Physical animation of trees in wind based on GPU
基于GPU的风中树木物理动画*

This paper introduced a new real-time tree animation method that was both significantly faster and more physically plausible than previous methods. Taking physical model of branches as linearly tapered circular beam, analyzed its bending effect and derived the expression of its deflection curve. To enhance computational efficiency, performed a least square fit to the deflection curve equation and then pre-computed its value to 2D-texture which was accessed by GPU run-time. To balance the load on CPU and GPU, this paper designed a hierarchical tree structure model that transfered all the mechanical analysis and calculation to GPU, meanwhile, avoided to segment a branch to model its deformation behavior. Experiments show that the presented method can be completely real-time, realistically simulate the tree in wind,solving the problem of current method in literature that cannot simulate the physical real-time animation of tree in wind.