从纹理 2D 到立方体贴图答案

【问题标题】：from texture2D to cubemap从纹理 2D 到立方体贴图
【发布时间】：2020-04-26 14:45:02
【问题描述】：

我从从图库中挑选的图像创建了一个 texture2D 对象（我正在开发一个 android 应用程序）。我的 Resources 文件夹中有一个名为“main”的材质，它是 Skybox/Cubemap 材质。如果我想在我的脚本中设置材质纹理，我需要一个 Cubemap 纹理，而不是 Texture2D 纹理。所以，我的问题是：如何将我的 Texture2D 转换为 Cubemap？我发布了一段代码来更好地解释我的问题（我不知道在“//from mainImage to cubetex ??”部分写什么）。

 private Texture2D mainImage;
 private Cubemap cubetex = new Cubemap (2048, TextureFormat.RGB24, false);
 private Material mat;

 mainImage = new Texture2D (www.texture.width, www.texture.height);
 mainImage.SetPixels32 (www.texture.GetPixels32());
 mainImage.Apply ();

 // from mainImage to cubetex ?????

 mat = Resources.Load("main") as Material;
 mat.SetTexture ("_Tex", cubetex);

【问题讨论】：

标签： unity3d textures texture2d

【解决方案1】：

以下是我用来在立方体的每一侧放置不同图像的代码。它需要一个带有一组图像的 Texture2d。

    atlas = new Texture2D(512, 512);
    atlasUVs = atlas.PackTextures(atlasTextures, 1, 512);

    GetComponent<Renderer>().material.mainTexture = atlas;

    mesh = GetComponent<MeshFilter>().mesh;
    originalUVs = new Vector2[mesh.vertices.Length];

    // Front
    originalUVs[0] = new Vector2(atlasUVs[0].xMin, atlasUVs[0].yMin);
    originalUVs[1] = new Vector2(atlasUVs[0].xMax, atlasUVs[0].yMin);
    originalUVs[2] = new Vector2(atlasUVs[0].xMin, atlasUVs[0].yMax);
    originalUVs[3] = new Vector2(atlasUVs[0].xMax, atlasUVs[0].yMax);
    // Top
    originalUVs[4] = new Vector2(atlasUVs[1].xMin, atlasUVs[1].yMax);
    originalUVs[5] = new Vector2(atlasUVs[1].xMax, atlasUVs[1].yMax);
    originalUVs[8] = new Vector2(atlasUVs[1].xMin, atlasUVs[1].yMin);
    originalUVs[9] = new Vector2(atlasUVs[1].xMax, atlasUVs[1].yMin);
    // Back
    originalUVs[6] = new Vector2(atlasUVs[2].xMax, atlasUVs[2].yMin);
    originalUVs[7] = new Vector2(atlasUVs[2].xMin, atlasUVs[2].yMin);
    originalUVs[10] = new Vector2(atlasUVs[2].xMax, atlasUVs[2].yMax);
    originalUVs[11] = new Vector2(atlasUVs[2].xMin, atlasUVs[2].yMax);
    // Bottom
    originalUVs[12] = new Vector2(atlasUVs[3].xMin, atlasUVs[3].yMin);
    originalUVs[13] = new Vector2(atlasUVs[3].xMin, atlasUVs[3].yMax);
    originalUVs[14] = new Vector2(atlasUVs[3].xMax, atlasUVs[3].yMax);
    originalUVs[15] = new Vector2(atlasUVs[3].xMax, atlasUVs[3].yMin);
    // Left
    originalUVs[16] = new Vector2(atlasUVs[4].xMin, atlasUVs[4].yMin);
    originalUVs[17] = new Vector2(atlasUVs[4].xMin, atlasUVs[4].yMax);
    originalUVs[18] = new Vector2(atlasUVs[4].xMax, atlasUVs[4].yMax);
    originalUVs[19] = new Vector2(atlasUVs[4].xMax, atlasUVs[4].yMin);
    // Right        
    originalUVs[20] = new Vector2(atlasUVs[5].xMin, atlasUVs[5].yMin);
    originalUVs[21] = new Vector2(atlasUVs[5].xMin, atlasUVs[5].yMax);
    originalUVs[22] = new Vector2(atlasUVs[5].xMax, atlasUVs[5].yMax);
    originalUVs[23] = new Vector2(atlasUVs[5].xMax, atlasUVs[5].yMin);
    mesh.uv = originalUVs;

这是它所基于的链接：

http://answers.unity3d.com/questions/542787/change-texture-of-cube-sides.html

【讨论】：