1. 简介
在PC上开发时，其天空盒的效果很好，但是为
Android平台Build之后，其效果简直没法看。
更为恼火的是，之后PC上的纹理效果也变差了，新加入的纹理效果都会变差，看其纹理格式，使用ETC进行了压缩。
2. Unity3D默认纹理格式问题
2.1 在导入时是否自动压缩
Edit->Preferences...
当选择此选项之后，每当导入新的纹理（无论是拖入或在文件管理器中copy），
Unity3D都会根据当前平台的设置进行自动转换，此纹理转换，并不是把纹理文件进行修改，纹理文件是不动的，而是增加了一个.meta文件（如Sunny4_back.tif对应Sunny4_back.tif.meta），其中定义了很多与纹理相关的参数，其中决定此纹理格式的参数为：textureType，此文件内容如下：
[javascript]
view plain copyfileFormatVersion: 2
guid: e658bdd655d56c64eb2bf011d186cded
TextureImporter:
serializedVersion: 2
mipmaps:
mipMapMode: 0
enableMipMap: 1
linearTexture: 0
correctGamma: 0
fadeOut: 0
borderMipMap: 0
mipMapFadeDistanceStart: 1
mipMapFadeDistanceEnd: 3
bumpmap:
convertToNormalMap: 0
externalNormalMap: 0
heightScale: .25
normalMapFilter: 0
isReadable: 0
grayScaleToAlpha: 0
generateCubemap: 0
seamlessCubemap: 0
textureFormat: 4
maxTextureSize: 1024
textureSettings:
filterMode: -1
aniso: -1
mipBias: -1
wrapMode: -1
nPOTScale: 1
lightmap: 0
compressionQuality: 50
spriteMode: 0
spriteExtrude: 1
spriteMeshType: 1
alignment: 0
spritePivot: {x: .5, y: .5}
spriteBorder: {x: 0, y: 0, z: 0, w: 0}
spritePixelsToUnits: 100
alphaIsTransparency: 0
textureType: -1
buildTargetSettings: []
spriteSheet:
sprites: []
spritePackingTag:
userData:
2.2 Unity3D设置纹理格式
1) 选中纹理，纹理的Inspector窗口如下图所示：
上图显示的为Default设置，若Android平台没有单独设置， 则此纹理在Anroid平台采用默认设置，若Android平台单独设置了，则采用Android平台设置的格式。Unity3D只能设置三种纹理格式：Compressed、16bits、Truecolor，若要设置其它纹理格式，则Unity3D无能为力。
2.3 在Unity3D中自定义设置纹理格式
把ChangeTextureImportSettings.cs放于Assets/Editor目录下，ChangeTextureImportSettings.cs内容如下：
[javascript]
view plain copyusing UnityEngine;
using UnityEditor;
// /////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Batch Texture import settings modifier.
//
// Modifies all selected textures in the project window and applies the requested modification on the
// textures. Idea was to have the same choices for multiple files as you would have if you open the
// import settings of a single texture. Put this into Assets/Editor and once compiled by Unity you find
// the new functionality in Custom -> Texture. Enjoy! :-)
//
// Based on the great work of benblo in this thread:
// http://forum.unity3d.com/viewtopic.php?t=16079&start=0&postdays=0&postorder=asc&highlight=textureimporter
//
// Developed by Martin Schultz, Decane in August 2009
// e-mail: ms@decane.net
//
// Updated for Unity 3.0 by col000r in August 2010
// http://col000r.blogspot.com
//
// /////////////////////////////////////////////////////////////////////////////////////////////////////////
public class ChangeTextureImportSettingsUnity3 : ScriptableObject {
[MenuItem ("Custom/Texture/Change Texture Format/Auto Compressed")]
static void ChangeTextureFormat_AutoCompressed() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.AutomaticCompressed);
}
[MenuItem ("Custom/Texture/Change Texture Format/Auto 16bit")]
static void ChangeTextureFormat_Auto16Bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.Automatic16bit);
}
[MenuItem ("Custom/Texture/Change Texture Format/Auto Truecolor")]
static void ChangeTextureFormat_AutoTruecolor() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.AutomaticTruecolor);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGB Compressed DXT1")]
static void ChangeTextureFormat_RGB_DXT1() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.DXT1);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGB Compressed DXT5")]
static void ChangeTextureFormat_RGB_DXT5() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.DXT5);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGB 16 bit")]
static void ChangeTextureFormat_RGB_16bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.RGB16);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGB 24 bit")]
static void ChangeTextureFormat_RGB_24bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.RGB24);
}
[MenuItem ("Custom/Texture/Change Texture Format/Alpha 8 bit")]
static void ChangeTextureFormat_Alpha_8bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.Alpha8);
}
[MenuItem ("Custom/Texture/Change Texture Format/ARGB 16 bit")]
static void ChangeTextureFormat_RGBA_16bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.ARGB16);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGBA 32 bit")]
static void ChangeTextureFormat_RGBA_32bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.RGBA32);
}
[MenuItem ("Custom/Texture/Change Texture Format/ARGB 32 bit")]
static void ChangeTextureFormat_ARGB_32bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.ARGB32);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGB PVRTC 2bit")]
static void ChangeTextureFormat_RGB_PVRTC_2bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.PVRTC_RGB2);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGBA PVRTC 2bit")]
static void ChangeTextureFormat_RGBA_PVRTC_2bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.PVRTC_RGBA2);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGB PVRTC 4bit")]
