I wrote a code like in lesson 10..drawing an object from files such as nodes.txt(includes indexnumber,x,y,z) triangles.txt(includes indexnumber,nodenumber1,node2,node3,edge1,edge2,edge3) edge.txt(includes indexnumber,node1,node2). According to this created a structure such as; struct nodes { int nodeno; float x; float y; float z; } ; struct edges { int edgeno; int node1; int node2; } ; struct triangles { int triangleno; int node1; int node2; int node3; int edge1; int edge2; int edge3; }; struct nodes n[200]; struct edges e[200]; struct triangles t[200]; ........... And then,I used the following for reading from each file. This was the firstfile(nodes.txt) for (int loop1 = 0; loop1 <totalnodes ; loop1++) { readstr(filein1,oneline1); sscanf(oneline1, "%d %f %f %f\n ", &nno, &xx, &yy, &zz); n[loop1].nodeno=nno; n[loop1].x=xx; n[loop1].y=yy; n[loop1].z =zz; } ...... And the following is for drawing.. for (int loop_m = 0; loop_m < totaltri; loop_m++) { glBegin(GL_TRIANGLES); glNormal3f( 0.0f, 0.0f, 0.0f); n1=t[loop_m].node1; n2=t[loop_m].node2; n3=t[loop_m].node3; x_t=n[n1].x; y_t=n[n1].y; z_t=n[n1].z; glVertex3f(x_t,y_t,z_t); glColor3f(0.0f,1.0f,1.0f); x_t=n[n2].x; y_t=n[n2].y; z_t=n[n2].z; glVertex3f(x_t,y_t,z_t); glColor3f(0.0f,1.0f,0.0f); x_t=n[n3].x; y_t=n[n3].y; z_t=n[n3].z; glVertex3f(x_t,y_t,z_t); glColor3f(0.0f,0.0f,1.0f); glEnd(); } The code has no errors but doesnt work... what seems to be wrong?

I did it
it works..