CODEWITHSUNDEEP
c#unity-game-enginemodelsize
Ivailo Korakov
Ivailo Korakov

Reputation: 477

Get Size of 3d mesh inside a Prefab in Unity?


I want to create a hexagon grid. I Have a 3D model which I made in blender with some dimensions.
I have a script in Unity which is supposed to generate a hex grid with a given hexagon.
The model of the hex is placed in a Prefab. I need the size "Real size not the scale" of that prefab in order to generate the grid.
How can I get the size of the model which is in a prefab.

public class GameWorld : MonoBehaviour
{
    // Fields
    public GameObject HexPrefab;

    // Size of the map in terms of number of the objects
    // This is not representative of the actual size of the map in units
    public int Width = 20;
    public int Height = 20;

    void Start()
    {
        MeshRenderer[] asd = HexPrefab.GetComponentsInChildren<MeshRenderer>();
        var a = asd[0].bounds;

        Debug.Log(string.Format("x: - {0:f3}", a.size.x));
        Debug.Log(string.Format("y: - {0:f3}", a.size.y));
        Debug.Log(string.Format("z: - {0:f3}", a.size.z));

        for (int x = 0; x < Width; x++)
        {
            for (int y = 0; y < Height; y++)
            {
                Instantiate(HexPrefab, new Vector3(x, 0, y), Quaternion.identity);
            }
        }
    }

    void Update()
    {

    }
}

Here are the dimensions from blender.
enter image description here
I don't want to hard code it because I will need to use hexagons of different sizes in the future!
This code gives me a size of 0. The prefab consists of only one model and nothing else. Thank you in advance!

Upvotes: 1

Views: 5398

Answers (1)

Ivailo Korakov
Ivailo Korakov

Reputation: 477

My Prefab Consists of only the model. Here is what it looks like.
enter image description here
And this is the properties of the model:
enter image description here
Then in the code I did the following:

Mesh mesh = HexPrefab.GetComponentsInChildren<MeshFilter>()[0].sharedMesh;

And now I can get the dimensions of the mesh like this:

mesh.bounds.size

In my case the prefab has a scale of 1 so the size of the model and the size of the prefab are the same but if you want to go the extra step you can multiply the size that we got from the model by the scale of the prefab.
Hope this helps someone who is having the same question!
Have a nice day!

Upvotes: 2

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