Hello, I need urgent help. I have extracted medial axis of intestine model. Now I need view the inside of the intestine. I have a number of points which form the path. Now for camera I choose the first point of the path and second point as the center for gluLookAt function. But I cannot see any thing, I only see black background. How can I view the inside of my model. Please help me. I have attached picture of both the model and the traverse path. I have showed the camera and center position. Thanks in advance.