如何为纹理边界设置 UV答案

【问题标题】：How to set up UVs for Texture borders如何为纹理边界设置 UV
【发布时间】：2013-05-08 23:52:27
【问题描述】：

我正在生成一个能够缩放的平面，而纹理的边缘不会受到像素方面的影响。飞机需要能够保持其边界比例，但能够伸展到几乎任何尺寸。网格有 8 个顶点和 10 个三角形来构成边界。无论如何，这就是我得到的。忽略网格几何体上的数字。

是否可以编辑 UV 以获得所需的结果？这是代码：

Mesh mesh = new Mesh();
    var renderer = mesh.AddRenderer();


    //create verticies

    mesh.vertices = new Vector3[] {

        //vertices in order for convienience 
        Manager.GUI.ScreenToWorldPoint(new Vector3(0f,0f,0f)),                            //0
        Manager.GUI.ScreenToWorldPoint(new Vector3(padding,padding,0)),                   //1
        Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, padding,0f)),         //2
        Manager.GUI.ScreenToWorldPoint(new Vector3(width,0f,0f)),                         //3
        Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, height - padding,0f)),//4
        Manager.GUI.ScreenToWorldPoint(new Vector3(width,height,0f)),                     //5
        Manager.GUI.ScreenToWorldPoint(new Vector3(padding, height - padding, 0f)),       //6
        Manager.GUI.ScreenToWorldPoint(new Vector3(0f,height,0f)),                        //7
    };



    //create triangles
    mesh.triangles = new int[] {
        7,5,6,
        6,5,4,
        4,5,3,
        2,4,3,
        0,2,3,
        0,1,2,
        0,7,6,
        0,6,1,
        1,6,4,
        1,4,2
};

    //create UV's uvs are in order of creation for convienience
       mesh.uv = new Vector2[] {
           new Vector2(0f,0f),
           new Vector2(padding/width, padding/height),
           new Vector2((width-padding)/width, padding/height),
           new Vector2(1f,0f),
           new Vector2((width - padding)/width,(height-padding)/height),
           new Vector2(1f,1f),
           new Vector2(padding/width,(height-padding)/height),
           new Vector2(0f,1f)





    };



    mesh.calculateNormals();
    mesh.calculateBounds();
    renderer.Texture = mytex;
    return plane;
}

填充是纹理周围定义的忽略缩放的像素，而高度和宽度是形状的尺寸。

【问题讨论】：

不，不是，它总是会被拉长。您需要为顶部、底部、左侧、右侧和每个角设置单独的四边形。
@George 所以我需要生成 9 架飞机？还是我需要修改几何形状，使其中有 9 个四边形（或 18 个三角形）？无论哪种情况，我设置紫外线的方式都会给我想要的结果吗？同样对于tris，索引模式是否会是这样的（从上到下，从左到右“，”代表下一行）13 11 10 9, 14 12 8 7, 15 2 4 6, 0 1 3 5
会有 9 个四边形，所以总共 9 * 2 = 18 个三角形。由于您正在更改几何体，因此您需要更改 UV，您可能会发现最简单的方法是让 4 个直边（因为它们相同，但经过旋转）和角落（因为所有 4角是相同的，旋转的。）。
您是否使用像素着色器来渲染三角形？如果你这样做，我可能会为你提供更好的答案。
我假设你不能，那么？

标签： c# .net image mesh uv-mapping

【解决方案1】：

正如 George 所说，我生成的网格使得无法在没有趣味的情况下缩放图像。修复网格必须重新制作成可以工作的东西。现在是代码

Mesh mesh = new Mesh();
    var renderer = mesh.AddRenderer();
         mesh.vertices = new Vector3[] {

                //vertices in order for convienience  
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,0f,0f)),                            //0
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding,0f,0f)),                      //1
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding,padding,0)),                   //2
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, 0f,0f)),              //3
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, padding,0f)),         //4
                Manager.GUI.ScreenToWorldPoint(new Vector3(width,0f,0f)),                         //5
                Manager.GUI.ScreenToWorldPoint(new Vector3(width,padding,0f)),                    //6
                Manager.GUI.ScreenToWorldPoint(new Vector3(width , height - padding,0f)),         //7
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding, height - padding,0f)),//8
                Manager.GUI.ScreenToWorldPoint(new Vector3(width,height,0f)),                     //9
                Manager.GUI.ScreenToWorldPoint(new Vector3(width - padding,height,0f)),           //10
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding, height, 0f)),                 //11
                Manager.GUI.ScreenToWorldPoint(new Vector3(padding, height - padding, 0f)),       //12
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,height,0f)),                        //13
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,height - padding,0f)),              //14
                Manager.GUI.ScreenToWorldPoint(new Vector3(0f,padding,0f)),                       //15
            };



            //create triangles
            mesh.triangles = new int[] {
                15,2,0,
                1,0,2,
                1,2,4,
                1,4,3,
                3,4,6,
                3,6,5,
                4,8,7,
                4,7,6,
                8,10,9,
                8,9,7,
                12,10,8,
                12,11,10,
                14,11,12,
                14,13,11,
                15,14,12,
                15,12,2,
                2,12,8,
                2,8,4

    };

            //create UV's uvs are in order of creation for convienience
               mesh.uv = new Vector2[] {
                   new Vector2(0f,0f),   //0
                   new Vector2(padding / width, 0f), //1
                   new Vector2(padding/width, padding/height), //2
                   new Vector2((width-padding)/width, 0f), //3
                   new Vector2((width-padding)/width, padding/height), //4
                   new Vector2(1f,0f), //5
                   new Vector2(1f,padding / height), //6
                    new Vector2(1f, (height - padding) / height), //7
                   new Vector2((width - padding)/width,(height-padding)/height),//8
                   new Vector2(1f,1f), //9
                    new Vector2((width -padding)/width,1f), //10
                    new Vector2(padding/width,1f), //11
                   new Vector2(padding/width,(height-padding)/height), //12
                   new Vector2(0f,1f), //13
                   new Vector2(0f,(height - padding) / height), //14
                   new Vector2(0f,padding / height) //15





            };



            mesh.RecalculateNormals();
            mesh.RecalculateBounds();

            return plane;

希望它可以帮助其他程序员

【讨论】：