1. Radiosity for an environment in which all the surfaces are perfectly diffuse reflectors

2. Radiosity Equation N patches numbered 1 to n b i - Radiosity of patch i - is the light intensity per unit area leaving the patch. a i - Area of patch i e i - Emitted intensity of patch i f ij – form factor between patches i and j ρ i - Reflectivity of patch i Reciprocity Equation f ij a i = f ji a j See Slide 6 & 11 of Radiosity Overview at Siggraph websiteRadiosity Overview at Siggraph website

5. Solving the Radiosity Equation Direct Methods: Gaussian elimination, Iterative methods: Jacobi’s method, Gauss_Seidel method See Slide 11 of Radiosity Overview Part 2 at Siggraph websiteRadiosity Overview Part 2 at Siggraph website

6. Computing Form Factors See Slide 7 of form factors at Siggraph websiteform factors at Siggraph website

8. Hemishpere and HemiCube See Slides 8 &9 of form factors at Siggraph websiteform factors at Siggraph website

9. Nusselt Analog

11. Carrying Out Radiosity Divide the scene into a mesh of patches Compute form factors Establish the radiosity equation Solve the radiosity equation

12. Division of Surface into Patches

13. Siggraph Website on Radiosity http://www.siggraph.org/education/mat erials/HyperGraph/radiosity/overview_1. htm http://www.siggraph.org/education/mat erials/HyperGraph/radiosity/overview_1. htm

14. Power Wall – Large-Scale Rendering

15. Sort_Middle Rendering

16. Sort-Last Rendering

17. An Example

18. Composition Binary-Tree CompositingBinary-Swap Compositing

19. Sort-First Rendering