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好吧，我正在创建一个类似于地形的东西 - 就像我的世界被分成区域一样。我的问题很简单，有些人脸没有显示，6x6 区域的顶部和右侧部分没有显示。

我想知道是否有人可以检查我的代码以查看我做错了什么，这是函数：

    public void BuildFaceVertices(Vector3 pos, BlockFaceDirection blockFaceDirection)
    {
        Vector3 topLeftFront = new Vector3(0f, 1f, 0f) + pos;
        Vector3 bottomLeftFront = new Vector3(0f, 0f, 0f) + pos;
        Vector3 topRightFront = new Vector3(1f, 1f, 0f) + pos;
        Vector3 bottomRightFront = new Vector3(1f, 0f, 0f) + pos;
        Vector3 topLeftBack = new Vector3(0f, 1f, -1f) + pos;
        Vector3 topRightBack = new Vector3(1f, 1f, -1f) + pos;
        Vector3 bottomLeftBack = new Vector3(0f, 0f, -1f) + pos;
        Vector3 bottomRightBack = new Vector3(1f, 0f, -1f) + pos;

        Vector2 topLeft = new Vector2(0.0f, 0.0f);
        Vector2 topRight = new Vector2(1.0f, 0.0f);
        Vector2 bottomLeft = new Vector2(0.0f, 1.0f);
        Vector2 bottomRight = new Vector2(1.0f, 1.0f);

        switch (blockFaceDirection)
        {
            case BlockFaceDirection.ZIncreasing:
                SolidVertices.Add(new VertexPositionTexture(topRightFront, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomLeft));
                SolidVertices.Add(new VertexPositionTexture(topRightFront, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomLeft));
                SolidVertices.Add(new VertexPositionTexture(topLeftFront, topLeft));
                break;
            case BlockFaceDirection.ZDecreasing:
                SolidVertices.Add(new VertexPositionTexture(topRightBack, topLeft));
                SolidVertices.Add(new VertexPositionTexture(topLeftBack, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomLeft));

                SolidVertices.Add(new VertexPositionTexture(topLeftBack, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomLeft));              
                break;
            case BlockFaceDirection.YIncreasing:
                SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
                SolidVertices.Add(new VertexPositionTexture(topRightFront, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(topLeftFront, bottomLeft));

                SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
                SolidVertices.Add(new VertexPositionTexture(topLeftFront, bottomLeft));
                SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));                 
                break;
            case BlockFaceDirection.YDecreasing:
                SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, topLeft));
                SolidVertices.Add(new VertexPositionTexture(bottomRightFront, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));

                SolidVertices.Add(new VertexPositionTexture(bottomRightFront, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
                break;
            case BlockFaceDirection.XIncreasing:
                SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomLeft));
                SolidVertices.Add(new VertexPositionTexture(topRightFront, topLeft));
                SolidVertices.Add(new VertexPositionTexture(topRightBack, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightBack, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(bottomRightFront, bottomLeft));
                break;
            case BlockFaceDirection.XDecreasing:
                SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
                SolidVertices.Add(new VertexPositionTexture(topLeftFront, topRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(topLeftBack, topLeft));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftFront, bottomRight));
                SolidVertices.Add(new VertexPositionTexture(bottomLeftBack, bottomLeft));
                break;

        }
    }'

此代码显示：s1100.photobucket.com/albums/g420/darestium/第一张图像是未绘制的面，后者是未绘制区域的侧面。

提前致谢， Darestium

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1 回答 1

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您的问题与所谓的背面剔除有关。我最近创建了与您正在做的类似的事情并遇到了同样的问题。解决方案很简单，但可能会很棘手，具体取决于您构建顶点的方式。解决方案：您必须按顺时针顺序构建索引。这意味着，如果您从要查看的一侧查看脸部，则该脸部的索引必须在数组中按顺时针顺序排列。您似乎没有包含构建索引的代码，只有顶点，但我会建议您构建顶点按顺时针顺序，然后简单地将您的索引列为 0、1、2（依此类推）。粗略查看您的 switch 语句，似乎“ZIncreasing”方向的顶点按顺时针顺序排列，但“ZDecreasing”从 TopRight 到 TopLeft 再到 BottomRight。如果您像我想象的那样从背面查看“ZDecreasing”面，那么我认为这是逆时针顺序，并且不会显示（或者，更确切地说，将绘制立方体那部分的内面，这对您不可见）。

如果在你的脑海中很难想到，只需制作一个小纸立方体并标记角落。创建顶点时，勾勒出角并确保它们按顺时针顺序排列。

于 2011-11-30T16:49:05.953 回答