dat@ORVILLE.NAS.NASA.GOV ("David A. Tristram") (04/21/88)
There doesn;t seem to be much in the way of documentation for z-buffer access for 3000 or 4d/60's, however, if its any consolation, the GT has *extensive* access to the z-buffer, including read/write and control of the comparison mode (ALWAYS,<,==,>,<=,>=,!=,NEVER), primitive writemasks (on or off, basically), and when drawing, z-type comparisons may also be made from the regular image planes. How's that for the old 'its fixed in the next version' frustrations? tristram