1. Computer Graphics Through OpenGL: From Theory to Experiments, Second Edition
Chapter 9

2. Figure 9.1: Meeting of the Tree Huggers' Union.

3. Figure 9.2: A bowl of
two colors.

4. Figure 9.3: PQR is
oriented CCW to the
viewer, so it's rendered
(red triangle on the
viewing face) according to
properties for its front face.

5. Figure 9.4: Was the inside of the bowl red or green?

6. Figure 9.5: v0v1v2
appears CW from O.

7. Figure 9.6: A
quadrilateral.

8. Figure 9.7: The plane p contains the triangle PQR: the orientation of PQR depends
on which side of p the viewer is located.

9. Figure 9.8: (a) Consistently oriented triangulation (b) Inconsistently oriented

10. Figure 9.9: OpenGL spray-painting bots.

11. Figure 9.10: Man looking at both sides of a consistently oriented wall.

12. Figure 9. 11: Screenshots for (a) Experiment 9. 2 and (b) Experiment 9

13. Figure 9. 12: Screenshots of (a) squareOfWalls
Figure 9.12: Screenshots of (a) squareOfWalls.cpp and (b) threeQuarterSphere.cpp.

14. Figure 9.13: Non-orientable surfaces.

15. Figure 9. 14: First three closed surfaces, next two non-closed
Figure 9.14: First three closed surfaces, next two non-closed. The closed sphere is not
shaded to reveal the inside; the green back face of a triangle is not visible from outside
the sphere.

16. Figure 9. 15: Screenshots for (a) Experiment 9. 7 (b) Experiment 9
Figure 9.15: Screenshots for (a) Experiment 9.7 (b) Experiment 9.7 (disable culling
commented out) (c) Experiment 9.8.

17. Figure 9. 16: Screenshots from Experiment 9
Figure 9.16: Screenshots from Experiment 9.9: (a) Original (b) Wrongly reflected (c)
Correctly reflected.