コード例 #1
0
    static VertsTris Subdivide(VertsTris orig)
    {
        var result = new VertsTris();

        for (int i = 0; i < orig.tris.Count; i += 3)
        {
            var v1 = orig.verts[orig.tris[i + 0]];
            var v2 = orig.verts[orig.tris[i + 1]];
            var v3 = orig.verts[orig.tris[i + 2]];

            // replace triangle by 4 triangles
            var a = Vector3.Normalize((v1 + v2) / 2f);
            var b = Vector3.Normalize((v2 + v3) / 2f);
            var c = Vector3.Normalize((v3 + v1) / 2f);

            result.AddTriangle(v1, a, c);
            result.AddTriangle(v2, b, a);
            result.AddTriangle(v3, c, b);
            result.AddTriangle(a, b, c);
        }
        return(result);
    }
コード例 #2
0
    public static Mesh Generate(int subdivisions = 0)
    {
        var t = (1.0f + Mathf.Sqrt(5.0f)) / 2.0f;

        var icosahedron = new VertsTris {
            // 12 vertices of a icosahedron
            verts = new List <Vector3> {
                new Vector3(-1, t, 0).normalized,
                new Vector3(1, t, 0).normalized,
                new Vector3(-1, -t, 0).normalized,
                new Vector3(1, -t, 0).normalized,

                new Vector3(0, -1, t).normalized,
                new Vector3(0, 1, t).normalized,
                new Vector3(0, -1, -t).normalized,
                new Vector3(0, 1, -t).normalized,

                new Vector3(t, 0, -1).normalized,
                new Vector3(t, 0, 1).normalized,
                new Vector3(-t, 0, -1).normalized,
                new Vector3(-t, 0, 1).normalized
            },

            // 20 triangles of the icosahedron
            tris = new List <int> {
                // 5 faces around point 0
                0, 11, 5,
                0, 5, 1,
                0, 1, 7,
                0, 7, 10,
                0, 10, 11,

                // 5 adjacent faces
                1, 5, 9,
                5, 11, 4,
                11, 10, 2,
                10, 7, 6,
                7, 1, 8,

                // 5 faces around point 3
                3, 9, 4,
                3, 4, 2,
                3, 2, 6,
                3, 6, 8,
                3, 8, 9,

                // 5 adjacent faces
                4, 9, 5,
                2, 4, 11,
                6, 2, 10,
                8, 6, 7,
                9, 8, 1
            }
        };

        // refine triangles
        for (int i = 0; i < subdivisions; i++)
        {
            icosahedron = Subdivide(icosahedron);
        }

        // Convert into a Unity mesh.
        var mesh = new Mesh();

        mesh.SetVertices(icosahedron.verts);
        mesh.SetTriangles(icosahedron.tris, 0);
        return(mesh);
    }