I have a question about the obj files. This may be very basic, but I still not very clear, so I ask help again. I knew that poser will smooth the sharp edges of the mesh, and to keep the sharp edges, there must be two edges being very close. This gave me an idea, if I don!|t have the two close edge, I will have a smooth edge, only smooth edges and nothing else. So I made a test. I used max to make a cylinder with 8 sides, and import into poser, I got the result in the picture. The no.1 cylinder is what I have. You can see the dark color near the bottom, it is not inverted normal, or two sided material. I don't give any material to it. And I go back in max, extrude the top and bottom with 0.1. This time, I got the result of no.2. The black color was gone. No.3 in the prop that comes with poser, I put it there as reference. I have the same black color on another obj and ask here before, Phil c and some other friends here giving me many help. I try and try, finally go to the question above. So, I need to add another edge to avoid the black color, even though I don!|t need to keep the sharp edge? It is very annoying that when there is top and bottom, I need to extrude the face. Can someone tell me what should I do?