1. CS552: Computer Graphics Lecture 35: Rendering

2. Recap Illumination Model o Light Source and surface o Effect of multiple light source o Colored lights and surface o Effect of atmosphere o Refraction

3. Objective After completing this lecture, students will be able to o Apply different shading method for rendering

4. Atmospheric Attenuation Depth-cue color Previously computed color Scale factor Depth cueing

5. Shading Models for Polygon We can shade any surface by o Calculating the surface normal at each visible point o Applying the desired illumination model at that point. This approach is computationally expensive There are efficient techniques to achieve the desired effect

6. Constant Shading

7. Gouraud Surface Rendering Also referred to as intensity-interpolation surface rendering

8. Illumination interpolation

9. Incremental approach

10. Illustration

12. Phong Surface Rendering A more accurate interpolation method for rendering a polygon mesh Normal-vector interpolation rendering o Interpolates normal vectors instead of intensity values

13. Illustration

14. Illustrations

15. Thank you Next Lecture: Rendering