Getting the world position of mesh vertices?

Question

I have some simple mesh objects in my scene, and I want to obtain the position of each vertex in them. So far, I have the following code to do so.

 MeshFilter mf = cube.GetComponent<MeshFilter>();
 for (int i = 0; i < mf.mesh.vertices.length; i++)
 {
         Vector3 v = mf.mesh.vertices[i];
         ...

The problem is that this only obtains the local position of each vertex according to the unmodified mesh. (i.e., cubes will have vertices at (0.5, 0.5, 0.5), (-0.5, 0.5, 0.5), (-0.5, -0.5, 0.5) etc... no matter where the cube is in the scene.)

Is there any way to obtain the world position of these vertices instead of this useless local position?

Answer 1

Best Answer

Answer by IgorAherne · Jan 27, 2017 at 10:16 AM

Don't be so harsh, they are not useless )

 Matrix 4x4 localToWorld = transform.localToWorldMatrix;
 
 for(int i = 0; i<mf.mesh.vertices.Length; ++i){
       Vector3 world_v = localToWorld.MultiplyPoint3x4(mf.mesh.vertices[i]);
 }

More about matrices here

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CookieSteve · Jan 27, 2017 at 10:32 AM 1

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Works like a charm. Thank you!

douglasdaquino · Apr 03, 2019 at 02:10 AM 1

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you sir, just saved my life! I was going crazy trying to spawn things at vertices positions, now I can do it! Really really appreciate you sharing your knowledge :D

Answer 2

Answer by robert878 · May 29, 2018 at 04:07 PM

Or use Vector3 worldPt = transform.TransformPoint(meshVert);

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naklow12 · Sep 18, 2020 at 07:49 AM 0

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Actually not worked like the comment which is voted for answer.

timebenter · Sep 26, 2021 at 07:24 AM 0

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According to the Unity Documentation, this "Transforms position from local space to world space." So I think this is a better answer.

Transform.TransformPoint

Getting the world position of mesh vertices?

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