glPerspective or glLookAt

OpenGL OpenGL: Basic Coding
1

I have large 3d cube that I created and on the screen it looks like 3d wire frame cube. I have also created little cube inside of the bigt cube and little cube was created by call

glutSolidCube(50);

but little cube looks flat (doesnt look like 3d). It looks just like square drawn on the screen. I am confused on using glPerspective or glLookAt and where these 2 should be placed inside the program.

2

Do you mean gluPerspective and gluLookAt?

If so, gluPerspective sets up your projection matrix, the matrix that will be applied to all vertices projecting onto the screen. gluPerpective creates a view frustrum.

gluLookAt sets up your camera. Where the camera is and to where the camera is pointing as well as the orientation.

gluPerpective
gluLookAt