15-462 Lecture 3: Interaction

01/21/2003

15-462 Computer Graphics I

Step 1: Defining the Vertices

•Use parallel arrays for vertices and colors

/* vertices of cube about the origin */

GLfloat vertices[8][3] =

{{-1.0, -1.0, -1.0}, {1.0, -1.0, -1.0},

{1.0, 1.0, -1.0}, {-1.0, 1.0, -1.0}, {-1.0, -1.0, 1.0},

{1.0, -1.0, 1.0}, {1.0, 1.0, 1.0}, {-1.0, 1.0, 1.0}};

/* colors to be assigned to edges */

GLfloat colors[8][3] =

{{0.0, 0.0, 0.0}, {1.0, 0.0, 0.0},

{1.0, 1.0, 0.0}, {0.0, 1.0, 0.0}, {0.0, 0.0, 1.0},

{1.0, 0.0, 1.0}, {1.0, 1.0, 1.0}, {0.0, 1.0, 1.0}};