Page - 800 - in Book of Full Papers - Symposium Hydro Engineering

（a）before （b）after Fig. 2 Diagram of Time Adjustment Method 2) Space adjustment mechanism Space adjustment is to change the position of entity to avoiding collisions. It obey the following principles: 1) active entity moves priority; 2) spacious entity moves priority. 3.4. CONSTRUCTION COLLISION DETECTION METHOD In this paper, the bounding box detection method is apply to detect the collision of entities in the virtual scene. Different entities adopt different forms of bounding boxes to satisfy detection accuracy and efficiency in this paper. Collision detection base on the change of the state of each entity in the storehouse, and the change of the state of the storehouse entity follows a certain rules. The simulation of the storehouse construction process can base on the movement status and movement mode of each entity. In order to make the construction process efficient and safe to implement, this paper takes the construction process of the storehouses as the main line, simulates the operation of the construction equipment in the pouring activities as the basic unit in the virtual scene, and analyzes the process collision detection and effect in the simulation process. Finally, the simulation results are record to analysis and optimize the construction process. The workflow as shown in Fig.3. Start Initial Construction Plan Dam Section and Block Start Time Geometry Information Machine Configuration Resources Configuration Initial Virtual Scene Virtual Scene New Scene Environment Models Machine Models Resources Models Determine Construction Method Allocate Scene Resources Load Machine Motion Simulation Moldule Initial Clock, Active Machines Push Δt，Calculate Entities Parameter and Storehouse Status Collision Detection Record Result, Update Scene Finished? Output Construction Information Finish No Yes Fig. 3 Simulation process of surface in virtual scene 800