1. Multiple vertex merging Kun Xu

2. Previous works Photon mapping – Generate various light sub-paths and eye sub- paths – Merge a light sub-path and an eye sub-path to a full path – But, merge at ONLY ONE vertex

3. Our idea Light sub-path vertex Eye sub-path vertex

4. Our idea Light sub-path vertex Eye sub-path vertex

5. Naïve implementation of our approach

6. Fast evaluation by caching

7. Details How to calculate weight, probability and contribution? – Details coming soon … How to exactly do the caching scheme – Like walking on a “graph”

8. Discussion Will the proposed scheme better work for scattering media?

9. Probability Evaluation

10. Weight