纹理 UV 坐标在 Unity3D 中未按预期排列答案

【问题标题】：Texture UV coords not lining up as expected in Unity3D纹理 UV 坐标在 Unity3D 中未按预期排列
【发布时间】：2016-06-11 21:17:48
【问题描述】：

我正在 Unity3D 中以编程方式创建网格。网格的每个部分都设置了 4 个顶点：

// 1 ----- 2 
// | a  /  |
// |  /  b |
// 3 ----- 4

我的 UV 是：

1 = 0, 1
2 = 0.125, 1
3 = 0, 0.875
4 = 0.125, 0.875

我的纹理是 2048x2048。该图块位于图像的左上角，大小为 256x256。我用一些额外的图块稍微更新了纹理，以便更好地了解我正在尝试做什么。

我在网格上的每个图块周围都出现了白色边缘。

我正在使用以下设置导入图像。

生成网格的代码（手动法线）：

IEnumerator BuildMesh (int width, int height, float tileSize) {

    float halfSize = tileSize / 2f;

    List<Vector3> vertices = new List<Vector3> ();
    List<Vector3> normals = new List<Vector3> ();
    List<Vector2> uv = new List<Vector2> ();
    List<int> triangles = new List<int> ();

    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            int tileVertIdx = vertices.Count;

            float h = map.GetHeight(startX + x, startY + y);
            float n = map.GetHeight(startX + x, startY + y - 1);
            float s = map.GetHeight(startX + x, startY + y + 1);
            float e = map.GetHeight(startX + x + 1, startY + y);
            float w = map.GetHeight(startX + x - 1, startY + y);
            float ne = map.GetHeight(startX + x + 1, startY + y - 1);
            float nw = map.GetHeight(startX + x - 1, startY + y - 1);
            float se = map.GetHeight(startX + x + 1, startY + y + 1);
            float sw = map.GetHeight(startX + x - 1, startY + y + 1);

            Vector3 tileCenter = new Vector3 (x * tileSize, h, y * tileSize);
            Rect topUV = map.GetTopUV ((int)h);

            if (n == h && s == h && e == h && w == h && ne == h && nw == h && se == h && sw == h) {
                // Each tile
                // 1 ----- 2 
                // | a  /  |
                // |  /  b |
                // 3 ----- 4

                // top row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z - halfSize));

                // bottom row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z + halfSize));

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                uv.Add (new Vector2(topUV.x, topUV.y));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y));

                uv.Add (new Vector2(topUV.x, topUV.y - topUV.height));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y - topUV.height));

                // a
                triangles.Add (tileVertIdx + 0);
                triangles.Add (tileVertIdx + 2);
                triangles.Add (tileVertIdx + 1);

                // b
                triangles.Add (tileVertIdx + 1);
                triangles.Add (tileVertIdx + 2);
                triangles.Add (tileVertIdx + 3);
            } else {
                // Each tile
                // 1 - 2 - 3 14 --- 16
                // |a\b|c/d\ |  k / |
                // 4 - 5 - 6 |   /  |
                // |e/f|g\h| |  / l |
                // 7 - 8 - 9 15 --- 17
                // 10 --- 11
                // | i / j |
                // 12 --- 13

                // top row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x, tileCenter.y, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z - halfSize));

                // middle row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z));
                vertices.Add (new Vector3 (tileCenter.x, tileCenter.y, tileCenter.z));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z));

                // bottom row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x, tileCenter.y, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z + halfSize));

                // bottom square
                vertices.Add (new Vector3 (tileCenter.x - halfSize, h, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, h, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x - halfSize, s, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, s, tileCenter.z + halfSize));

                // right square
                vertices.Add (new Vector3 (tileCenter.x + halfSize, h, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, h, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, e, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, e, tileCenter.z - halfSize));

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);
                normals.Add (Vector3.up);

                uv.Add (new Vector2(topUV.x, topUV.y));
                uv.Add (new Vector2(topUV.x - (topUV.width / 2), topUV.y));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y));

                uv.Add (new Vector2(topUV.x, topUV.y - (topUV.height / 2)));
                uv.Add (new Vector2(topUV.x - (topUV.width / 2), topUV.y - (topUV.height / 2)));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y - (topUV.height / 2)));

                uv.Add (new Vector2(topUV.x, topUV.y - topUV.height));
                uv.Add (new Vector2(topUV.x - (topUV.width / 2), topUV.y - topUV.height));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y - topUV.height));

                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);

                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);

                // a
                triangles.Add (tileVertIdx + 0);
                triangles.Add (tileVertIdx + 3);
                triangles.Add (tileVertIdx + 4);

                // b
                triangles.Add (tileVertIdx + 0);
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 1);

                // c
                triangles.Add (tileVertIdx + 1);
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 2);

                // d
                triangles.Add (tileVertIdx + 2);
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 5);

