Submeshes with LineStrip

Questions & Answers
1

Just a simple test to draw two lines using submeshes and MeshTopology.LineStrip. Only the first one (points {0,1,2} ) gets drawn:

    void Start()
    {            
        List<Vector3> verts = new List<Vector3>();
        verts.Add(new Vector3(-50f, 50f, 0f));
        verts.Add(new Vector3(50f, 50f, 0f));
        verts.Add(new Vector3(50f, -50f, 0f));
        verts.Add(new Vector3(-50f, -50f, 0f));

        Mesh newMesh = new Mesh();
        newMesh.SetVertices(verts);
        newMesh.subMeshCount = 2; 
        newMesh.SetIndices(new int[] { 0, 1, 2 }, MeshTopology.LineStrip, 0);
        newMesh.SetIndices(new int[] { 2, 3, 0 }, MeshTopology.LineStrip, 1);

        GameObject testObject = new GameObject("SubMeshTestObject");
        MeshRenderer renderer = testObject.AddComponent<MeshRenderer>();
        renderer.material = new Material(Shader.Find("Diffuse"));
        MeshFilter filter = testObject.AddComponent<MeshFilter>();
        filter.mesh = newMesh;    
    }

What am I doing wrong?

2

Try this:

public class LineMaker : MonoBehaviour
{

    void Start()
    {
        List<Vector3> verts = new List<Vector3>();
        verts.Add(new Vector3(-50f, 50f, 0f));
        verts.Add(new Vector3(50f, 50f, 0f));
        verts.Add(new Vector3(50f, -50f, 0f));
        verts.Add(new Vector3(-50f, -50f, 0f));

        Material Material1 = new Material(Shader.Find("Diffuse"));
        Material Material2 = new Material(Shader.Find("Diffuse"));
        

        Mesh newMesh = new Mesh();
        newMesh.SetVertices(verts);
        newMesh.subMeshCount = 2;
        newMesh.SetIndices(new int[] { 0, 1, 2 }, MeshTopology.LineStrip, 0);
        newMesh.SetIndices(new int[] { 2, 3, 0 }, MeshTopology.LineStrip, 1);

        GameObject testObject = new GameObject("SubMeshTestObject");
        MeshRenderer renderer = testObject.AddComponent<MeshRenderer>();
        renderer.materials = new Material[] { Material1, Material2 };



        MeshFilter filter = testObject.AddComponent<MeshFilter>();
        filter.mesh = newMesh;
    }
}

Also see:

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