djennin@RELAY.NSWC.NAVY.MIL (09/28/90)
In reference to Issue 11 in the IRIS Universe, in the article 'The Hidden Charms of Z-Buffer', pp. 34 - 37, a person in my group is having difficulty implementing the hollow polygon algorithm. It appears that the entire sphere is always visible, instead of what is shown in Figures 5 and 6. She is using RGB mode, with the z comparison reversed (as discussed on p. 32, i.e., 'lsetdepth(0x7fffff, 0x000000)'), and Gouraud (default) shading. Has anyone successfully implemented this, and if so, what does your initialization look like (are we just forgetting to set some parameter)? We have tried several ways to get this to work, but it always appears the same. Thanks. David Jennings Naval Surface Warfare Center djennin@relay.nswc.navy.mil