Test # 2

Open-book test. No collaboration allowed.

• Initial submission: Email to me your answers and snapshots for Tasks#1~#4 today after two hours of work.  The default time interval is 10:30am~ 12:30pm today.
• Final submission: Email to me your updates of programs, answers, and snapshots for all tasks by 11:30am Tuesday, April 29.

Part I. Lighting and materials

Use light.cpp and material.cpp as the starting framework for this homework and use OpenGL lighting mechanism described in chapter 5 of OpenGL programming Guide to accomplish the tasks described below. For each task, please write a separate .cpp file. (For example, task1.cpp, task2.cpp, task3.cpp, …), and send them as attachments of an email to me together with answers to the questions associated with the programming tasks.

You may need to set the viewing volume appropriately to make the scenes visible.

Task 1: Scene 1: Set up two unit spheres and a light.

• Make the camera located at (0, 0, 4) and looking toward the negative Z direction
• The spheres should be in the locations (3, 0, 0) and (-3, 0, 0) respectively.
• Properly set up the material properties separately to make the first sphere looks like a wooden green ball while the other sphere looks like a shiny blue ball made of metal.
• Set up a single white light. Position the light at the location (0.0, 2.0, 3.0, 1.0).

Task 2: Scene 2: Add a second light into scene 1.

• Set up a second white light into the scene of task1. Position the light at the location (0.0, -2.0, 3.0, 1.0).
• Describe what looks different from the first scene and explain why.

Task 3: Scene 3: Add a second light into scene 1.

• Set up one addition blue light into the scene of task1. Position the light at the location (0.0, -2.0, 3.0, 1.0).
• Describe what looks different from the second scene and explain why.

Task 4: Scene 4: Make the light in scene 1 revolve around a fixed point

• Add an idle function to make the light in the scene of task1 revolve along the circle centered at the point (0.0, 2.0, 0.0) on the plane Y=2 with a radius of 3.
• Describe what looks different from the first scene and explain why.

Part II: Texture mapping

Task 5: Enable lighting with at least one light source and render six objects with texture mapping as described in the following. You can either display them all together as 6 objects in a scene in a single program or as separate objects in separate scenes in one or more programs. Either way is fine. (Useful references: key OpenGL texture mapping commands.)

1. Create and load a texture object loaded with a red-and-black checker board image. (Useful reference: texbind.cpp)
2. Create and load another texture object loaded with an image of a photo scanned or downloaded. (Useful reference: cubeTex.zip) You should include tga.h and tga.cpp in your project and use the function void CreateTexture(GLuint textureArray[], char *strFileName, int textureID) implemented in tga.cpp to load an image from a .tga image file. Note that you can use photoshop or image composer to easily convert any JPEG or JIF image file to or from a .tga image file.)
3. Do texture mapping to have the checker board image mapped onto a rectangle, a glutSolidTeapot and a gluCylinder in the scene.
4. Do texture mapping to have the real world image mapped onto a rectangle, a glutSolidTeapot and a gluCylinder.

More references: See OpenGL 1.1 reference guide about

• how to use gluNewQuadric to create a new glu quadric objects and render a cylinder using gluCylinder as shown in object.cpp,
• how to enable automatic generation of texture coordinates for glu quadric objects such as gluCylinder using gluQuadricTexture, and
• how to use gluQuadricDrawStyle to set the quadric draw style to GLU_FILL to have surfaces filled.

To see a sample TGA picture and an example executable rendering a glutSolidTeapot with texture mapping, download, unzip, and play with this sample demo program.