An accelerating ray casting algorithm based on discarded sampling
Zhang Yi-li · Applied science and technology · 2008
Ray casting is an important algorithm in direct volume rendering,but the computation of sampling-points on ray is time-consuming,a crucial factor affecting real-time rendering.According to the correlation of object space,a fast rendering technique is developed by abandoning the line segments that have little contributions in the sampling progress.Meanwhile,the samplingpoints and their characteristic values can be found quickly from the intersected points of some plane families.Therefore,the image quality is greatly improved by combining the adaptive sampling method.With this scheme,the complexity of accelerating algorithm decreases obviously and the rendering speed increases by 20%.