                // e
                triangles.Add (tileVertIdx + 3);
                triangles.Add (tileVertIdx + 6);
                triangles.Add (tileVertIdx + 4);

                // f
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 6);
                triangles.Add (tileVertIdx + 7);

                // g
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 7);
                triangles.Add (tileVertIdx + 8);

                // h
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 8);
                triangles.Add (tileVertIdx + 5);

                // i
                triangles.Add (tileVertIdx + 9);
                triangles.Add (tileVertIdx + 11);
                triangles.Add (tileVertIdx + 10);

                // j
                triangles.Add (tileVertIdx + 10);
                triangles.Add (tileVertIdx + 11);
                triangles.Add (tileVertIdx + 12);

                // k
                triangles.Add (tileVertIdx + 13);
                triangles.Add (tileVertIdx + 15);
                triangles.Add (tileVertIdx + 14);

                // l
                triangles.Add (tileVertIdx + 15);
                triangles.Add (tileVertIdx + 16);
                triangles.Add (tileVertIdx + 14);
            }
        }
        yield return null;
    }

    Mesh mesh = _meshFilter.mesh;
    mesh.vertices = vertices.ToArray ();
    mesh.triangles = triangles.ToArray ();
    mesh.normals = normals.ToArray ();
    mesh.uv = uv.ToArray ();
//  mesh.RecalculateNormals ();
//  mesh.Optimize ();
    map.ChunkFinished ();
}

生成网格的代码（自动法线）：

IEnumerator BuildMesh (int width, int height, float tileSize) {

    float halfSize = tileSize / 2f;

    List<Vector3> vertices = new List<Vector3> ();
    List<Vector3> normals = new List<Vector3> ();
    List<Vector2> uv = new List<Vector2> ();
    List<int> triangles = new List<int> ();

    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            int tileVertIdx = vertices.Count;

            float h = map.GetHeight(startX + x, startY + y);
            float n = map.GetHeight(startX + x, startY + y - 1);
            float s = map.GetHeight(startX + x, startY + y + 1);
            float e = map.GetHeight(startX + x + 1, startY + y);
            float w = map.GetHeight(startX + x - 1, startY + y);
            float ne = map.GetHeight(startX + x + 1, startY + y - 1);
            float nw = map.GetHeight(startX + x - 1, startY + y - 1);
            float se = map.GetHeight(startX + x + 1, startY + y + 1);
            float sw = map.GetHeight(startX + x - 1, startY + y + 1);

            Vector3 tileCenter = new Vector3 (x * tileSize, h, y * tileSize);
            Rect topUV = map.GetTopUV ((int)h);

            if (n == h && s == h && e == h && w == h && ne == h && nw == h && se == h && sw == h) {
                // Each tile
                // 1 ----- 2 
                // | a  /  |
                // |  /  b |
                // 3 ----- 4

                // top row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z - halfSize));

                // bottom row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z + halfSize));

                uv.Add (new Vector2(topUV.x, topUV.y));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y));

                uv.Add (new Vector2(topUV.x, topUV.y - topUV.height));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y - topUV.height));

                // a
                triangles.Add (tileVertIdx + 0);
                triangles.Add (tileVertIdx + 2);
                triangles.Add (tileVertIdx + 1);

                // b
                triangles.Add (tileVertIdx + 1);
                triangles.Add (tileVertIdx + 2);
                triangles.Add (tileVertIdx + 3);
            } else {
                // Each tile
                // 1 - 2 - 3 14 --- 16
                // |a\b|c/d\ |  k / |
                // 4 - 5 - 6 |   /  |
                // |e/f|g\h| |  / l |
                // 7 - 8 - 9 15 --- 17
                // 10 --- 11
                // | i / j |
                // 12 --- 13

                // top row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x, tileCenter.y, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z - halfSize));

                // middle row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z));
                vertices.Add (new Vector3 (tileCenter.x, tileCenter.y, tileCenter.z));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z));

                // bottom row
                vertices.Add (new Vector3 (tileCenter.x - halfSize, tileCenter.y, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x, tileCenter.y, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, tileCenter.y, tileCenter.z + halfSize));

                // bottom square
                vertices.Add (new Vector3 (tileCenter.x - halfSize, h, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, h, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x - halfSize, s, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, s, tileCenter.z + halfSize));

                // right square
                vertices.Add (new Vector3 (tileCenter.x + halfSize, h, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, h, tileCenter.z - halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, e, tileCenter.z + halfSize));
                vertices.Add (new Vector3 (tileCenter.x + halfSize, e, tileCenter.z - halfSize));

                uv.Add (new Vector2(topUV.x, topUV.y));
                uv.Add (new Vector2(topUV.x - (topUV.width / 2), topUV.y));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y));

                uv.Add (new Vector2(topUV.x, topUV.y - (topUV.height / 2)));
                uv.Add (new Vector2(topUV.x - (topUV.width / 2), topUV.y - (topUV.height / 2)));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y - (topUV.height / 2)));

                uv.Add (new Vector2(topUV.x, topUV.y - topUV.height));
                uv.Add (new Vector2(topUV.x - (topUV.width / 2), topUV.y - topUV.height));
                uv.Add (new Vector2(topUV.x - topUV.width, topUV.y - topUV.height));

