how to show the section plane of a 3D-object

OpenGL OpenGL: Advanced Coding
1

i want to show the section plane of a 3D object.
I set LookAt(0.0,0.0,8.0,0.0,0.0,0.0,0.0,1.0,0.0).
at the same time i use glClipPlane(GL_CLIP_PLANE1,eq); the eq={0.0,0.0,1.0,0.0}.but the back half is cut off. maybe it function glClipPlane cann’t do what i want.
So how to show the section plane of a object? i think other method should be used

2

You have already ased this question in the begginers forum: here

Please don’t cross post!