[matheusbn]

Nice demo! But one note, I don't know about DaggerFall but Duke Nukem 3D does NOT uses Raycasting to draw walls.

DN3D uses sectors (Convex Polygon) to store room's lines (or walls), and draws those lines using player's FOV (Field Of View).

When those sectors are connected with others sectors, it's called portal. This is used to sort only the sectors that is inside the player's FOV.

[thedevopsguy]

Didn't games like Duke Nukem 3d, post-Doom, Wolf games use what was called a scanline algorithm? Drawing the lines in the players FOV as you just stated and then using a clipping algorithm to keep unwanted information out. I think raycasting would be a type of scanline algorithm, but the technique is less primitive since your not using a proper 3d engine. It's a long time since I programmed games like this so am now a bit fuzzy on the specifics.

[hunterloftis]

Thanks for letting me know! It's referenced as a raycaster in several places, and of course the output looks very much like a raycaster's, so I checked up on this.

After a little reading, it sounds like DN3D uses a cousin of a raycaster, as it's still rendering independent columns. Instead of casting rays to find them, it's projecting their vertices. Neat!