c# - 如何在 Unity 2018.1 中使用超过 64k 个顶点的网格

Question

听说 Unity 现在支持 32 位索引缓冲区了。但是当我尝试 Unity 2018.1 时，我无法让它工作。

我用这样的代码构建了网格:

    int nVertices = nx * ny;
    Vector3[] vertices = new Vector3[nVertices];
    Color[] colors = new Color[nVertices];
    for(int i = 0; i < nx; i++) {
        float x = i * w / (nx - 1);
        for (int j = 0; j < ny; j++) {
            float y = j * h / (ny - 1);
            int vindex = i * ny + j;
            vertices[vindex] = new Vector3(x, y, 0);
            float colorx = Mathf.Sin(x) / 2 + 0.5f;
            float colory = Mathf.Cos(y) / 2 + 0.5f;
            colors[vindex] = new Color(0, 0, 0, colorx * colory);
        }
    }
    List<int> triangles = new List<int>();
    for (int i = 1; i < nx; i++) {
        for (int j = 1; j < ny; j++) {
            int vindex1 = (i - 1) * ny + (j - 1);
            int vindex2 = (i - 1) * ny + j;
            int vindex3 = i * ny + (j - 1);
            int vindex4 = i * ny + j;
            triangles.Add(vindex1);
            triangles.Add(vindex2);
            triangles.Add(vindex3);
            triangles.Add(vindex4);
            triangles.Add(vindex3);
            triangles.Add(vindex2);
        }
    }
    Mesh mesh = new Mesh();
    mesh.SetVertices(vertices.ToList<Vector3>());
    mesh.SetIndices(triangles.ToArray(), MeshTopology.Triangles, 0);
    mesh.SetColors(colors.ToList<Color>());

我的着色器根据顶点颜色的 alpha 值绘制彩虹图案。

256 x 256 网格还可以，但 512 x 512 网格只显示其 1/4 的面积和许多错误的三角形。

Answer 1

网格缓冲区默认为 16 位。参见 Mesh-indexFormat :

Index buffer can either be 16 bit (supports up to 65535 vertices in a mesh), or 32 bit (supports up to 4 billion vertices). Default index format is 16 bit, since that takes less memory and bandwidth.

无需仔细查看其余代码，我确实注意到您没有设置 32 位缓冲区。尝试:

mesh.indexFormat = UnityEngine.Rendering.IndexFormat.UInt32;