Programming and Graphics

250 Introduction to C++ Programming and Graphics

The main programobj3dis identical to programplot3d, except that
the data definition module reads:

int vertices;

ifstream file9("obj3d.inp");

nc = 0; // count the number of elements

another:

file9 >> vertices; // number of vertices

if(vertices==0){goto done;}// end of triangles

nc = nc+1;

np[nc]==vertices;

for(int i=1; i<=vertices;i++)

{

file9 >> xd[nc][i] >> yd[nc][i] >> zd[nc][i];

}

goto another; // read again

done: // done reading

file9.close();

cout << nc;

The triangle vertices are recorded in the fileobj3d.inpin the following
format:

3

0.00000 0.00000 0.62573

0.08762 0.00000 0.62272

0.00000 0.17524 0.62272

3

0.08762 0.00000 0.62272

...

3

0.48196 -1.15671 -0.33737

0.57835 -0.96392 -0.33737

0.57174 -1.14349 -0.26681

0

where the three dots denote further element blocks.

The graphics output of the code is shown in Figure 7.8.1.