CPSC 102 Computer Science II
(Advanced C Programming)
Assignment 3

Objectives:

Description:

1. Using the object_find_closest() function tested in lab5, implement a simple (one-hit) ray tracer (known as a ray caster) to process the model file given below.
2. See the notes (pp.20-23 in particular).
3. Sample input:
   

   camera cam1
   {
      pixeldim 640 480
      worlddim 8   6
      viewpoint 4 3 6
   }
   
   material green
   {
      ambient 0 5 0
   }
   
   material yellow
   {
      ambient  5 4 0
      diffuse  4 4 0
     specular  1 1 1
   }
   
   plane leftwall
   {
      material green
      normal 3 0 1
      point  0 0 0
   }
   
   plane rightwall
   {
      material yellow
      normal -3 0 1
      point   8 0 0
   }
   
   material gray
   {
      ambient 2 2 2
   }
   
   plane floor
   {
      material gray
      normal 0 1 0
      point  0 -0.2 0
   }
   	

4. Sample output:

   

5. Changing the left and right wall normals' z-components to 0.1, i.e.,

   plane leftwall
   {
      material green
      normal 3 0 0.1
      point  0 0 0
   }
   
   plane rightwall
   {
      material yellow
      normal -3 0 0.1
      point   8 0 0
   }
   	

   and re-running the code produces the image below:

   

6. Using the following cbox.txt model:

   camera cam
   {
      pixeldim 512 384
      worlddim  5.12 3.84
      viewpoint 2.56 2 5
   }
   
   light top
   {
      location 2.56 3.80 -1.5
      emissivity 1 1 1
   }
   
   material gray
   {
      ambient 3 3 3
      diffuse  .9 .9 .9
   }
   
   material green
   {
      ambient 0 5 0
      diffuse 0 .5 0
   }
   
   material salamander
   {
      ambient 3 2 2
      diffuse  .9 .9 .9
   }
   
   material slate
   {
      ambient 2 1.8 3
      diffuse  .9 .9 .9
   }
   
   material transparent
   {
      ambient  3 3 3
      diffuse  .1 .1 .1
     specular  .9 .9 .9
       alpha  .9
         ior  1.83
   }
   
   material chrome
   {
      ambient  3 3 3
      diffuse  .1 .1 .1
     specular  .9 .9 .9
   }
   
   plane backwall
   {
      material gray
      normal 0 0 1
      point  0 0 -5
   }
   
   plane leftwall
   {
      material salamander
      normal 1 0 0
      point  0 0 0
   }
   
   plane rightwall
   {
      material slate
      normal -1 0 0
      point   5.12 0 0
   }
   
   plane ceiling
   {
      material gray
      normal  0 -1 0
      point   0 3.84 0
   }
   
   plane floor
   {
      material gray
      normal 0 1 0
      point  0 -0.2 0
   }
   
   sphere left
   {
      material chrome
      center 1.25 .75 -4
      radius .9
   }
   
   sphere right
   {
      material transparent
      center 3.7 .7 -2.3
      radius .9
   }
   	

   and re-running the code produces the image below:

   

What to hand in:

1. A README file containing
   1. Course id--section no
   2. Name
   3. Assignment description
   4. Brief solution description (e.g., program design, description of algorithm, etc., however appropriate).
   5. Lessons learned, identified interesting features of your program
   6. Any special usage instructions
2. Makefile
3. source code (.h headers and .c source)
4. object code (do a make clean before tar)

How to hand in: