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Dynamic level of detail
Celba, Pavel ; Beneš, Bedřich (advisor) ; Žára, Jiří (referee)
The work aims to render real-time forest with lighting. Detailed tree models created by professional application are used. A point-based method for level of detail is used for tree model simplification and rendering. The rendering of forest is based on hierarchical view-dependent pseudo-continuous level of detail. The frustum culling is used for scene visibility testing. Novelty hierarchical impostor system is presented to speed up rendering. Two forest lighting models are used. First is directional diffuse lighting to simulate sun light and the second is ambient only lighting model. The work includes implementation of rendering system using shader programs running on graphic card. Utilities are provided for obtaining data from XFrog tree modeling utility, for converting tree to format for viewing, for creating level of detail representation of trees and placing trees into the forest.
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Generation of 3D presentation from floor plan designer
Slančík, Milan ; Žára, Jiří (advisor) ; Pelikán, Josef (referee)
The aim of the thesis is to design and implement an intuitive 3D presentation from a given 2D floor plan. Initial 2D plans are created by an existing floor plan designer. Such a plan needs to be extended in order to add further information necessary for a 3D presentation (e.g. viewpoints, height of the walls, windows/doors position and dimensions) and is followed by an export to the appropriate 3D environment. Floor plans are represented by an XML file. XSL Transformation is then applied to the XML file to create an X3D output describing the scene. A proper X3D browser is then used for a real-time presentation of and smooth navigation in the scene.
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Nefotorealistické zobrazování v reálném čase
Vondrák, Štěpán ; Žára, Jiří (advisor) ; Pelikán, Josef (referee)
The goal of this thesis is to examine non-photorealistic rendering (NPR) methods with respect to their application in real-time rendering and to utilize the features of modern programmable graphics processing units (GPUs) to implement several NPR techniques. To achieve maximal efficiency of the implemented rendering styles, extra care is taken to offload all geometry processing from the CPU to the GPU. Implementations of three image-space edge detectors are presented and compared. Silhouettes, border edges, creases and material boundaries can be identified by detecting discontinuities in an image with worldspace normals, in the second derivative of the depth buffer and in an image with region identifiers. Combination of the edge detectors and a stepped shader is used to render objects in a cartoon style. A novel approach to rendering of a three-dimensional scene in mosaic style is proposed. Unlike previously presented methods, the implemented technique can render complex scenes at interactive framerates. To achieve real-time performance, a simulation of a system of infinitely stiff springs is used instead of centroidal Voronoi diagrams.
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Generation of 3D presentation from floor plan designer
Slančík, Milan ; Pelikán, Josef (referee) ; Žára, Jiří (advisor)
The aim of the thesis is to design and implement an intuitive 3D presentation from a given 2D floor plan. Initial 2D plans are created by an existing floor plan designer. Such a plan needs to be extended in order to add further information necessary for a 3D presentation (e.g. viewpoints, height of the walls, windows/doors position and dimensions) and is followed by an export to the appropriate 3D environment. Floor plans are represented by an XML file. XSL Transformation is then applied to the XML file to create an X3D output describing the scene. A proper X3D browser is then used for a real-time presentation of and smooth navigation in the scene.
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Preparation of VR presentations from CAD models
Kudlvasr, Martin ; Žára, Jiří (advisor) ; Kopecký, Michal (referee)
Title: Preparation of VR presentations from CAD models Author: Martin Kudlvasr Department: Dept. of Software and Computer Science Education, Faculty of Mathematics and Physics, Charles University in Prague Supervisor: Prof.Ing. Jiří Žára, CSc. Supervisor's e-mail address: zara@fel.cvut.cz Abstract: Analysis of a specific problem in virtual engineering department in ŠKODA AUTO, a. s. company, concept of the problem solution and implementation of the solution. Virtual engineering department employees use a Virtual Designer 2 application for creation of virtual reality worlds (new car concept presentations). This application does not fit well for the task of creating versions of these presentations. Maintaining versions using this program is a lengthy and fault- prone process. Application VR Aid solves this problem. It reduces and simplifies frequently repeating tasks and uses intuitive graphical user interface. VR Aid allows to speed up the process of creating new versions of presentations and spares precious employee time. It was designed to complement (and not to disrupt) currently used computer applications (cooperates with Virtual Designer 2, Opera and DeltaGen). Results of this work include new documentation of FHS and VRP file formats. During the application development a new system of communication...
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Dynamic level of detail
Celba, Pavel ; Žára, Jiří (referee) ; Beneš, Bedřich (advisor)
The work aims to render real-time forest with lighting. Detailed tree models created by professional application are used. A point-based method for level of detail is used for tree model simplification and rendering. The rendering of forest is based on hierarchical view-dependent pseudo-continuous level of detail. The frustum culling is used for scene visibility testing. Novelty hierarchical impostor system is presented to speed up rendering. Two forest lighting models are used. First is directional diffuse lighting to simulate sun light and the second is ambient only lighting model. The work includes implementation of rendering system using shader programs running on graphic card. Utilities are provided for obtaining data from XFrog tree modeling utility, for converting tree to format for viewing, for creating level of detail representation of trees and placing trees into the forest.
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Exteriéry a interiéry ve virtuálních městech
Kmoch, Petr ; Sloup, Jaroslav (referee) ; Žára, Jiří (advisor)
Virtual Old Prague is a web-based application for browsing Prague's centre modelled in VRML. This thesis extends the project with support for interior areas and impostors, simplifi ed pieces of geometry used in place of distant models. Interiors are based on existing VOP structure. Automatic generation of interior walls is added, as well as ceilings and lighting. Interiors can be added to the existing model without the need to remodel existing houses. Depth-augmented impostors are introduced into the system. Their geometry is a fully 3D shape based on actual geometry they replace. This allows for better displaying of depth discontinuities compared to a traditional at impostor. A single texture, a pre-rendered image of replaced geometry, is used for the impostor, thus keeping its size small. A Java program is provided for automatic generation of impostors from the model. Two regimes are introduced for using impostors during browsing, with di erent visual quality and performance requirements. Results of performance tests are presented, comparing use of impostors to the original system.
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