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This paper presents a "change'n play" software architecture in order to realize user-centric aspects for, integrated engineering analysis tasks within immersive environments. The proposed architecture has been designed to enable conceptual simulations performed on an engineering mock-up. Major attention is given to the realization of modules and functionalities going far beyond traditional...
If a given 3D polygon has a self-intersecting projection which can bound several in equivalent disk-like surfaces in space, we say the polygon is ambiguous. In this paper, we propose a decomposition scheme for 3D polygons using Gauss diagrams from knot theory, and use it to detect ambiguities of 3D polygons.
Selecting the best views for 3D objects is useful for many applications. However, with the existing methods applied in CAD models, the results neither exhibit the 3D structures of the models fairly nor conform to human's browsing habits. In this paper, we present a robust method to generate the canonical views of CAD models, and the above problem is solved by considering the geometry and visual salient...
Interactively rendering solid CAD models currently relies on tessellation of the models and passing of the tessellation onto the graphics card (GPU). Direct rendering on the GPU, without a tessellation preprocess, has many advantages -- pixel-level quality, less memory requirements, and less preprocessing, to name a few. However, one of the main problems with existing solutions for rendering solid...
In this paper, we present an example-driven symbol recognition algorithm based on its key features in CAD engineering drawings. When user provides an example of a specific symbol, the input symbol is analyzed and its features are extracted automatically. Based on the relation representation, the constrained tree with key feature priority can be established for this type of symbol. By this means, the...
Engineering product development is becoming increasingly collaborative and knowledge-intensive in today's industry. On one hand, the product development process comprises various tasks that involve extensive knowledge exchange and communication among geographically distributed teams. On the other hand, the product development teams usually reuse engineering knowledge from a vast well of previous design...
Because design is an iterative and evolving process, recording and representing designer's thinking process plays an important role for design change and reuse. After giving a brief review of the previous related research, a design thinking process model is created for representing the design thinking process. Its knowledge structure consisting of design intent, design decision, design rationale and...
Geometric constraint problem can be transformed to an optimization problem. We can solve the problem with niche improved particle swarm. Classical particle swarm optimization is likely to be trapped into local minima as well as premature. A niche improved particle swarm optimization (NIPSO) based on niche theory was developed. After the update of the particle velocity and position, the outlier particle...
In the process of numerical simulation, Finite Element Analysis (FEA) is commonly used for product design optimization. The product model has to be modified according to its associated optimization result obtained based on analysis, and the mesh model needs to be regenerated for analysis to verify the modification. In order to reduce the time for mesh regeneration, one effective way is to directly...
In this paper, an accurate and practical camera lens model is proposed to be applied in realistic rendering of lens-related effects. The optical modeling of this new model is firstly presented from two aspects: lens surface modeling and formulation of ray tracing equations. Then, a number of tunable models for controlling lens properties are introduced and combined together to determine overall imaging...
Rendering of volume caustics in participating media is often expensive, even with different acceleration approaches. Basic volume photon tracing is used to render such effects, but rather slow due to its massive quantity of photons to be traced. In this paper we present an image-based volume photon tracing method for rendering volume caustics at real-time frame rates. Motivated by multi-image based...
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