Comment on Which is it Lemmy?

• philipp_@discuss.tchncs.de ⁨3⁩ ⁨days⁩ ago

  Momentum relatively to the source game engine grid.

  source
• Nalivai@lemmy.world ⁨3⁩ ⁨days⁩ ago

  To the space outside of the blue portal. Moving the orange portal doesn’t drag the whole surroundings, so assuming both places are on the same planet, the momentum of the box in relations to both places is the same

  source

  • Snazz@lemmy.world ⁨1⁩ ⁨day⁩ ago

    Moving the orange portal kinda does ‘drag the whole surroundings’. It moves an entire universe.

    The cube is stationary relative to the universe of the platform it’s on, but it has momentum relative to the universe through the portal. The question is which universe is the cube in? What is the boundary of the portal surface?

    source
  • flying_sheep@lemmy.ml ⁨3⁩ ⁨days⁩ ago

    As Optozorax taught us, gravity must act through the portal.

    source

    • Nalivai@lemmy.world ⁨3⁩ ⁨days⁩ ago

      Well, it doesn’t in the only source of knowledge we have: the game Portal. I don’t know enough about gravitational forces to have a coherent theory on it, gravitational waves moving through space-time is a bit beyound my real understanding. But in the game if you put a portal on a ceiling, it doesn’t “suck” you until you’re throuth it, so there it isolates gravity somehow.

      source

      • flying_sheep@lemmy.ml ⁨2⁩ ⁨days⁩ ago

        At this point, I consider Optozorax’ research the primary source of how portals work. If the games disagree, they’re wrong.

        source
      • mkwt@lemmy.world ⁨2⁩ ⁨days⁩ ago

        If you stick to the premise that the portals exist in a universe with GR, then we can pay much know that space-time is locally flat in and around at least the middle parts of the portal. We know this because things don’t get fucked up when they’re going through.

        source