Unity: How do I get the coordinates of the vertices of a blender mesh?

Question

I have gameobjects in my scene called icospheres that I have made in Blender, and I am trying to get the coordinates of their vertices. Below is an image of my scene; each triangle is a separate gameobject, blender mesh and is called an icosphere:

Here is the code I am using:

 var meshFilter = icosphere.GetComponent<MeshFilter>(); var vertices = meshFilter.mesh.vertices; GameObject.Find("Fauna Manager").GetComponent<FaunaManager>().PlaceFauna(tree, vertices[0], icosphere); GameObject.Find("Fauna Manager").GetComponent<FaunaManager>().PlaceFauna(tree, vertices[1], icosphere); GameObject.Find("Fauna Manager").GetComponent<FaunaManager>().PlaceFauna(tree, vertices[2], icosphere);

The bottom 3 lines of code call a function that should in theory place another gameobject on top of the 3 coordinates that have been calculated above, however this does not happen. The tree-placing functions work completely and have been tested so the problem is definitely with the coordinates. I printed out the coordinates and the length of the array that holds them. The array is of length 3 as it should be however the coordinates are completely off. The trees have been placed a long way away from the icosphere which means the coordinates are clearly wrong. Where have I gone wrong?

example of coordinates: -0.1, 0.0, -0.1 centre of icosphere for reference: -0.7431812, 0.4044746, -4.932096

Above you can see that the coordinates are well off

Did you remember to take into account the position/scale/rotation of the mesh object? — DMGregory
– DMGregory ♦, Commented Jan 27, 2019 at 18:54
@DMGregory no I didn’t, how can I edit my code to include this? — Finn Williams
– Finn Williams, Commented Jan 27, 2019 at 18:59

DMGregory · Accepted Answer · 2019-01-27 19:02:21Z

It looks like you might not be transforming the vertices by the transformation of the object in the scene.

Vector3 worldPoint = icosphere.transform.TransformPoint(localPoint);

The vertices of a mesh are stored in object-local space. So you need to transform them through to world space if you want objects under a different parent to line up.

Alternatively, you can parent your trees to the mesh object and set their localPosition instead.

What is the variable localPoint in my case? Is it vertices? Because it doesn’t like the fact that one is Vector3 and the other is Vector3[] — Finn Williams
– Finn Williams, Commented Jan 27, 2019 at 19:06

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