Thanks for all your kind comments, Terri, the chain shader can look good, sometimes ! I gotta say (i've got my pride ;] ) that the chains are not modelled in 3D, they're just textures ! You can see it on this image : some chains are flat because i made this quickly . I'm thinking now that this shader has some limits because if you turn around a chain, it will appear flat . But it doesn't render bad in stills ... Do you have any suggestions for the image ? litst