Handles does not modify mesh...

Question

Hello everyone,

I'm trying to make a simple custom editor so I'm able to modify a mesh.

Here's the code:

 [CustomEditor(typeof(MeshFilter))]
 public class MeshEditor : Editor
 {
     private MeshFilter _meshF;
     private Mesh _mesh;
     private GameObject _obj;
 
     private Vector3 meshPos;
 
     void Awake()
     {
         _meshF = (MeshFilter)target;
         _obj = _meshF.gameObject;
         _mesh = _meshF.sharedMesh;
         meshPos = _obj.transform.TransformPoint(_mesh.vertices[0]);
     }
 
     void OnSceneGUI()
     {
         Handles.Label(_obj.transform.position + Vector3.up * 2, "Verts: " + _mesh.vertexCount + " Tris: " + _mesh.triangles.Length);
 
         //for (var i = 0; i < mesh.vertexCount; i++)
         //{
         //    mesh.vertices[i] = Handles.PositionHandle(obj.transform.TransformPoint(mesh.vertices[i]), Quaternion.identity);
         //}
 
         meshPos = Handles.PositionHandle(meshPos, Quaternion.identity);
 
         if (GUI.changed)
         {
             _mesh.vertices[0] = meshPos;
             EditorUtility.SetDirty(target);
         }
     }
 }

I can move the handle but the mesh is not changing... any ideas?

Thanks

Answer 1

Best Answer

Answer by Aram-Azhari · Jun 22, 2014 at 06:16 AM

I have asked the exact question in the forums. My answer according to Here:

Update the whole vertex array instead just updating an element of it.

So add

 private Vector3[] _verts;

In Awake() add:

 _verts = _mesh.vertices;

And in OnSceneGUI() modify the line:

 _mesh.vertices[0] = meshPos;

to

 _verts[0] = meshPos;
 _mesh.vertices = verts;

:)

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dorpeleg · Jun 22, 2014 at 08:28 AM 0

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Thanks! works like a charm.

I'm having another issue tho, maybe you can help me.

It seems that the vert positions are effected by my objects position in a weird way.

If the object's position is at (0,0,0) then it works perfectly, but but if the position is different, the mesh jumps off as soon as i move any of the handles.

Any ideas?

AlucardJay · Jun 22, 2014 at 01:54 PM 2

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You'll need to use Transform.TransformPoint and Transform.InverseTransformPoint to find the vertex position in world space, modify it, then convert back to local space

dorpeleg · Jun 25, 2014 at 09:30 AM 0

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Thanks @alucardj.

I've managed to solve both position and scaling issues I had.

But now I'm facing an issue that is beyond my math skills.

It is basically the same issue like in position and scale.

If the value is not 0, the vertices are being added the value.

For example: if my starting rotation is 45, my object jumps so its now 90.

So I need to somehow inverse the rotation, but quaternions is something I'm clueless about.

Any help will be appreciated.

dorpeleg · Jun 25, 2014 at 12:47 PM 0

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@alucardj, looks like InverseTransformPoint fixes the rotation too.

I solved it differently before seeing your answer, but then decided to check your suggestion.

from me :)

Handles does not modify mesh...

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