1.(RESEARCH) Propose a practical use for glCullFace(GL_FRONT_AND_BACK). 2. Modify Program 5.1 by adding the “noperspective” declaration to the texture coordinate vertex attributes, as described in...

1.(RESEARCH) Propose a practical use for glCullFace(GL_FRONT_AND_BACK). 2. Modify Program 5.1 by adding the “noperspective” declaration to the texture coordinate vertex attributes, as described in Section 5.11. Then rerun the program and compare the output with the original. Is any perspective distortion evident? 3. Using a simple “paint” program (such as Windows “Paint” or GIMP [GI16]), draw a freehand picture of your own design. Then use your image to texture the pyramid in Program 5.1.