CS 553 -- Winter Quarter 2009

Project #5: Wireframe Isosurfaces

80 Points

Due: January 30

This page was last updated: January 6, 2009

Requirements:

1. Put this project number and your name in the title bar.

2. The scenario is that you are visualizing the same volume of points that you did in Projects #2, #3, and #4. Because it is an equation, the number of points you use is up to you.

3. Compute a scalar value at each 3D node point according to the same formula you used in Projects #3 and #4.

4. Draw a wireframe isosurface using the same color transfer function you used in Projects #3 and #4.

5. Redraw the wireframe isosurface in response to a T* GLUI spinner or slider.

6. Display an X-Y-Z set of axes as a reference. Allow these to be toggled on and off from a GLUI checkbox.

7. Allow the user to toggle between orthographic and perspective projections using a GLUI checkbox.

8. Allow scaling and X-Y rotation of the 3D scene.

Suggestions:

• It is not an accident that Project #5 is due the same day as Project #4. You might find it useful (and less work) to put both sets of functionality into one program instead of two. If you do this, just turn in the program as Project #4, but put the text "Project 4 and 5" in the titlebar. Do not then also turn in a separate Project #5.

• Setup a three dimensional array representing the discrete nodes in the volume. For example:

  
  struct node
  {
  	float x, y, z;
  	float t;
  };
  
  struct node  Nodes[NX][NY][NZ];
  
  

• Remember that you draw wireframe isosurfaces by drawing 2D contour slices in all three directions:

  for( int i = 0; i < NX; i++ )
  {
  	<< Draw contours for the plane Nodes[i][*][*] >>
  }
  
  for( int j = 0; j < NY; j++ )
  {
  	<< Draw contours for the plane Nodes[*][j][*] >>
  }
  
  for( int k = 0; k < NZ; k++ )
  {
  	<< Draw contours for the plane Nodes[*][*][k] >>
  }
  

• Use a small value for NX, NY, and NZ to start with (5?) so that debugging printout will have some meaning.

• If you did Project #4 by writing the recommended ProcessQuad() routine, you can re-use it in this project.

Grading: