How do I change the compression format of all my texture atlases?

Question

I am trying to change the compression of all my texture atlases to PVRTC_RGBA4 so that I don't have to do them one by one. Here is my code:

                 if( !file.EndsWith( ".meta" ) )
                 {
                     string path = "Assets/Resources/Bundles/" + Path.GetFileName(bundle) + "/Atlases/" + Path.GetFileName(file);
                     tex2D = (Texture2D)Resources.LoadAssetAtPath( path, typeof(Texture2D) );
                     PostprocessTexture( tex2D );
                 }

I get no errors and it pops out what I expect from the last Debug.Log, but it doesn't actually seem to do the compression when I look at the atlas in the inspector. I have also tried using AssetDatabase instead of Resources but that didn't seem to do much of anything.

What am I doing wrong? Or what am I missing?

Answer 1

I figured out my own question. I should have been reimporting the image instead of trying to change the compression on the file. Here is my updated code:

                 if( file.EndsWith( ".png" ) || file.EndsWith( ".tga" ) )
                 {
                     string path = "Assets/Resources/Bundles/" + Path.GetFileName(bundle) + "/Atlases/" + Path.GetFileName(file);
                     tex2D = (Texture2D)AssetDatabase.LoadAssetAtPath( path, typeof(Texture2D) );
                     TextureImporter importer = ( TextureImporter ) TextureImporter.GetAtPath ( path );
                     importer.textureType     = TextureImporterType.Advanced;
                     importer.npotScale         = TextureImporterNPOTScale.None;
                     importer.textureFormat     = TextureImporterFormat.PVRTC_RGBA4;
                     importer.wrapMode        = TextureWrapMode.Clamp;
                     importer.isReadable     = true;
                     importer.mipmapEnabled     = false;
                     importer.maxTextureSize = 4096;
                     
                     AssetDatabase.ImportAsset( path );
                 }

Answer 2

Answer by NeverTrustShadows · Oct 26, 2021 at 01:50 PM

This is no longer valid form of update. Most of the properties are obsolete.

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How do I change the compression format of all my texture atlases?

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