How to show an object convex hull?

Questions & Answers
1

Hi, everybody!

I have a problem…

In my project, I need to show the object convex hull in Unity running time, as shown in image 1.

But I just get the “normal” mesh, like in image 2. (These are figures from Editor Mode, as you can note. But this is what I see in Running Time Mode too).

This is my code:

public void OnRenderObject()
    {  
		MeshFilter filter = null;
		MeshCollider collider = null;
		Mesh mesh = null;
		
		if( Camera.current.cullingMask ==  ~(1 << LayerMask.NameToLayer("CameraSensorHiddenLayer")) )
			return;		
		
		if (_renderOpt == option._MeshCollider)
		{
			collider = GetComponent<MeshCollider>();
			if( collider == null )
				return;
			mesh = collider.sharedMesh;
		}
		
		else if(_renderOpt == option._FilterCollider)
		{
			filter = GetComponent<MeshFilter>();
			if( filter == null )
				return;
			mesh = filter.sharedMesh;
		}
	
		if( mesh == null )
			return;
	
        Vector3[] vertices = mesh.vertices;
        int[] triangles = mesh.triangles;		
	
        LineMaterial.SetPass(0);
       
        GL.PushMatrix();
        GL.MultMatrix(transform.localToWorldMatrix);
        GL.Begin(GL.LINES);
        GL.Color(LineColor);			
       		
        for (int i = 0; i < triangles.Length/3; i++)			
        {
            int j = i*3;
            GL.Vertex( vertices[triangles[j]] );
            GL.Vertex( vertices[triangles[j+1]] );
        }		
	                 
        GL.End();
        GL.PopMatrix();
    }

I can’t figure out what I’m doing wrong.

Thanks and sorry for my bad english.

2

The convex collider mesh is constructed internally, I don’t believe it is possible to access it from the outside. meshCollider.sharedMesh only points to the original mesh.