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The Polygons of Another World: Amiga 500 (fabiensanglard.net)
76 points by atomlib on Jan 3, 2020 | hide | past | favorite | 6 comments



Previous discussion here on yesterday's non Amiga specific post. https://news.ycombinator.com/item?id=21937607


Further, when this was previously submitted, the Amiga 500 page (linked here) existed but the Atari ST page did not. It appears to have been released by the author. Submitter would have done more service by submitting that page.

https://www.fabiensanglard.net/another_world_polygons_atariS...


It's an ongoing series, of course they're going to cover plenty of other platforms.


Not sure about the downvotes. I thought the point was obvious. A day had passed and the newest page had been released. Instead of re-posting the previous page, he could have posted the latest one.


Here's Eric Chahi explaining his decision to use polygons - he mistakenly thought that the Amiga version of Dragon's Lair used them!

https://youtu.be/JFaOYYSxSEA?t=245

Very cool video, wherein Chahi demonstrates his rotoscoping system, where he could use the Amiga's genlock to trace live video in his (extremely impressive) homemade animation/code tool.

The polygons in Another World are a bit different from today's games.

In a modern game, game models would contain fully 3D representations of each model. Each polygon vertice would have X, Y, and Z coords. The CPU/GPU then render these out.

In Another World, the polygons are 2D representations only, like paper cutouts. The animations are precalculated, and then at runtime they basically just need to be blitted out using some of the clever techniques mentioned in the linked article. You wouldn't really be able to alter the animations at runtime or change the perspective, but that was OK - it was a smart compromise to hit Chahi's stated target of about 20fps.

This "2D polygon" approach was a brilliant way to overcome the limitations of CPUs at this time. There were fully 3D polygon games at the time, but they run at a fraction of the frame rate as Another World and contain only a fraction of the detail. The 2D polygon world of Another World felt fluid and real (well, relative to the competition at the time) and some convincing pseudo 3D effects could even be faked.


I just acquired a IBM PS/1, and it's been really fun tinkering with it and learning about it. The next article is about PC-DOS, so I'm looking forward to it.




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