质点-弹簧模型驱动的体数据模型快速变形模拟

探讨三维体数据模型的快速真实感变形模拟和绘制方法。该方法用离散的质点-弹簧模型具有物理真实感地模拟变形过程；利用FFD从离散质点的运动信息插值求得体数据空间任意点的变形；而将重采样和绘制过程融为一体的光线虚拟弯曲技术和光线提前终止技术则避免了将大量无用计算，使变形和绘制速度明显提高；根据局部变形的连续线性特性提出了光照修正算法，算法实现简单，算出的光照浓淡变化具有高的真实感。

Fast Volume Deformation Simulation Using Mass-Spring Model

Fast realistic volume deformation and rendering methods were discussed, The physically realistic deformation was simulated by using discrete mass-spring model. The deformation of an arbitrary point in the volume space was interpolated using the movement information of the discrete mass points by FFD. The volume resample for generating deformed volume and the rendering procedure was integrated into a single rendering pass by taking advantage of inverse-ray deformation. In addition to the inverse-ray deformation technique, the early-ray-termination helped to avoid a lot of worthless computation; hence the developed methods considerably improved the deformation and rendering performance. An efficient shading adjusting method was integrated into the deformation scheme, which exploited the continuity and linearity of local deformation and gave high realistic shading.