Advances for achieving user control of a dynamic simulation of linked figures is presented. The formulation integrates forward and inverse kinematics specification within a mixed method of forward and inverse dynamics...
详细信息
Recent hardware advances for both enhanced computing and interactive graphics are used to improve the effectiveness of three-dimensional engineering simulations. The two examples presented, drawn from structural engin...
详细信息
Recent hardware advances for both enhanced computing and interactive graphics are used to improve the effectiveness of three-dimensional engineering simulations. The two examples presented, drawn from structural engineering, deal with the fully nonlinear transient dynamic analysis of frames and boundary element stress analysis.
The zonal method for calculating radiative transfer in the presence of a participating medium is applied to the generation of realistic synthetic images. The method generalizes the radiosity method and allows for emis...
详细信息
ISBN:
(纸本)0897912276
The zonal method for calculating radiative transfer in the presence of a participating medium is applied to the generation of realistic synthetic images. The method generalizes the radiosity method and allows for emission, scattering, and absorption by a participating medium. The zonal method accounts for volume/surface interactions which have not been previously included, as well as volume/volume and surface/surface interactions. In addition, new algorithms, based on the hemi-cube formulation, are introduced for calculating the geometric factors required by the zonal method.
The advent of supercomputer technology has greatly increased the power available to process and analyse larger and more complex geometric models than are currently in use. A comprehensive experimental geometric modell...
详细信息
The advent of supercomputer technology has greatly increased the power available to process and analyse larger and more complex geometric models than are currently in use. A comprehensive experimental geometric modelling system is presented, which exploits this new technology by allowing for the description of highly complex environments, providing flexible creation and editing facilities, and introducing the capability to model dynamic environments. The system interfaces to various shading and realistic image synthesis routines, and attempts to overcome the restrictions of current display technology. Close attention is paid to the user interface so as not to limit interaction to any particular modelling methodology. To this end, a variety of geometries, an expandable set of object generation routines, and many geometric editing tools are supported. Hierarchical and adjacency associations are also definable between the elements in an environment. To provide a means for dynamic simulation, tools to define object motion are also provided. Environment descriptions are organized into a partitioned database, composed of hierarchical and relational data constructs, allowing for selective subdivision of a complex model into component units and efficient database management.
The radiosity method for computing the interreflection of light within diffuse environments is described. The development of the method for realistic image synthesis over the past three years is outlined. A short disc...
详细信息
The principles of tristimulus colorimetry are presented in tutorial fashion. The classic color matching experiments are described with an emphasis on the assumptions that are implicit in these tests and on the units o...
详细信息
An efficient algorithm is introduced for the production of realistic image sequences of dynamic environments. The practicality of the radiosity method, which computes the interreflection of light within complex diffus...
详细信息
An important aspect in generating images of real materials and surfaces is the contribution of the visual effects of textures. This study presents methods for simulating a variety of different textures. Two general ty...
详细信息
An important aspect in generating images of real materials and surfaces is the contribution of the visual effects of textures. This study presents methods for simulating a variety of different textures. Two general types of texture, geometric and spectral, are simulated. Geometric textures incorporate the irregularities and variations which can be found in the shape and form of real surfaces. Spectral textures involve variations of the properties of materials which cause the absorption of specific wavelengths of light. An integrated system for image synthesis which is based on ray tracing is used as the testbed for the texturing research. Previous methods of texturing are adapted by ray tracing, and some new methods for simulating heterogeneous materials are presented.
An algorithm for determining visible lines or visible surfaces in polygonal form, at object resolution, is presented. The original scene must consist of nonintersecting planar polygons. The procedure relies on image c...
详细信息
Vehicle operating policies are developed and a longitudinal controller is designed to satisfy the stringent performance criteria of an Automated Guideway Transit (AGT) System operating under model-reference control. T...
详细信息
暂无评论