Icosahedron

gistfile1.txt

ofMesh ico = createIcosahedron(120);

ofMesh testApp::createIcosahedron(float size) {
    
    ofMesh mesh;
    GLdouble vertexB[][3]= {
        {0, -0.525731, 0.850651},             // vertices[0]
        {0.850651, 0, 0.525731},              // vertices[1]
        {0.850651, 0, -0.525731},             // vertices[2]
        {-0.850651, 0, -0.525731},            // vertices[3]
        {-0.850651, 0, 0.525731},             // vertices[4]
        {-0.525731, 0.850651, 0},             // vertices[5]
        {0.525731, 0.850651, 0},              // vertices[6]
        {0.525731, -0.850651, 0},             // vertices[7]
        {-0.525731, -0.850651, 0},            // vertices[8]
        {0, -0.525731, -0.850651},            // vertices[9]
        {0, 0.525731, -0.850651},             // vertices[10]
        {0, 0.525731, 0.850651}               // vertices[11]
    };
    GLdouble colorsB[][4] = {
        {1.0, 0.0, 0.0, 1.0},
        {1.0, 0.5, 0.0, 1.0},
        {1.0, 1.0, 0.0, 1.0},
        {0.5, 1.0, 0.0, 1.0},
        {0.0, 1.0, 0.0, 1.0},
        {0.0, 1.0, 0.5, 1.0},
        {0.0, 1.0, 1.0, 1.0},
        {0.0, 0.5, 1.0, 1.0},
        {0.0, 0.0, 1.0, 1.0},
        {0.5, 0.0, 1.0, 1.0},
        {1.0, 0.0, 1.0, 1.0},
        {1.0, 0.0, 0.5, 1.0}
    };
    
    // indicates the order
    // 20 triangle faces & 3 points = 60
    // sucks we have to use this
    // what are the defautls
    static const GLubyte icosahedronFaces[] = {
        1, 2, 6,
        1, 7, 2,
        3, 4, 5,
        4, 3, 8,
        6, 5, 11,
        5, 6, 10,
        9, 10, 2,
        10, 9, 3,
        7, 8, 9,
        8, 7, 0,
        11, 0, 1,
        0, 11, 4,
        6, 2, 10,
        1, 6, 11,
        3, 5, 10,
        5, 4, 11,
        2, 7, 9,
        7, 1, 0,
        3, 9, 8,
        4, 8, 0,
    };
    GLdouble normalB[][3] = {
        {0.000000, -0.417775, 0.675974},
        {0.675973, 0.000000, 0.417775},
        {0.675973, -0.000000, -0.417775},
        {-0.675973, 0.000000, -0.417775},
        {-0.675973, -0.000000, 0.417775},
        {-0.417775, 0.675974, 0.000000},
        {0.417775, 0.675973, -0.000000},
        {0.417775, -0.675974, 0.000000},
        {-0.417775, -0.675974, 0.000000},
        {0.000000, -0.417775, -0.675973},
        {0.000000, 0.417775, -0.675974},
        {0.000000, 0.417775, 0.675973}
    }; //36
    
    for(int i = 0 ; i < 12; i++) {
        
        // vertex
        ofVec3f v;
        v.x = vertexB[i][0] * size;
        v.y = vertexB[i][1] * size;
        v.z = vertexB[i][2] * size;
        mesh.addVertex(v);
        
        // normal- meeded for lighting
        ofVec3f n;
        n.x = normalB[i][0];// * 100;
        n.y = normalB[i][1];// * 100;
        n.z = normalB[i][2];// * 100;
        mesh.addNormal(n);
        
        // color
        ofFloatColor c;
        c.set( colorsB[i][0], colorsB[i][1], colorsB[i][2], 1.0f);
        mesh.addColor( c );
    }
    
    for(int i = 0 ; i < 60; i++) {
        mesh.addIndex(icosahedronFaces[i]);
    }
    
    return mesh;
}