Hi, i have inserted this type in my code: GLTVector3 but compiler shows the error "undeclared identifier". I have included glut.h, glu.h, gl.h and glaux.h. Original code includes OpenGLSB.h and GLTools.h but i didnt find them in my pc. What are these .h files?

Undeclared identifier means it is not a defined type of variable. You most likely need those headers, but I don't know where you would get them.