                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);

                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);
                uv.Add (Vector2.up);

                // a
                triangles.Add (tileVertIdx + 0);
                triangles.Add (tileVertIdx + 3);
                triangles.Add (tileVertIdx + 4);

                // b
                triangles.Add (tileVertIdx + 0);
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 1);

                // c
                triangles.Add (tileVertIdx + 1);
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 2);

                // d
                triangles.Add (tileVertIdx + 2);
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 5);

                // e
                triangles.Add (tileVertIdx + 3);
                triangles.Add (tileVertIdx + 6);
                triangles.Add (tileVertIdx + 4);

                // f
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 6);
                triangles.Add (tileVertIdx + 7);

                // g
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 7);
                triangles.Add (tileVertIdx + 8);

                // h
                triangles.Add (tileVertIdx + 4);
                triangles.Add (tileVertIdx + 8);
                triangles.Add (tileVertIdx + 5);

                // i
                triangles.Add (tileVertIdx + 9);
                triangles.Add (tileVertIdx + 11);
                triangles.Add (tileVertIdx + 10);

                // j
                triangles.Add (tileVertIdx + 10);
                triangles.Add (tileVertIdx + 11);
                triangles.Add (tileVertIdx + 12);

                // k
                triangles.Add (tileVertIdx + 13);
                triangles.Add (tileVertIdx + 15);
                triangles.Add (tileVertIdx + 14);

                // l
                triangles.Add (tileVertIdx + 15);
                triangles.Add (tileVertIdx + 16);
                triangles.Add (tileVertIdx + 14);
            }
        }
        yield return null;
    }

    Mesh mesh = _meshFilter.mesh;
    mesh.vertices = vertices.ToArray ();
    mesh.triangles = triangles.ToArray ();
    mesh.uv = uv.ToArray ();
    mesh.RecalculateNormals ();
    mesh.Optimize ();

    map.ChunkFinished ();
}

两个版本的代码产生相同的问题。

【问题讨论】：

.125 业务怎么了？它不会只是 1,1 等等 .. 都是 1/0 吗？？
@JoeBlow - 它不是完整的图像大小。目前我只有 1 块瓷砖，但还会有更多，草、泥土、水等。我现在只是想让纹理正确排列。
好的 - 只是一个建议：只需制作一个统一的普通四边形（即使用菜单）。把你的纹理放在上面。愚弄这些价值观，直到它们如你所愿。绝对检查它在 UNITY 提供的网格上看起来是否正确！
我正在尝试在单个网格上制作平铺地图。网格不仅仅是一个平面，所以我不能使用提供的网格。如果有帮助，我会发布我的代码。
你用谷歌搜索过这些蹩脚的想法吗？ forum.unity3d.com/threads/…

标签： unity3d textures uv-mapping

【解决方案1】：

老兄，你正常吗？

他们应该都直指这个求职者吧？

如果您使用一些默认的法线计算，是不是他们试图轻轻包裹边缘，认为它是一个立方体？

【讨论】：

我已经尝试了两种方式，一切都指向上方并使用RecalculateNormals中的构建
哦，不要使用重新计算。法线。你1000%确定你的法线是正确的？？
您是否完全确定它对您不起作用并独自执行RecalculateStupidNormals？在某些情况下，它会自动“有用地”为您做到这一点。让人抓狂
我 99% 确定这是你的常态。测试：只需放大非常近，看看 Unity 是否试图使它成为一个很好的平滑边缘。使用调试或实际的最终法线打印出来（不要相信您按照自己的意愿设置它们）

【解决方案2】：

尝试将格式设置为真彩色。可能是由于压缩，不同纹理之间的边界不再清晰而是模糊，导致它们相互渗透。

【讨论】：

【解决方案3】：

我也有类似的问题没有过滤器（点）不是真的没有过滤器没有过滤器后面有一个最近邻统一内置过滤器

为解决您的问题，您必须将纹理拆分为 4 个拆分纹理通过这种方式创建 4 个新的 texture2D() 通过获取像素方法将原始纹理的所有像素存储到二维数组中 https://docs.unity3d.com/ScriptReference/Texture2D.GetPixel.html 并创建 4 个新纹理并使用使用 4 for 循环获取原始纹理像素的四分之一并将像素设置为目标纹理之一 https://docs.unity3d.com/ScriptReference/Texture2D.SetPixel.html https://docs.unity3d.com/ScriptReference/Texture2D.SetPixel.html

【讨论】：