Mesh collider on procedurally generated mesh


I'm having a problem assigning my mesh a collider.

I've tweaked the CrumpleMesh scene (from the procedural examples package) and now have a flat plane that, on run time, is deformed by Perlin noise. I can assign the mesh itself a collider but this does not follow the contours of the deformed mesh (e.g. the hills and troughs).

So- in light of the above, what would be the best way of assigning a collider to my mesh after it has been deformed (I imagine I need to add something to the script, but can't quite work out what).

FYI, I'm using the C# version of the script:

using UnityEngine;
using System.Collections;
using Graphics.Tools.Noise;
using Graphics.Tools.Noise.Primitive;
using Graphics.Tools.Noise.Filter;

public class CrumpleMesh : MonoBehaviour {

    public float scale = 1f;
    public float speed = 0f;
    public bool recalculateNormals = false;

    private Vector3[] _baseVertices;
    private IModule3D _noise;

    private Mesh _mesh;
    static private System.Random _rnd = new System.Random(999);

    /// <summary>
    /// </summary>
    void Start () {
       _mesh = GetComponent<MeshFilter>().mesh;
    }//end Start

    /// <summary>
    /// </summary>
    void Update () {

       if (_noise == null){
       }//end if

       if (_baseVertices == null){
         _baseVertices = _mesh.vertices;
       }//end if

       Vector3[] vertices = new Vector3[_baseVertices.Length];

       float timex = Time.time * speed + 1.2584f;
       float timey = Time.time * speed + 40.6584f;
       float timez = Time.time * speed + 1.6518f;

       for (int i = 0; i < vertices.Length; i++){

         Vector3 vertex = _baseVertices[i];

         vertex.x += _noise.GetValue(timex + vertex.x, timex + vertex.y, timex + vertex.z) * scale;
         vertex.y += _noise.GetValue(timey + vertex.x, timey + vertex.y, timey + vertex.z) * scale;
         vertex.z += _noise.GetValue(timez + vertex.x, timez + vertex.y, timez + vertex.z) * scale;

         vertices[i] = vertex;

       }//end for

       _mesh.vertices = vertices;

       }//end if


    }//end Update

    /// <summary>
    /// </summary>
    private void CreatePrimitive(){

       SimplexPerlin primitive = new SimplexPerlin();
       primitive.Seed = (int)(_rnd.Next() * _rnd.Next());

       SinFractal filter = new SinFractal();
       filter.OctaveCount = 10f;
       filter.Primitive3D = primitive;

       _noise = primitive;

    }//end CreatePrimitive

}//end class

Thank you for any responses.

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asked Dec 14 '11 at 11:41 PM

sam.ibbitson gravatar image

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1 answer: sort voted first

Copy the generated mesh to the meshcollider's mesh. i.e., GetComponent<MeshCollider>().mesh = _mesh;. Keep in mind that updating a mesh collider is very slow, and not actually something you want to do in Update.

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answered Dec 15 '11 at 12:13 AM

Eric5h5 gravatar image

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This is what I was looking for- thanks!

Dec 18 '11 at 10:31 AM sam.ibbitson
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asked: Dec 14 '11 at 11:41 PM

Seen: 2774 times

Last Updated: Dec 18 '11 at 10:31 AM