Geometry keeps breaking

Discussion in 'Mapping Questions & Discussion' started by aweaklingchild, Sep 19, 2009.

  1. aweaklingchild

    aweaklingchild L1: Registered

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    I am building a ship hull. I'm using identical brushes and the vertex tool to make the basic shape of the hull. I will get everything neatly aligned and it looks perfect so I save a prefab of the hull. Later, after working on some other part of the map, I notice that the hull's vertices are totally out of whack. I assume this is because of something I did inadvertently (even though they're so out of place that it's hard to image what I could have done, especially since the hull has been hidden as a visgroup the whole time). Luckily I have my prefab with the correct geometry. But no, I place the prefab and it's the same with all the vertices out of whack.

    I continue to have this problem with other parts of my map that I use the vertex tool to manipulate. I'm not doing anything crazy... all the brushes have 4 sides, no merged vertices, etc. Am I missing something basic about the vertex tool or is this some kind of glitch?

    Thanks in advance for the help!


    These are pictures of the broken geometry:

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    [​IMG]
    [​IMG]
     
  2. A Boojum Snark

    aa A Boojum Snark Toraipoddodezain Mazahabado

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    You've made invalid solids. A single brush can never have a face that 'bends'
     
  3. Terr

    aa Terr Cranky Coder

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    To illustrate what ABS means in a more visceral sense:
    • Take a four-corner page or sheet of paper.
    • Put it down on a flat surface like a desk.
    • Lift just one corner/tip up, off the desk, so it is in midair. (Or do it with two corners which are opposite each other.)
    • All the other corners must remain touching the desk. all the rest of the corners still touching the desk.
    • Is the paper itself still flat? Not bent or creased? Is it even possible to have a flat piece of paper with the corners in those positions?
      (Answer: No, it's not possible.)

    Your problem is that you're telling Hammer to make a flat four-corner face but with corners in places that are mathematically impossible. (Note that a three-corner triangle of paper never has this problem.)
     
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    Last edited: Sep 19, 2009