Dynamic Caustics And Shadow Rendering Based On Radiance Transfer Field

In this paper, we made a short introduction of the history of photo-realistic rendering, and compared the PRT (Precomputed Radiance Transfer) technique with traditional rendering techniques. Then we summarized the techniques relative to PRT framework and found that existing method cannot work well in rendering caustics effect and high-frequency shadows of dynamic scenes and in environment lighting. And those are the main problems this paper wants to solve.Rendering caustics effect under environment lighting is a difficult question, since the caustics effect is complex and the complexity is even enhanced by the environment lighting. However, we presented a novel transfer matrix sampling method, by which we can render quite plausible caustics effect in dynamic scene without using much compute resources.The following chapter introduced a new way to render the shadow by minus the sheltered light effect from the un-sheltered direct lighting and rewrote the rendering equation, so that we can use the novel transfer matrix from the previous chapter to render the plausible high-frequency shadow of the dynamic scene in the environment lighting. Different from the shadow field, rendering using this method is faster and the objects can translate and rotate respectively.