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Parameters

Returns

MeshDataArray Returns a MeshDataArray containing writeable MeshData structs. See MeshDataArray and MeshData.

Description

Allocates data structures for Mesh creation using C# Jobs.

using UnityEngine;
using UnityEngine.Rendering;
[RequireComponent(typeof(MeshFilter))]
public class ExampleScript : MonoBehaviour
{
    void Start()
    {
        // Allocate mesh data for one mesh.
        var dataArray = Mesh.AllocateWritableMeshData(1);
        var data = dataArray[0];
        // Tetrahedron vertices with positions and normals.
        // 4 faces with 3 unique vertices in each -- the faces
        // don't share the vertices since normals have to be
        // different for each face.
        data.SetVertexBufferParams(12,
            new VertexAttributeDescriptor(VertexAttribute.Position),
            new VertexAttributeDescriptor(VertexAttribute.Normal, stream:1));
        // Four tetrahedron vertex positions:
        var sqrt075 = Mathf.Sqrt(0.75f);
        var p0 = new Vector3(0,0,0);
        var p1 = new Vector3(1,0,0);
        var p2 = new Vector3(0.5f,0,sqrt075);
        var p3 = new Vector3(0.5f,sqrt075,sqrt075/3);
        // The first vertex buffer data stream is just positions;
        // fill them in.
        var pos = data.GetVertexData<Vector3>();
        pos[0] = p0; pos[1] = p1; pos[2] = p2;
        pos[3] = p0; pos[4] = p2; pos[5] = p3;
        pos[6] = p2; pos[7] = p1; pos[8] = p3;
        pos[9] = p0; pos[10] = p3; pos[11] = p1;
        // Note: normals will be calculated later in RecalculateNormals.
        // Tetrahedron index buffer: 4 triangles, 3 indices per triangle.
        // All vertices are unique so the index buffer is just a
        // 0,1,2,...,11 sequence.
        data.SetIndexBufferParams(12, IndexFormat.UInt16);
        var ib = data.GetIndexData<ushort>();
        for (ushort i = 0; i < ib.Length; ++i)
            ib[i] = i;
        // One sub-mesh with all the indices.
        data.subMeshCount = 1;
        data.SetSubMesh(0, new SubMeshDescriptor(0, ib.Length));
        // Create the mesh and apply data to it:
        var mesh = new Mesh();
        mesh.name = "Tetrahedron";
        Mesh.ApplyAndDisposeWritableMeshData(dataArray, mesh);
        mesh.RecalculateNormals();
        mesh.RecalculateBounds();
        GetComponent<MeshFilter>().mesh = mesh;
    }
}