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Question by neoking_unity · Jul 15, 2018 at 08:12 PM · positioningvertexprefab-instance

Getting vertices of moved and scaled prefab

I want to get array of vertices of instantiated object and then use it as a feed to raycast over vertices of other mesh. Problem is with getting vertices of that instantiated object. Shortened version of my code:

 prefab_PRE = Resources.Load ("prefabs/street") as GameObject;
 current_position = new Vector3 (2 + highlight.posx, highest_mesh_y + 1f, 2 + highlight.posy);
 prefab = GameObject.Instantiate (prefab_PRE,current_position, rotate_q, current_grass.transform) as GameObject;
 mesh = prefab.GetComponent<MeshFilter> ().sharedMesh;
 mesh = (Mesh)Instantiate (mesh);
 prefab.transform.localScale = new Vector3 (0.2f, 0.2f, 0.2f);
 for (int i = 0; i < mesh.vertices.Length; i++) { //For testing
     Debug.DrawRay (mesh.vertices [i], Vector3.down, Color.green, 10);
 }

Apparently, array mesh.vertices is referring to prefab_PRE's vertices, insted of prefab's (as I wanted it to be). I tried making mesh unique with

 mesh = (Mesh)Instantiate (mesh);

but it hasn't worked as I expected. So how can I get to array of prefab's vertices? alt text

Rays represent vertices of my "untransformed" asset 'street.3ds' (prefab_PRE), while prefab is that hovering road :>. Rays should cover only the road and nothing more.

s.png (159.4 kB)
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Answer by neoking_unity · Jul 18, 2018 at 03:24 PM

Finally I got it. Mesh Filters property .vertices relates to local alignment of vertices of original object. Command:

 prefab.GetComponent<MeshFilter>().sharedMesh.vertices 

refers to vertices of original prefab. Moreover:

  prefab.GetComponent<MeshFilter>().Mesh.vertices

means exactly the same. However, if you want to get unique mesh of prefab and operate on it, u need to get its .mesh, not .sharedMesh. If clone has been scaled, every change of vertex must by "back-scaled" so to speak. For example, if copy has been scaled down 5 times, then desired change of position of vertex has to be upscaled 5 times as well. Its strange, but it works. At least for me.

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