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void gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar);
void gluLookAt(GLfloat eyex, GLfloat eyey, GLfloat eyez,
GLfloat centerx, GLfloat centery, GLfloat centerz,
GLfloat upx, GLfloat upy, GLfloat upz);
int gluUnProject(GLfloat winx, GLfloat winy, GLfloat winz,
const GLfloat modelMatrix[16],
const GLfloat projMatrix[16],
const GLint viewport[4],
GLfloat * objx, GLfloat * objy, GLfloat * objz);