m3D – Ex­ten­sion of plain Meta­Post for 3D graph­ics

M3D is an­other ex­ten­sion of plain Meta­Post for 3 di­men­sional graph­ics. While the au­thor claims it should not be re­garded as sta­ble, he be­lieves it has value sim­ply as a source of ideas for those who wish to im­ple­ment 3D graph­ics in Meta­Post.
The pack­age (sta­ble or not) ex­hibits some in­ter­est­ing abil­i­ties, both in the pack­age man­ual and in the gallery that comes with the dis­tri­bu­tion.