15-462 Lecuter 8: Shading in OpenGL

02/14/2002

15-462 Graphics I

Example: Icosahedron

•Define the vertices

•

•For simplicity, avoid the use of vertex arrays

#define X .525731112119133606

#define Z .850650808352039932

static GLfloat vdata[12][3] = {

{-X, 0.0, Z}, {X, 0.0, Z}, {-X, 0.0, -Z}, {X, 0.0, -Z},

{0.0, Z, X}, {0.0, Z, -X}, {0.0, -Z, X}, {0.0, -Z, -X},

{Z, X, 0.0}, {-Z, X, 0.0}, {Z, -X, 0.0}, {-Z, -X, 0.0}

};