摘要
光线投射法是三维直接体绘制算法中的一种最基本方法,但简单的光线投射算法存在采样效率低和绘制速度 慢的缺点。本文充分利用对象空间与图像空间的各种相关性,利用对象空间中数据场的相关性,对采样点处的均匀性区域 采用正方体进行度量,并以此来确定采样步长,在射线方向上采用自适应的采样方式,避免在采样点周围均匀性区域中重 复地进行采样,大大地提高了三维数据场的绘制速度。
Ray casting is a basic algorithm of volume rendering. The basic ray casting method has some shortcomings, such as low sampling efficiency and low speed. Some improvements for the basic ray casting algorithm are made, which make use of various kinds of coherences of the image space and the object space, to accelerate the visualization of the 3D data field. Based on the coherences of the object space, the homogeneous range is measured by the cube which defines the sample length. The sample is adaptively processed to avoid the repeated sampling inside the homogeneous range.
出处
《计算机工程与科学》
CSCD
2005年第2期33-35,共3页
Computer Engineering & Science
基金
国家863计划资助项目(20010487030)
