciplinary perspectives are reviewed through the international literature and in a New Zealand context. A conceptual framework for research into the human dimensions of global environmental change is provided based on the knowledge-base developed from the both international and New Zealand research. Core concepts, such as found in multidisciplinary and transdisciplinary research are reviewed in historical context to form the basis for a specific research framework for New Zealand. Some general needs for research are derived from the New Zealand framework. The remainder of this report details the methods used for drawing out expert opinion on the priorities for research on the human dimensions of global environmental change in the context of information, knowledge and method. Thirty-eight interviews and two hui were conducted and 254 research needs defined by questions were obtained. A modified Delphi technique was applied to the questions and prioritised lists of responses are provided. The final list
Provides European/Pakeha and Māori perspectives. Divergence and convergence between the European/Pakeha and Māori responses is provided, as well as justification for the prioritisation stance that is taken. This research had four outputs: A conceptual framework for considering the human dimensions of global environmental changes and research contributions; A description of the gaps in knowledge that impede effective response to global change and provisional research needs: one for New Zealand generally, and one on Māori in particular; A network of end-users and research providers that are cognisant of, and contributors to, the human dimensions research assessment; A set of priority research needs pertaining to the human dimensions of global environmental change, in a form suitable for use by FRST.

year: 2005-12-01