图形硬件加速的Raycasting体可视化算法研究

Raycasting algorithm for volume visualization was implemented based on GPU. FBO (FrameBuffer Object) offscreen rendering technology was adopted to preprocess the raycasting sample poins in/out of the volume space to reduce the sampling frequency. The strategy of separating 3D texture and color transfer function was used to decrease the video memory. The experiment result shows that the proposed algorithm has nearly the same performance as traditional 3-D texture mapping algorithm under the less video memory capacity, and the method could be used in large scale volume rendering to reduce the load time of data Scheduling.