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Mesh vertices change object center

Discussion in 'World Building' started by FuturePilot1701, Jul 31, 2019.

  1. FuturePilot1701

    FuturePilot1701

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    Jul 31, 2019
    Posts:
    8
    I am trying to generate a sphere of any size and add noise to the surface. I got to the point where I can generate the sphere shape, then apply a mesh and a material with the noise texture on it. However, given the way I generate the noise, the noise changes based on the location of the object that has the generation script attached. So I simply moved the object away from 0, 0, 0, and then when I clicked play, the object generated the circle off center, and appeared to change the center of the object from where it was. So I created a new script to go through the whole process step by step again. And I found that everything was good until I write "mesh.vertices = vertices" (vertices being my list of vertices. If I run the program with this line included it moves the center of the object down and to the right. Is the a normal thing when applying mesh vertices?

    Before:

    before.PNG

    After: after.PNG

    Literally all I did to have this happen was un-comment the line "mesh.vertices = vertices"
     
  2. JoeStrout

    JoeStrout

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    Jan 14, 2011
    Posts:
    9,443
    Well if you don't do "mesh.vertices = vertices" then you aren't doing anything at all. You're just building an array and throwing it away.

    So yes, it's normal that when you assign new vertices to a mesh, the mesh changes. ;)
     
  3. FuturePilot1701

    FuturePilot1701

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    Jul 31, 2019
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    but why did the center point of the entire object change?
     
  4. JoeStrout

    JoeStrout

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    Because, apparently, your mesh vertices are not centered around 0,0,0.

    (Keep in mind that vertex positions are always given in local coordinates.)
     
  5. FuturePilot1701

    FuturePilot1701

    Joined:
    Jul 31, 2019
    Posts:
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    the vertices arent centered around the obejcts 0,0,0?
     
  6. JoeStrout

    JoeStrout

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    Yep. So it appears. (Of course since you haven't shown us the code that generates the vertices, we can only speculate from the symptoms you've described.)
     
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