static void ChangeTextureFormat_RGB_PVRTC_4bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.PVRTC_RGB4);
}
[MenuItem ("Custom/Texture/Change Texture Format/RGBA PVRTC 4bit")]
static void ChangeTextureFormat_RGBA_PVRTC_4bit() {
SelectedChangeTextureFormatSettings(TextureImporterFormat.PVRTC_RGBA4);
}
// ----------------------------------------------------------------------------
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/32")]
static void ChangeTextureSize_32() {
SelectedChangeMaxTextureSize(32);
}
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/64")]
static void ChangeTextureSize_64() {
SelectedChangeMaxTextureSize(64);
}
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/128")]
static void ChangeTextureSize_128() {
SelectedChangeMaxTextureSize(128);
}
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/256")]
static void ChangeTextureSize_256() {
SelectedChangeMaxTextureSize(256);
}
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/512")]
static void ChangeTextureSize_512() {
SelectedChangeMaxTextureSize(512);
}
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/1024")]
static void ChangeTextureSize_1024() {
SelectedChangeMaxTextureSize(1024);
}
[MenuItem ("Custom/Texture/Change Texture Size/Change Max Texture Size/2048")]
static void ChangeTextureSize_2048() {
SelectedChangeMaxTextureSize(2048);
}
// ----------------------------------------------------------------------------
[MenuItem ("Custom/Texture/Change MipMap/Enable MipMap")]
static void ChangeMipMap_On() {
SelectedChangeMimMap(true);
}
[MenuItem ("Custom/Texture/Change MipMap/Disable MipMap")]
static void ChangeMipMap_Off() {
SelectedChangeMimMap(false);
}
// ----------------------------------------------------------------------------
[MenuItem ("Custom/Texture/Change Non Power of 2/None")]
static void ChangeNPOT_None() {
SelectedChangeNonPowerOf2(TextureImporterNPOTScale.None);
}
[MenuItem ("Custom/Texture/Change Non Power of 2/ToNearest")]
static void ChangeNPOT_ToNearest() {
SelectedChangeNonPowerOf2(TextureImporterNPOTScale.ToNearest);
}
[MenuItem ("Custom/Texture/Change Non Power of 2/ToLarger")]
static void ChangeNPOT_ToLarger() {
SelectedChangeNonPowerOf2(TextureImporterNPOTScale.ToLarger);
}
[MenuItem ("Custom/Texture/Change Non Power of 2/ToSmaller")]
static void ChangeNPOT_ToSmaller() {
SelectedChangeNonPowerOf2(TextureImporterNPOTScale.ToSmaller);
}
// ----------------------------------------------------------------------------
[MenuItem ("Custom/Texture/Change Is Readable/Enable")]
static void ChangeIsReadable_Yes() {
SelectedChangeIsReadable(true);
}
[MenuItem ("Custom/Texture/Change Is Readable/Disable")]
static void ChangeIsReadable_No() {
SelectedChangeIsReadable(false);
} //Unity3D教程手册：www.unitymanual.com
// ----------------------------------------------------------------------------
static void SelectedChangeIsReadable(bool enabled) {
Object[] textures = GetSelectedTextures();
Selection.objects = new Object[0];
foreach (Texture2D texture in textures) {
string path = AssetDatabase.GetAssetPath(texture);
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
textureImporter.isReadable = enabled;
AssetDatabase.ImportAsset(path);
}
}
static void SelectedChangeNonPowerOf2(TextureImporterNPOTScale npot) {
Object[] textures = GetSelectedTextures();
Selection.objects = new Object[0];
foreach (Texture2D texture in textures) {
string path = AssetDatabase.GetAssetPath(texture);
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
textureImporter.npotScale = npot;
AssetDatabase.ImportAsset(path);
}
}
static void SelectedChangeMimMap(bool enabled) {
Object[] textures = GetSelectedTextures();
Selection.objects = new Object[0];
foreach (Texture2D texture in textures) {
string path = AssetDatabase.GetAssetPath(texture);
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
textureImporter.mipmapEnabled = enabled;
AssetDatabase.ImportAsset(path);
}
}
//Unity3D教程手册：www.unitymanual.com
static void SelectedChangeMaxTextureSize(int size) {
Object[] textures = GetSelectedTextures();
Selection.objects = new Object[0];
foreach (Texture2D texture in textures) {
string path = AssetDatabase.GetAssetPath(texture);
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
textureImporter.maxTextureSize = size;
AssetDatabase.ImportAsset(path);
}
}
static void SelectedChangeTextureFormatSettings(TextureImporterFormat newFormat) {
Object[] textures = GetSelectedTextures();
Selection.objects = new Object[0];
foreach (Texture2D texture in textures) {
string path = AssetDatabase.GetAssetPath(texture);
//Debug.Log("path: " + path);
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
textureImporter.textureFormat = newFormat;
AssetDatabase.ImportAsset(path);
}
}
static Object[] GetSelectedTextures()
{
return Selection.GetFiltered(typeof(Texture2D), SelectionMode.DeepAssets);
}
}
以上代码参考：
Unity3d：批量修改贴图导入设置工具脚本然后，Unity3D界面如下：
在Project窗口中选中需要设置的纹理（可多选），然后点菜单命令执行对应的转换即可。
