A ray-tracing algorithm based on a double-tree image theory

A novel ray-tracing algorithm based on the image theory is presented. The main idea is the use of the images of both transmitter and receiver to establish the corresponding images' trees and the pertinent ray paths. Although it may seem a paradox, the implementation of both trees, in some cases, actually reduces the total amount of stored data, as the last level of the transmitter's tree adopted in conventional algorithms is not necessary. Some case studies are present to demonstrate this feature.