The Research On Key Technology Of Three Dimension Scene For Coastguard Vessel Formation Combat Training Simulator

With the continuous concern for the maritime rights and interests,as well as sustained development of simulation technology at home and abroad,in order to achieve the sufficient application of ship handling simulator in the military field,which enables coastguard to practice tactics under the immersed environment so as to speed up the skill training of China coastguard,therefore,the coastguard vessel formation combat training simulator arises at the right moment.The paper carries on research on the key technology of three dimension scene for coastguard vessel formation combat training simulator,the research content applied with key technology has the following three aspects,which includes the realization of the water particle collision detection,the optimization of artillery ballistic trajectory and the optimization and control of the fire smoke.In the implementation of the collision detection between the water particles and the hierarchical bounding box based on the target ship,the paper selected the AABB bounding box by comparison and constructed the AABB bounding box which was close to the target ship based on the principle of the top-down,then built the particle ray which was used to traverse layer by layer to achieve accurate collision detection.On the basis of the designed editor of water cannon system,the paper realized the splash effect of spray when the water column hit the target ship,and the change of the intensity of the bounce generated by the change of emission force of water cannon.In the optimization of ballistic trajectory generated by the artillery,the paper established the trajectory model which considered that the resistance was proportional to the speed of shell in flight based on the original trajectory model that had no wind resistance condition,and the particle system of trail was shown in the scene.On the basis of the designed editor of artillery system,the paper could implement the editing of launch speed,launch angle and wind resistance parameter,and acquired the trajectory which was long and straight when it was in the rising stage and relatively short and curved when it was in the descending arc phase in the case of larger wind resistance parameter.In the optimization and control of fire smoke,the paper conducted the texture sampling for each particle normal,and rotated each particle,then achieved the effect of rolling and rising flame smoke.On the condition of editing wind direction,the paper made the deflection effects of flame smoke under the influence of wind come true.On the whole,the paper solved the three problems which existed in the three dimension scene of the coastguard vessel formation combat training system,and the problems were as follows,which included that the water column penetrated the hull,the trajectory was simple and single,as well as fire smoke couldn’t be deflected by the wind.The achievements of the study promoted the practical value of the system.