We enhance the Multilayer Perceptron to map a feature vector not only from the original d-dimensional feature space, but from an intermediate implicit Hilbert feature space in which kernels calculate inner products. T...
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Scientific visualization techniques create images attempting to reveal complex structures and phenomena. Illustrative techniques have been incorporated to scientific visualization systems in order to improve the expre...
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In this paper, we propose a novel mesh deformation approach via manipulating differential properties non-uniformly. Guided by user-specified material properties, our method can deform the surface mesh in a non-uniform...
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ISBN:
(纸本)354035638X
In this paper, we propose a novel mesh deformation approach via manipulating differential properties non-uniformly. Guided by user-specified material properties, our method can deform the surface mesh in a non-uniform way while previous deformation techniques are mainly designed for uniform materials. the non-uniform deformation is achieved by material-dependent gradient field manipulation and Poisson-based reconstruction. Comparing with previous material-oblivious deformation techniques;our method supplies finer control of the deformation process and can generate more realistic results. We propose a novel detail representation that transfonns geometric details between successive surface levels as a combination of dihedral angles and barycentric coordinates. this detail representation is similarity-invariant and fully compatible with material properties. Based on these two methods, we implement a multiresolution deformation tool, which allows the user to edit a mesh inside a hierarchy in a material-aware manner. We demonstrate the effectiveness and robustness of our methods by several examples with real-world data.
We present hierarchical occlusionmaps (HOM) for visibility culling on complex models with high depth complexity. the culling algorithm uses an object space bounding volume hierarchy and a hierarchy of image space occl...
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A novel approach for appearance and geometry completion over point-sampled geometry is presented in this paper. Based on the result of surface clustering and the given texture sample, we define a global texture energy...
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ISBN:
(纸本)354035638X
A novel approach for appearance and geometry completion over point-sampled geometry is presented in this paper. Based on the result of surface clustering and the given texture sample, we define a global texture energy function on the point set surface for direct texture synthesis. the color texture completion is performed by minimizing a constrained global energy using the existing texture on the surface as the input texture sample. We convert the issue of context-based geometry completion into a task of texture completion on the surface. the geometric detail is then peeled and converted into a piece of signed grayscale texture on the base surface of the point set surface. We fill the holes on the base surface by smoothed extrapolation and the geometric details over these patches are reconstructed by a process of gray-scale texture completion. Experiments show that our method is flexible, efficient and easy to implement. It provides a practical texture synthesis and geometry completion tool for 3D point set surfaces.
In this paper, we develop a novel mesh fusion method controlled by sketches, which allows users to construct complex 3D polygon models fast and easily. the user first cuts needed parts from some existing objects and p...
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ISBN:
(纸本)354035638X
In this paper, we develop a novel mesh fusion method controlled by sketches, which allows users to construct complex 3D polygon models fast and easily. the user first cuts needed parts from some existing objects and puts them in right pose. then, a radial basis function (RBF) based implicit surface is adopted to smoothly fuse the parts. To achieve better shape control for the transition part in fusion, our method let users using sketches to specify the expected silhouette. After that, the implicit surface is sampled by particles and meshed into a polygonal surface joining the separated parts into one single model. Compared with other previous methods, our mesh fusion approach overcomes the topological limitations and can merge multiple parts together at once.
graphics processing units (GPUs) are widely used in the area of scientific computing. While GPUs provide much higher peak performance, efficient implementation of real applications on the GPU architectures is still a ...
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Mirage is a peculiar nature phenomenon which is caused by the atmospheric refraction and total internal reflection under special weather conditions. In this paper, we propose a novel method to model and render this ph...
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ISBN:
(纸本)354035638X
Mirage is a peculiar nature phenomenon which is caused by the atmospheric refraction and total internal reflection under special weather conditions. In this paper, we propose a novel method to model and render this phenomenon. We first establish their corresponding atmospheric temperature models. then adhering to the physical law, we calculate the light path and intensity attenuation during its propagation. To simulate the dynamic effect of mirages, we introduce a dynamic model based on atmospheric gravity waves. By incorporating GPU acceleration into the rendering process, different types of dynamic mirages under different conditions can be realistically rendered in real time, demonstrating the formation, change, and disappear of mirages.
the main challenges of realistically simulating the displacement of humanoid pedestrians are twofold: they need to behave realistically and they should accomplish their tasks. Here we present a field potential formali...
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ISBN:
(纸本)354035638X
the main challenges of realistically simulating the displacement of humanoid pedestrians are twofold: they need to behave realistically and they should accomplish their tasks. Here we present a field potential formalism, based upon boundary value problems, that allows a group of synthetic actors to move negotiating space, avoiding collisions, attaining goals in prescribed sequences while at same time producing very individual paths. the individuality of each pedestrian can be set by changing its inner field parameters. this leads to a broad range of possible behaviors without jeopardizing its task performance. Simulate situations as behavior in corridors, collision avoidance and competition for a goal are presented and discussed.
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