• @[email protected]
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    310 months ago

    IMO, floats model real observations.

    And since there is no precision in nature, there shouldn’t be precision in floats either.

    So their odd behavior is actually entirely justified. This is why I can accept them.

    • @[email protected]
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      210 months ago

      I just gave up fighting. There is no system that is going to both fast and infinitely precision.

      So long ago I worked in a game middleware company. One of the most common problems was skinning in local space vs global space. We kept having customers try and have global skinning and massive worlds, then upset by geometry distortion when miles away from the origin.

      • @[email protected]
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        110 months ago

        How do y’all solve that, out of curiosity?

        I’m a hobbyist game dev and when I was playing with large map generation I ended up breaking the world into a hierarchy of map sections. Tiles in a chunk were locally mapped using floats within comfortable boundaries. But when addressing portions of the map, my global coordinates included the chunk coords as an extra pair.

        So an object’s location in the 2D world map might be ((122, 45), (12.522, 66.992)), where the first elements are the map chunk location and the last two are the precise “offset” coordinates within that chunk.

        It wasn’t the most elegant to work with, but I was still able to generate an essentially limitless map without floating point errors poking holes in my tiling.

        I’ve always been curious how that gets done in real game dev though. if you don’t mind sharing, I’d love to learn!

        • @[email protected]
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          210 months ago

          That’s pretty neat. Game streaming isn’t that different. It basically loads the adjacent scene blocks ready for you to wonder in that direction. Some load in LOD (Level Of Detail) versions of the scene blocks so you can see into the distance. The further away, the lower the LOD of course. Also, you shouldn’t really keep the same origin, or you will hit the distort geometry issue. Have the origin as the centre of tha current block.