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In this paper, the algorithm of Tiled Directional Flow (TDF) is improved for real-time rendering river surface. To represent the reality of river flowing, the approach for building the river velocity field based on the procedural method is proposed. And the velocity field can be used to generate the flow texture of the TDF algorithm. With combining GPU, GLSL programming and LOD technique, the large...
This work presents sea wind speed model and wind disturbance model for Dynamic Positioning (DP) simulator. There were several problems in the existing DP simulator: wind speed was constant, or wind coefficients of wind disturbance was taken as to the feedforward force wind coefficients directly, or wind speed was not filtered. It caused that the feedforward force was equal to the wind disturbance,...
This paper develops an improved model predictive controller (MPC) for the dynamic positioning system of vessels by using the Laguerre functions. The set of Laguerre networks is introduced to describe the future control increment trajectory, which has fewer parameter to adjust. The improved model predictive controller have the advantages of the traditional model predictive control, which has the good...
Light interaction considering scattering and absorbing is implemented with some simplicity physically. Dead reckoning based calculation is used during the implementation. After the 3D cloud being integrated using cellular automata clouding modeling method, experimental results show that it has realistic effect with fast rendering speed on a common PC. The method in this paper is very suitable for...
In order to avoid the sudden events and deal with the safety problems in time in practical navigation, the simulation models of route planning and route monitoring are put forward, the theory and the algorithm of indicator kirge are applied in the research of route planning so that the water depth of anyplace is computed by fitting curved surface of sea-bottom terrain, the way of human-machine interaction...
A novel method for simulating large-scale, nearshore sea surface is presented. The whole simulating process can be divided into two phases: pre-computing phase and real-time computing phase. In pre-computing phase, wave parameter distribution of a simulation area is worked out using the SWAN (Simulating WAves Nearshore) model on a coarse grid. In real-time computing phase, a small height field surrounding...
A new method for nearshore wave simulating is introduced. Firstly, parabolic mild-slope equations are set up according to the simulation area and input waves. After solving the equations, the integral wave parameters such as the root mean square wave height, the peak wave period and the mean wave direction can be calculated. Instantaneous surface elevations can also be obtained from the model. Then,...
Based on the previous work of modeling dynamic 3D cloud using Cellular Automata, this paper renders realistic 3D cloud for Marine Search and Rescue Simulator visual system in real-time. Physically based light interaction is implemented by Open Scene Graph with a common PC. Light scattering and absorbing is considered. After the 3D cloud integrated into the visual scene, experimental results show that...
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